Dang the amount of unrelated comment sections I've seen you in doc is getting ridiculous

So what’s better?

Ashmeed Mohammed i second this

Hannibal_Toast I plead the 3rd.

Funny thing, after this testing was done I played with it some more and got just shy of 15,500 watts out of it. I posted it on Instagram and Facebook.

@@EMFAudio Wow! It's amazing how much difference tuning makes.

@@MadDragon75 actually, all I did was open a door

@@EMFAudio Oh. I'm playing around like that too. Changing the port and, or sub positions can make a + or - difference.

For a given port area and volume the length should be the same for the same tuning, regardless of port shape.

Be sure to watch the Friday video LOL

www.emfcaraudio.com go get some while they last.

I was amazed, that’s brutal 😂🤘🏻

Right

Pry more than my other half will let me spend but what's price of 12k or maybe next smallest size down as well. I need power like that with rise

Explain yourself

Please explain

The efficiency doesn't effect the peak frequency, there are other factors. Also remember with the 6" port it peaked 63 and 8" port it peaked 60. I do think it may have changed as a result of how large the motor is and it's relationship to the port location. The larger area is more opened to the motor directly, which takes up a ton of width in that enclosure.

Port area is port area, kinda. Obviously if you're going to a larger port area from a smaller you'll have a similar result to this. Way too small of port area to way bigger will likely yield a bigger difference. But, single port vs multiple ports can also yield differences.

I'd have to see if I've taken the specs off that one, or have it handy. They're built per purpose so the specs vary. You can't look solely at the BL number. As impedance changes, BL will change, but that doesn't mean it's weaker or stronger. For that reason you use motor force factor which is (BL^2/Re). That levels the field for strength taking into account impedance.

That's extremely vague but also vehicle dependent. Low frequencies are what's hurt far away as well.

Triticum's improved port area calculator. Look it up

3.5-4 cu ft. is what we recommend for daily usage.

I've got 8 banks of XS Power caps emfcaraudio.com/collections/super-capacitors-1/products/xs-power-sb500-supercell-bank and voltage drop isn't bad, around 1 volt without the car running I think it is.

Comparing insufficient port area to also insufficient port area wouldn't be a good test.

Depending how close it is, it can. I don't believe it does in this case.

Following

@@ThomasShelby-uq8cz basically the more poor area you use the more you get a boost around tuning but the less bandwidth you'll have and for SQ a little less poor area just to make sure you flare

First honda I was ever in was a Yellow CRX. Dude had 2 15" IDQ Image Dynamics slot ported on a. Chrome Zapco long as the interior was wide. Pretty wild for the 90s

Ive always wanted a true Y49 crx just to see if they're really cursed. I had a red 90' si with 2 JL W1v24s in a sealed box with a JL 500.1 amp and I've never heard a cleaner system to this day. I ended up selling the car with the system and regret it every day. Pretty sure the guy bought it just for the subs lol

@@jordank7685 I had 2 w4D4 12s on N alpine v12 expert...very clean as well. I've always wanted a JL amp. My buddy has one powering an 8w7 in a crv

I thought about doing that but in this case there are issues with the weight of the sub making the box tip over. Your question does spur an idea for another video though so I may do that in the semi-near future.

@@EMFAudio sounds good i tested this with a 6.347cuft box mathematically tuned to 34hz using 4x 6in round pvc ports.. with a single fi sp4+ 18 i found 3db at 36.8hz normal install and 33.1hz inverted still thinking about it also inverted was 0.2db higher on avg over 2mins at 1kw fixed rms used noise pink to test clipped everything below 20hz and above 120hz so really just pink bass. Measured response with my minidsp mic at 5ft

There may be some difference but I suspect not much. I'm assuming it's a musical build so to me the effort probably wouldn't be worth the reward unless the box just isn't right to start with.

@@EMFAudio awesome, it is a daily driver build so it will be mostly a musical build, but that is why I chose a tunable port, the box will be 6.72 cubic feet after all displacements of subs and ports, that's as close to the recommended volume i could get considering trunk size, I may burp it at shows for fun to see what it will do but is not designed for that.

For SPL I'd go off cone area, so 2 subs means 2 ports, and for SQL I'd go off box volume, so 1 or 2 sub's in the same box would have the same port

If you're adding subs you're also adding volume so you should be adding port area. If you're adding subs and not adding volume you're probably not going to have a good result unless the box was way too big to start with.

Your port area when building just a ported box as a rule of thumb should be around 1/4 of the total cone area. It depends on your subs, but thats a generalized size. Any smaller and youll end up choking your output, reducing efficiency, and introducing port noise. Any larger, and youll end up possibly over extending your subs by not creating the back preasure it needs, and muddying your sound. The only time where you would break away from that generalized size is when youre doing a different style box (bandpass, t-line).

@@ngaudio9143 That works for conventional subs, but high Xmax like the Ermagerd v2 needs more and high motor force like the YOLO also tend to benefit from more. The higher you tune the more port area you need as well, for any sub.

@@EMFAudio Thats why I put the 1/4 cone area is a base generalization, and that it really depends on the sub itself.

Explain yourself

That is a good general rule, but CRX's are another beast. Quite often the port just has to be a certain length away.

You could pick them up, but they aren't at the warehouse just yet. You can buy them on the website though.

@@EMFAudio It's going to be a week or two before I'll be needing them maybe three. What would it cost to re-cone a 18in Kove armageddon and do you make the re-cone kits? I heard PSI makes a kit that fits the 18in armageddon subs, but definitely getting the lowballers I heard 2 15in in a civic that was ridiculous! Love your videos btw,good stuff! I'm currently learning amplifier repair and have successfully repaired 10-15 approximately and trying to get some Brazilian amps to diagnose and repair if you know anyone who has one in th he boneyard that's smoked I'll pay for broken amplifiers. Just lmk when you get those in and I'll come pick em up thanks!

They can be made using pipe, a mold, and heat, but I didn't make them. The 8" is Big Ass Ports and the 6" is Precision Port with a different middle section. That box is ~1.6 cu. ft after displacements, depending on the sub.

@@EMFAudio thanks for all the information sain hello here from Puerto Rico one of my friend from P.R recently went to the shop and bought two of your EMF 15 neo. Over there in south Carolina.

Need help with my car is a two toyota Echo 2001 how I cant get in contact with you P.M.

@@davidspl Email is best, you can send us a message from the contact for on our website www.emfcaraudio.com

Efficiency is always louder power for power but what you're saying is what the YOLO did, really. It went up to 8 ohms and I ran out of power. Had I been able to make more power it would have been louder. It's possible a little less efficiency would have gained more from power. Generally speaking in the SPL world people just wire subs lower in that case.

@@EMFAudio ah I see, Thank you!

But did you try different port areas? I personally have tried different port areas and seen more gain than in this video before, but it was in a more optimal volume for the subs being used. I think this does show that you don't necessarily need all the port area for some applications to get an inaudible difference in result.

try 4 8” ports 💪✅

We didn't tryed different ports, but we will reduce the area of the existing port to see what happens. Here is a video of the same box in obs tahoe kzfaq.info/get/bejne/iJyqn6-DnbKbg3U.html

My rule of thumb is go wide as you can as long as the length will fit.

I personally have seen larger gains than displayed in this video, there are a lot of factors happening in different applications, but 6 dB is definitely not just from a bigger port unless we're talking extreme changes.

10" of height meaning it would have to fire forward or backward? 10's are 10.5" OD so that sounds like you're limited to 8's, period.

Yes, it absolutely matters. Some cases more than others, but it does matter.

@@EMFAudio what would you recommend for sub and port placement? My sub sits, on top of the box and port is on the side, obviously there is a few positions I found the having the port facing into the cabin was loudest, sun is a blaupunkt 18" but with a custom voice coil

@@Carlst17 depends on the vehicle but it sounds like you've figured it out

It's possible but I don't believe that is the case here because the playing frequency was the same in most cases. On the flip side to that, moving the enclosure would change more things than just getting the port position the same. There is no case where everything could be matched 100% dimensionally speaking.

I'll also mention I think it's further away than you think. It's about 6-7" away I believe with the 8" port.

np just a thought thank you and i greatly appreciate the video keep them coming.

The port and sub placement in the box as well as where they aim can make a huge difference. I mentioned those things in another video about SPL tips I believe.

CRX, yes.

@@EMFAudio close I was going crazy cuz I had a 94 hatch and that back seat looked like it and the side mirror and the cowl. Nice u saved one from being improperly upgraded!

The tricky part there is when you don't have impedance rise, you aren't efficient. Efficiency is louder than power, the more efficient you are the higher the impedance rise you have. You should be more worried about the end result than the clamped power.

@@EMFAudio im so glad that someone with credibility said that. If you're not rising, youre inefficient

Your statement is a bit contradictory. You say there is no such thing as too much port area, then say "if" this and that. You CAN have too much port area, where the port becomes ineffective as a port and it's just a "leak". It's the point where the box is no longer acting as a box. It's like holding it in your hand hand and opening the garage door and saying it's a ported box.

@@EMFAudio Read the Salvatti white papers. I'm sure you've seen walls with 3x as much port area as cone area that perform well built by guys who have done extensive testing. The "for practical purposes" caveat being that obviously you can't put a 15" diameter round port on the box in your video because it won't fit on any side of the box and probably wont' fit in a Rex and honestly I was surprised the 8" one even worked as well as it did for you considering how it was crowded into the back wall of the vehcle (I've had that both gain big and also fail). The point being, if you can fit more port area while maintaining the fundamentals of proper port design/placement (being far enough away from everything else or not being an unusual shape like 1" by 1000" for example) it will gain efficiency up to the point where we just can't fit more port on the box. And in fact the garage door will act as a port now whether it happens to tune anywhere useful depends on the volume of the room, area of the door, and depth of the column of air that will resonate, but it's the same principal as a Tahoe with a 1 cube box in the back gaining when you open a door or window. Also we will hit diminishing returns at some point but for anything we can fit in a car you're going to gain efficiency if you can add more port area all other things being equal.

Port compression absolutely limits your output. To demonstrate I'd have to build something specifically for that. Smaller port area needs less length, so I couldn't put a 4" port in this enclosure because it wouldn't be long enough to do anything, literally, tuning couldn't be achieved.

I have no idea what you're talking about.

@@EMFAudio The white van that you asked for suggestions on the sub layout from us viewers.

@@elsey1976 That is definitely not a Mystery Machine. In the video I also said I'd decide what I did in it when it got 2,000 likes, which it's nowhere near. So until it gets there, I'm not doing anything.

You do 15's or a bigger box.

passive radiators

@@EMFAudio dang ol sum ma ma bitch man

@@williamkillingsworth2619 thanks for the input

SQL isn't a thing, it's a term people use to describe a sub that isn't exceptional in a single usage. IE, a versatile balanced sub. /rant The Lowballer and Banhammer line fit the bill for that application.

We haven't had v1's in so long, the v2 is discontinued and has been unavailable for a few years now.

If you add port area and leave the same length, you're changing tuning. If you're adding port displacement you're also reducing box volume, which changes tuning.

@@EMFAudio Damn, guess ill have to build the port cause no one sells 7" ports.

If you aren't local you probably won't want to pay the shipping on the sub back and forth.

I like most, just make another baffle and put it on top of the other. In some cases you have to cut out the old one which I do with a router. I always just bond them with wood glue and screw them down.

@@EMFAudio ty 4 responding

I haven't done a video like that, I thought about it, but the proper way to do that would require a ton of setup and building something specifically for that.

@@EMFAudio Yea I hear ya. I just know your no bs way of doing videos and actual real info would be great.I do both style box's and don't notice any difference. Keep up the good work!

The reference to middle is in the port diameter, not the length. If it doesn't curve it doesn't matter about measuring in the middle.

@@EMFAudio its long enough to have to be an "L" I was just trying to male sure if I go to the center instead of the wall

Having a subsonic filter only matters if what you're playing is too much below tuning. Example, tuned to 32 hz and never play below 32 hz, the subsonic filter would do nothing. If you were tuned to 45 hz and played 30 hz, that's where a problem could occur at higher volume levels.

@@EMFAudio ok I get it. So my box is tuned to 37/38 I think. Its a 2.5 cft box but with sub dis its 2.3cft. The port recommended was a 4" at 190mm. That should tune to 37hz. The mistake I made was I got a horn style port. The bottle neck is 90mm wide with ends flaring to 125mm and a total length of 200mm so its hard to figure if its tuned higher or lower than 37hz. Should i pos look into getting some kind of inline ssf at either 20 or 30hz? Thanks

@@Pkdimmock You can use a port calculator to figure out how that turns out but that sounds like it's definitely too small of port area. That's a pretty high tune for music too.

Europero el carrito

They were in fact tuned the same, because otherwise would be a variable that changes results.

Music is music, sweeps are sweeps.

Area is area, shape matters though.

Standby for Tuesday!

@@EMFAudio thanks bro

There are a few, I think they're mostly on Facebook.

BaSsAholiC SAAME. I WILL NEVER HAVE THE MONEY BUT SAME

@@Jervin-Music yeah I'm in the same boat and my luck is shitty too. So it's highly unlikely I'd ever win 1 or the money to get 1 lol. Although I suppose if we were to put aside a little money here and there... maybeee eventually we could raise enough money. Maybe...

I had one and I paid only $1250 for it! Now he wants over $3,000 for one. They aren't all that. I switched to Fi and they are monsters(Sp4 plus series) I promised you, that you can't go wrong!

@@johnathanhunter7899 right on I'm sure there are a few subs out there that can bang just as impressively. I gotta say though, none have ever caught my attention like the ermergerd v2 or even the v1. I mean overall of course but I'm impressed by the look alone too.

They're priced over $3,000 so people will stop asking about them. We don't have any to sell and I got tired of telling people we don't have an ETA several times a day.

"Low bass" is from tuning, box volume, and the sub, not the port dimension. There are port guidelines that generally perform better, but none reflect its ability to play low or not.

EMF Audio Thank you Sir.

Hi, im in your sittuation, talk with me pls and we can have a conversation

I mentioned in the video I was playing the peak frequency, I think what you're describing would be best suited as the same sub in the same box in different vehicles, and I can do that.