Video Timeline: 1:18 - THX Standard 4:15 - The Big Question! 5:05 - My Methodology 7:45 - My Recommendation 11:40 - The Wrap Up!

I am just getting back into home theater, and this video and others on your channel have helped tremendously. Thanks.

When THX came up with the 80Hz standard it was over 25 years ago. Speakers have improved dramatically since then. Test and listen for yourself to see what’s best for your system and don’t forget the Surrounds.

Man, after daaaaays of trying to figure out why the sound was so crappy on my new Wharfdale towers, I came across your video and made the settings make so much more sense! All of a sudden I can hear details again! Thank you!!!!

Just wanted to say thank you for the tips in this video. I adjusted my crossovers and it made a world of difference. You were definitely correct. I did get a much fuller and even sounding bass from my speakers, especially with fronts. Please keep making videos. I thoroughly enjoy your channel.

This is really an issue that never seems to go away. Unfortunately many people, myself included fell into the trap of using the recommended 80 hz crossover for all the speakers. I didn't know much about speaker frequency response capability except it was an number in the speaker specs. Like many I purchased speakers based on recommendations from friends and reading reviews; ditto receivers. Needless to say I've wasted a lot of money. Since watching you guys on your daily podcast I have become more knowledgeable. I subscribed to your channel and came across this video. It was truly a great find. My system which consists of ML 60xts, 50xt and FX surrounds with a Polk 10 inch Sub with the FL, FR , FC set to 60 Hz and the FXs left at 80hz has really opened up the sound to the point I sat in amazement when playing my favorite go to CD which is the 1812 Overture on Mercury Living Presence with all the bells, cannon shots, etc. and the Hobbit - Battle of Five Armies movie. BTW my AVR is the Marantz SR7013 with the Emotiva BASX 2 driving the FCR speakers leaving the sub and surrounds to the Marantz (which really had a problem driving the ML 60xts despite what their specs said, that is another story). This is a long post but thank you. Perhaps this is a topic you guys should revisit on your daily podcasts.

Every video of yours is detailed and of professional level. Your way of mixing humour with the facts, is what makes the viewers keen on listening to you, without making them bored. I appreciate your efforts. Thanks and keep going.

I agree 100%. For my Klipsch 8000F's I have two crossover presets on my Yamaha Aventage Receiver, one for movies @ 60hz, and one for music at @ 40hz. After listening for quite some time I have settled on these settings and could not be happier.

Always learn something new from TD's channel because he knows what he's talking about! I like that. Great!! 👍

I think you're 100% correct that it's all subjective and everyone's room is going to sound different. The size of the room, placement of the speakers, and listening distance are all factors that contribute to how the sound is going to change in any given situation. Tweaking to find what sounds best in your room is part of the enjoyment of the hobby (IMHO).

I love experimenting with the crossovers, I run 11.2.2 including a 4-way B&W HTM centre, and 12" tower mains, 10"&15" subwoofers, 6.5" everywhere else. I have the 15" sealed velodyne set around 40hz, it moves a lot of air that you feel on your pants its such a nice boost in extension into the sub frequencies. My 10" audio research is ported so its got a punch in the higher 80hz area and i have it set to 90hz. The mains and heights set to large 40hz highpass they sweeten everything at a flat but very full response throughout the entire frequency sweep. the centre although 4-way doesnt have much bass output lower than around 100hz despite its size, its set to 100. Then i have the crossover for the Low frequency extension setting that sends subwoofer signal to the mains as well as the subwoofer, its set to 150hz which seems to sound better.giving all the bass to the mains as well.

I've been enjoying my Klipsch RF 820s with my SVS SB 4000. Watched over 50 4k movies. Finally got around to using REW. Found I had a big dip at 42 hz despite the great bass. Had to adjust one of the DSP and put it out of phase. Now I'm in heaven all over again 😁

Thanks TD appreciate you always doing the groundwork and making it so simplistic to understand.

I like your video! It's refreshing to hear advice telling people to to try out different settings to see what sounds best for their unique setup, rather than pretending to know something specific about something with so many variables. I loved how you described your process, particularly how you explained why you chose the test clip that you did. Great information. My 5.2.4 Atmos setup in the family room is set at 80Hz because it sounds best with my Boston HS-40 surrounds and height speakers. My 5.1 in the man cave, however, is set at 60Hz because it sounds fuller with my Infinity Sterling SS-03 speakers. The right crossover point really does depend upon speaker size and placement, and room size and acoustics. New fan of your channel! Thank you!

I've seen a fair amount of your videos and after this one, I have a greater appreciation for you T.D. Keep on, keeping on.

It's refreshing to see a video keeping an open mind about crossovers and not just saying "Set crossover on all your speakers to 80Hz. Period." like so many out there. Especially when it comes to the center channel.

i can't believe that there's any dislikes, i mean come on guys. This guy is the real deal and knows what he's talking about.

Glad I found this video, cause I’ve been kind of scratching my head about this very topic. Great review!!

Great topic and video. That’s always something I am experimenting with . You bring up some valid points and something I will try.

Totally agree with you on this. The Audyssey XT32 does it all for you and more e.g. crossovers, channel levels, time delays and EQs and phasings.

Great work covering the home theater basics. Great pertinent information, always helpful! Great work on this video.

I have the Klipsch R-26F, and I used the John Wick club scene as my demo as well. I believe I landed at 60hz for these speakers. I had the towers set to large for months, but after making this change I notice a huge difference in quality.

Great Video! I leave all my settings at 80hz/Atmos at 100hz plus lfe at 120hz dual 12" DB12 subs & sounds perfect for me, all depends on what you like & what equipment you are using. My Fluance Signature series towers going down at 35hz. 2.0 for music i change to full band without the dual subs.

do you unplug all the other speakers except sub and the particular one to test for finding the right frequency?

Channa, thank you very much i purchased the rf7 iii and rc64 due to you and youthman. Can you give me an up to date crossover starting point from your experience yhat i can set my front stage at. I would appreciate that. Thanks again. Also small or large for the rf7 iii and rc-64 iii

Love your videos man! Thanks! That's helps me a lot!!

Very solid advice brother... Ive seen all the recommended 80/120 recommendations and tested myself..all I can say is its not only subjective but will vary from system to system as well... 80 and 120 may sound great on one system and not right on another..also music listening vs hometheater setup may require straying from those parameters..Truly, you need to do what you have done: try the settings and then vary things within the parameters set by ur speakers capabilities and try a varity of listening, then see what complements the sound and what degrades the sound... one rule fits all does not really work, its a starting point, you dial in from there.

Even in the Subwoofer range, as frequency goes up, the beams or directionality of the speaker becomes more directional. At lower frequencies, sound tends to sound Omni-Directional or all directional. At above 80hz, the bass sound starts to become more directional. That is, instead of coming from everywhere, it seems to be coming from a specific direction. Now this is a steady process, the higher the frequency, the more you can determine the direction the sound is coming from. Under 80hz, the sound tends to be coming from everywhere which is what you want for Sub-Bass for Movies, and even for Music.

Thanks Channa great video. I looked at several and thought your recommendations rounded off everything I had looked at and read. I have a Pioneer SP-52KFS system. I’m thinking about about upgrading to either elac, svs, or klipsch but that’s beside the point. So on the spec sheet the towers bottom out at 40 Hz center and surrounds 55 Hz, atmos-enabled at 180 Hz. So I raised everything up by 10 hz 50 hz and 70 hz respectively. Subwoofers set 120 hz and atmos-enabled speakers (180 hz) I left at the auto-calibration level of 150 hz. I’ll listen to these settings for a week or so and see if I like ‘em.

Great info. Hope you'll do a video about Atmos speakers regarding this. Thanks.

Just watched and great review . Got a question . I have the Q Acoustics 3050i floorstanding speakers and the Q Acoustics 3090ci centre speaker with two svs sb1000 subs and 4 svs prime Elevation speakers two for Heights and the other two for rears all set at 80hz would you suggest setting the fronts to 50hz and the centre to 70hz and what would suggestion be for the Heights and rears . Many Thanks . Wedge .

When we adjust crossover accordingly, is there a point to set the avr for either small or large speakers? Audioholics recommends to set the 3 main speakers to small in a HT set-up.

Thanks for sharing your knowledge., I enjoy your show and have learned plenty. I hear you when you say it is subjective and I understand why I should probably set all my speakers to small and the receiver crossover point to 80HZ but... when I use YPAO mic to setup my Yamaha RX V473 receiver YPAO changes all the speakers (except the center channel) from small back to large and crossover back from 80 to 120 or sometimes right up to 160HZ The Yammy receiver is connected to Onkyo SKF-4800 floor-standing front speakers, Onkyo SKC-4800 center speaker, Infinity reference 5.5'' bookshelf rear speakers on stands and Sony SA-WM40 subwoofer. I mainly listen to rock and country music and stream the occasional movie or tv series. I struggle to get my head around frequency numbers ans I know is subjective, but without hearing it do you think I should probably still change all the speakers back to small and crossover to 80??? Thanks again, keep up the good work.

I just subscribed thank you. The video was def helpful I've been having this discussion with my friends for long time. Wish I had seen this video awhile ago. I have tower 1

Great video. This is a hard subject only because of he amount of variables, I'd say 80 has always been a good reference point for most in a surround system, in years past A/V receivers had somewhat limited bass management options, today things are different at the mid to high end level. One of the factors in a lot of the systems i have setup over the years that use clients legacy towers speakers is the power output of the A/V receiver. If a client had big fairly inefficient towers, lowering the crossover point and adding bass would definitely sap the power from the receiver on surround playback effecting the overall sound of the system, not so much an issue with speakers like Klipsch that are crazy efficient, but speakers that were in the low 80db range power hogs. In my system, my towers run full range in both two channel and surround, they are efficient and have powerful outboard amps pushing them with tons of headroom, but If I had a mid level A/V receiver (Like most people do)I would probably experiment just as you suggested...as you know, manufactures specs can be a little inflated from time to time :-) Anyway not trolling at all, I am an AV pro in my day job and former DJ myself, your info is sound, it's just that there are a ton of factors involved in this people may not consider and you could make a two our video on this...bust only audio nerds like us would watch. Good job brother.

Hey Techno dad. In the specs for the RP- 8000fs are the same as the low end Hz as the Rf 73s. If I'm not mistsken, your RP -820fs are the same. The RF-73s are for a bigger air space in a bigger room, that's why the 10" drivers to move more air so to speak. Am i correct?

Hey man! Keeping with my budget system, I'm got some price appropriate speakers to mount to the ceiling. polk audio owm3, going to do top middle with the Denon 3400. Frequently response goes down to 80, what would you suggest I set the crossover to? Do you do 80 on your Prime elevation? Thanks man

Thank you for the information. What I got out of this video we need towho what are our speakers frequency can handle also. Larger or tower speakers. I have Bose 601 series 1 speakers for my front. They are very big and very old. Would I consider those tower or large speakers?

Hey Channa, it's amazing sometimes how we all just go with the flow of recommended settings...i did, and my Paradigm front end for sure goes down to around 40Hz, so i too might have a muck around with some settings, and see what transpires...Cheers brother!👍

Hi, I have a Yamaha rx 685 reciever, and after the auto calibration my speakers are set to 40 hz, should I leave them like that? My speakers are bookshelf . Thank you!

I usually follow SVS's guideline of double what your speaker is rated {eg. 40Hz rating set to 80 75Hz set to 150} Seems to be a good starting point then get closer to actual rating of speakers.

What are your thoughts on theblower crossover, even on towers that go down to 30hz, reducing thebfidelitt of the higher end and mid? Some say that putting the load of the lower hz on the woofers will push them and reduce the fidelity of the other frequencies. Thoughts?

You never disappoint bro! Big ups to you.🙌🙌🙌🙌

Hey man, can you make a video elaborating about having two subwoofers / dual / stereo subwoofer? Thanks

My speakers are 8” Polk in ceiling and an in ceiling center channel. I found I had to raise crossover to 100 or 120 to correct muffle sound. Should I start over and do something different to make the crossover closer to 80?

Thanks for the tips! I'm definitely going to adjust my L/R and C channel tonight. I'm running a Denon AVR-X6500H along with a full Martin Logan setup (Motion 40's as my L/R and Motion 50XT as my C).

FYI, I've disconnected my subs from the floor with shock platforms usually used for say, monitors or guitar amps on risers. This allows them to move a bit and direct more sound into the listening area, and less into the carpeted floor. Huge difference after tuning!!

If the SVS Bookshelfs get down to 45HZ, can I set the crossover @ 60HZ?

What crossover would you recommend for Def Tech Pro Cinema 600 series speakers? They say 120hz is the recommend crossover, but I'm wondering what would happen if i set it at 80hz or 100hz? I'm rolling with dual PB-2000's for my subs. Thanks!

You can certainly get thru to people with you tutorial SIMPLE to understand and for that I THANK YOU WELL DONE

Nice video! Answered all my questions... Thank you!

What do you do if your receiver only lets you adjust one LFE frequency, rather than separate each channel? For instance, if your front LR is at 36hz, but your surround LR are set at 61hz, would you set it at the highest hz all of your speakers can handle, or would you set your front LR to Large size to have the full sound come through without the sub woofer LFE kick in. Any advice would be greatly appreciated!

Hey great videos, I recently got into home theater and have been watching your videos a lot and they have helped out immensely. Since I got my home theater a couple weeks ago I have had all my speakers set to large but now it's time to set crossover frequencies. So today I set them all to small and set frequencies to 80Hz on all except my atmos height speakers I set to 110Hz. Now I want to dial them into proper frequencies but I need some help. My towers are Soundstage Atmosphere T5's with a frequency range of 41-28 KHz. Setting these to 80 seems wrong but I am really new to this. What would be a good frequency to set these at? Any help on this subject would be greatly appreciated

Your the man techno dad I tried it on my polk tower speakers which can go down to 40 Hz set my ROTEL processor mains to 60 Hz and left my center and surrounds at 80Hz and set subwoofer at 120Hz and made a big difference to bass performance over the recommended ROTEL default settings which was 100Hz.

So I just now ordered some Klipsch r620f floor speakers they have two six inch drivers so what would you recommend as a good crossover for them. I pick them up today they are my first towers

In-room extension is always lower than the speaker's natural rolloff. I have found that in most rooms, given the typical slope of crossovers, your best setting will be a half-octave above the spec'd -3dB rolloff. So multiply the speaker's -3dB point by 1.5 and you will usually nail it, barring phase alignment issues.

Thanks Techno Dad this vid really helped me understand about crossovers so many thanks and keep on going

Great info. I had originally bought the Onkyo tz-nr630, but ended up having hdmi problems losing sound when ever it felt like it. Loved it when it worked properly. I could adjust the crossovers at 10hz at a time for the ear level speakers. I ended up returning it for the Denon x4500h, which is even better. The only issue i have with the Denon is i can't adjust the crossovers for the ear level speakers at 10hz at a time so i can dial it in better. With the Onkyo i had my center channel at 70hz. It's 20 hz at a time. Man, i wish i could get that down to 70, lol.

I understand what you're saying about crossover settings in your video. There's one part of surround sound setup that most people repeatedly skip over I noticed. Where do you set the bass level in the main speakers in a surround sound setup? Do you run it flat or dial it down?

Great video; question, when having large towers as front speakers like the Rf-7's or other, does it also make sense to put the speakers at large instead of tweaking the crossover? Again I haven't tried any if this yet, but I wanted your input on this. Tks for reading

Great explanations I’m considering buying the mono price monolith 3 Channel LCR in wall speakers. I can’t decide between the ones that have 4 woofers versus 2 woofers. I’m setting up a home theater - 3800 cubic feet. I have two RSL sub woofers. Do I need the extra woofers in the LCRs

Hey i changed my Klipsch RP 280f to Large which made a big difference in my sound, my music is much fuller. I had to lower my sub levels but i LOVE the change. Great video Thank you.

Solid video with some really great and useful advice. Im teally digging the channel bra.

THIS WAY ONLY ONE SPEAK WHO IS COMPETENT AND TRUE TO HIS WORDS OF KNOWLEDGE, ABSOLUTELY AWESOME TUTORIAL, LIKED THE WAY YOU SLAPPED UR CRITICS😁KEEP UP THE GOOD WORK MATE!! 👍👍

I got a nakamichi elite7.2 but they said on led in fornt 180 hz thats how works i dont know about that can someone explain me ? Its the same with a soundbar ?

the spec of hz you mentioned is the lowest and highest (+/- 3db) frequency per 1 metter distance MLP, how to actually be sure if the crossover is correct if the distance MLP is 2 or 3 metters?

Thanks for this, having never owned a sub before I had it set on the 80hz I saw recommended everywhere but when watching movies it was just overpowering and boomy, lowered it to 70hz and things sounded better. I'll continue adjusting things as I go to see what works best.

Always good at a change point new subs ! Wow cheers trying to dial these little monsters in

I guess I did it right by accident. I listened to it and made the changes. Thanks for the conformation. With my subwoofer I have found that if it is set up to higher frequency 140Hz+ it gets better low end and more pull on the woofer for lower base response without distortion. Is this correct?

When we listen to Av music (pure direct) the settings in the crossover "affect"?I mean does it matter when we listen to pure direct or only in movies for crossovers?

Is there a minimum setting above the speakers lower rating that is recommended to set the sub-woofers crossover? Thank you.

Thanks for the video. After 20 years I had to replace my receiver. I got at Onkyo & have Bose speaker set up. My previous receiver didn’t have this cross over stuff. Should I set ALL speakers at 80hz crossover? Or the LFE at 80 & the F S C at 100?? Please help.

I just ordered the Definitely technology Cs9080 Center Speaker, That Center Speaker is know for its 8" built in subwoofer, But I already have 2 Svs Subwoofers, Should I run the CS 9080 Center Speaker Small or Large to take advantage of the Subwoofer?

Thanks for the educational video. Here is a quick question regarding the "cut off at the legs" argument for the tower speakers that go down to 32 Hz. Couldn't one make the same argument for the sub? In other words, if my sub goes up to 150 Hz, why cut it off at the legs by setting the crossover all the way down at 60 Hz? Why not set my crossover to 100 Hz, and let my powered sub handle more of the bass that it is specifically designed to handle, which also frees up my receiver's power to focus more on the mid and high range frequencies handled by my front main speakers? Thank in advance if you respond.

so techno dad, cuz i dont know anything, wat do u recommend? so for klipsch speakers, bookshelf main, tower main, and for the sub? cuz i cnt rily rely on wat i hear cuz i dont know wat i shud hear or i will try to make adjustments but i wud like to know wat ur settings r for my basis

I just watched this video. Have a Klipsch RP4000F and RP404C paired with the SPL100 sub. Would crossover at 60 be better for both towers and center or 60 for the towers and 80 for the center? Should I leave the LFE at 120 or reduce it to 100 or 80? I’m new to this and would like to seek your help and thoughts! Thank you!

I've experienced the same thing. Moderate home theater setup with a Sony Atmos receiver, and full Energy Connoisseur setup. LRC are CC-10's, LH & RH are CB-10's, LR RR are CB-20's and there's 3 CSW-C8 subs. All the main speakers are 60-20k, and 92db. I've tried all sorts of crossover points, and it sounds really nice at the THX 80hz, but I've got them all set at 70hz and 0db which surprisingly makes a considerable difference and the whole system sounds richer and fuller with certain effects and music that are being played in surround that would otherwise be subdued. The subs are at -5 but they've got a 97db efficiency, and I have effect/eq set to off and it all sounds pretty sweet regardless if it's a new Atmos movie, an old 5.1, or even stereo. Thanks for the video!

I was really impressed when you said 'john wick is here' your point was made clearly sir.

I love your videos they are very informative regarding the point on floorstanders or any other speaker really they will only handle what they will handle crossover frequencies I agree or different but on the point with floor standards what I do I select full band to get the best full power out of the actual speaker and then I also select double bass on subwoofer settings to underpin if I ever needed to but I have to be honest in 25 years I've never used a subwoofer if your speakers can handle it and are good quality they will deliver the chance that I've experienced is people don't know how to use subwoofers they are obsessed with bass and putting base or trying to put base there when it isn't even on the soundtrack and it all comes back to the same thing if it isn't on the recording you will be whistling Dixie forever more brilliant video Our Kid love from the UK Oh yeah even on surround backs I can't really tell the difference but if you have to mess around with crossover frequencies and then maybe there would be applied but I never do all my speakers are on full band and all I can tell you is I'm surprised my plaster and windows are still in place and it isn't the most powerful system either I use on Onkyo TX nr609 from nearly 10 years ago it is not at Moss but still sounds absolutely freaking amazing even on music I think people need to pare the speakers more carefully preferably the same make on all speaker all around that way you get a full balance and you get a good cohesion of speakers but everybody is different again mate a great video love from the UK I shall leave you alone now

i agree with you views on crossovers there's a disc delos de 3179 which has a 20,000 to 15 hz test to see where your main speakers rolloff hope this helps good video

i bought an onkyo txnr686 i got the set up done and started playing the movie fast seven on bluray as it was playing i noticed that the sound cuts off on some scenes, is that the movie? the receiver does not flicker in any way at all, i have it playing it on sony x700 do you think is my player? anything would help thank you..

You are so cool. You are so helpful and I always learn so much from you. Keep doing what you’re doing bro.

so I just did a sound check with the wee mic and I set its self to 200hz ? should I put it to 80 hz or is it just that I have a cheep set up thank you my speakers are 15 to 100w .

Thank you Channa. I have this setup and would like/appreciate your opinion. RF-7IIIs, RC-64III, 4 RP-600M & 4 CDT5800s and a JTR 4000 sub. All running off a Marantz 8015. Right now I have everything crossed to the sub at 120Hz. Your thoughts?

Thanks for sharing. I have a question i hook up a mixer for karaoke to a receiver so should the mixer and receiver be set at the same cross over frequency? Usually I set my mixer at 80hz and then 70hz for the receiver to crossover to front speakers and sub but I don’t know if that is the correct connection or not. Please help. Thanks very much

setting speaker small or large opitions and my settings can't be set lower then 80 hz?

It makes sense to let the sub handle bass. A proper sub will take the stress off small satellites and do it better.

Excellent video bro. I like your videos. Bro please let me know, I am using the subwoofer SVS PB 12 NSD and really can't decide to set the crossover. Shall I set it up to 120 hz or below that. My amp is Onkyo tx nr 686. Would really appreciate to have your advise and answer on this ASAP.

Hey TD, I have a Denon 4308ci running a 6.1 Infinity beta 50 TOWERS set @ 60 hz Infinity 360 center set @ 80hz Klipsch 12" down firing set @120hz Rears are KLIPSCH R-51 bookshelf set @ 90 Think it's ok!?

excellent video ...what do you recommend crossover and level Home theater 7.2.2 AVR Marantz 7012 Bluray 4k panasonic DP ub820 Front klipsch RF-42II Center RP 504C Subwoofer klipsch R-110SW Subwoofer SVS PB 1000 Surround and surround back RB-41 II Dolby Atmos Rp 140SA living Room size 13 x 31 (403 sq feet)

decent klipsch center for bedroom - sat 6.5 feet away? would the rp 404c be way to big? either their reference or reference premiere would be fine and pairing with their smallest bookshelf speakers (rp400 or r 41) room is also 4m length x 4m width and 2.5m depth

On my caseI have SVS pinnacles tower speakers and svs prime center and two SVS prime bookshelf speakers with two SVS prime satellites with prime elevation speakers, what should my cross over setting should be?. Thanks

Which Power amplifier is suitable for Onkyo Tx-Rz 830? 9.2 chanels Thanks.

Nice and helpful info. Thanks bro.

I had my sub at 80 along with my speakers. I experimented a bit with it at lfe but the localization ruined it for me. I split the difference at 100 hz and it's amazing. Just trust your ears. Running: Yamaha aventage 3080 Klipsch 280fs Klipsch 240s Klipsch 440c Klipsch r 115sw Going to now start experimenting my front stage. Good call.

I have the Polk S15 bookshelf speakers mounted on the wall beside the TV and Pold S10 speakers as my surround back speakers. I also have the S35 Polk center speaker and have a Klipsch 12" sub. What would you set the crossovers for on all the speakers and also the sub? Thanks, Scott

Some questions about this subject: will thx certified receivers automatically calibrate to 80? Will I put less strain on my receiver if I crossover at a higher frequency? (Allow speakers to play louder)

I have Polk audio rm7-8 with frequency response 130-20,000 Hz (-3dB). Should I set my crossovers around 120hz???🧐🤔

I have a pair of paradigm monitor 7v6s and matching center channel...They all can go well below 80hz, but I was told that it was better to leave them at 80s as my Yamaha receiver is sort of mid class and may not have enough power to play the bass frequencies on the paradigms.....Does this make sense to you?

Love your channel. Have a question on av receivers and using a crown amplifier for my mains don’t know what to set the input sensitivity on the crown amplifier to? my receiver is a denon avr 6500 and for speakers I’m using all cerwin Vega xls series my mains are the xls single 15s - center channel xls 6c - and the rears are xls-6 . Also really don’t know anything about base management because I’m new to this surroundsound area should I set my mains to small or large