The efficiency difference is an interesting find in the JP8’s. I’ve never wanted to mess with strapping amps together, but this is good info for the folks looking to do something like this.

The work you do to bring us the truth does not go un noticed . I have had quite a few shocks, no pun intended, about a lot of results from the testing you preform. Keep up the great work.

I reconed some subs for a local guy around Christmas time. They're d1.5 ohm coils. He had a single jp8 originally and now 2 strapped. He's running the amps strapped at 1.5 ohm(series parallel) and they've been solid. Very good power for the money, and reliable. Great video man! 👍

Thank you Derek for this video. I advise customers of the potential repair costs when strapping amps. Seeing the drop in efficiency lends clues to what is going on.

Actually, you could strap any two matching half bridge amps even if they don't have a strapping feature as long as the settings are pretty well matched and you wave a way to invert the phase of the input signal to one of them. If they have a phase inversion switch that would work perfectly; just set one to 0 and the other to 180 then wire them the way you illustrated. Or if the head unit or line driver has a phase inversion feature that only affects one output. The main advantage of strapping imo is the load seeing double the voltage, so you can get up to 4x the power into a given impedance than one of the amps could do into it individually (EG you're in an impedance crunch and can't wire the load low enough to get the most out of the amps individually, strap them instead). Even further you hypothetically could strap two different half bridge amps together depending on how they're grounded internally and how the settings/crossover phase distortion matches up on them Also amazing stuff as always Big D can't wait for the next one!!

I have one of these amps running at 1 ohm powering 2 JL Audio 12TW3-04 subs in my Tundra along with 2 of the JP84 amps powering the rest of my system and I am quite pleased with them. Price has done a good job with these amps. My system is designed to deliver the best sound quality it can and these amps are doing a great job. I was totally unaware of these amps before I saw them being tested on the dyno here on your channel. So thanks for that.

*SHOP* (Affiliate links and all may not be available) JP8 Amp: bit.ly/3wOBbhg JP8 v1.5 Amp: lddy.no/1fp9d JP23v1.5: bit.ly/3yYt9DN JP23v2 (not strappable with v1.5) lddy.no/1d7oj All JP Amps: bit.ly/3lMb4kz *RELATED VIDEOS* D4S JP8 Amp Dyno Test - kzfaq.info/get/bejne/hNVjpKaBrpqwfqs.html D4S JP8 Extended Amp Dyno Tests - kzfaq.info/get/bejne/iKl4m66hsp6XdoE.html D4S JP23 (v1) Amp Dyno Test - kzfaq.info/get/bejne/q8ylosxe29SRl2g.html D4S JP23 Low Ohm Tests - kzfaq.info/get/bejne/rJ2eosuJlamXl5s.html D4S Amp Test Video Playlist - bit.ly/3LTsom0 *VIDEO INDEX* 0:00 Intro 0:42 Need More Power? 1:35 How to Wire? 2:25 Master vs Slave 3:00 JP8 Strapped Amp Dyno Tests 5:29 JP23v1.5 6:42 JP23 Strapped Amp Dyno Tests 8:32 Pros and Cons of Strapping 9:21 Final Thoughts 10:02 EXTRA Tests *VIDEO AND AUDIO GEAR* Camera - iPhone 13pro 1TB - amzn.to/3nCjGvc RODE Wireless Go II Microphones: amzn.to/3Q6NVHl Shure MV7 Microphone: amzn.to/3A4OICK Zoom H4n Audio Recorder: amzn.to/3BXjVsS 960 LED Panel: amzn.to/2Sxoq3S *TEST BENCH EQUIPMENT* SMD / D'Amore Engineering Amp Dyno: goo.gl/sJTcf7 XS Power D1400 Batteries - amzn.to/2BPFCKW XS Power PSC60 Charger - amzn.to/2CHGcfs Fluke 1000A AC/DC Clamp Meter: amzn.to/2Rw5WDA Handheld Dyno: amzn.to/2u2EgKV My Favorite Screwdriver Kit: amzn.to/2x0VzcE _DISCLAIMER: This video and description contains affiliate links, which means that if you purchase from one of the product links, I may receive a small commission. As an Amazon Associate I earn from qualifying purchases_

Most interesting video because I stopped customizing OP's auto sounds after 30 years @ the turn of the century, when seperate amps were for splitting Bass, Mid and Highs. My focus had turned to building computers and being in the country all we had were phone lines for internet with modems topping out at 56K. I had up to 4 phones and could STRAP each with modem together which would increase the internet speed up to 4 times...

HEY. ALLL CAPS JOE HERE. THANKS FOR CHANGING THE SIDE CUTS. THAT'S HOW YOU DO IT. WE LOVE YOU

Excellent video as always man!

Cool to see the definition of “strapping” amps.

(Edited) I ran 2 Jp23v2s at a final load of 1ohm and got some crazy readings on the amm-1. They can for sure handle it but I still have to say try it at your own risk!

Many years back in the 1990's I was getting into the extra sound in the car system but did not want o spend much, but still wanted good as I could. So I bought the Radio Shack (Realistic) 120 watt 60X2 subwoofer amp. Seeing they could be bridged stereo to one mono channel with the built in switch and wiring instructions and I had a dual voice coil subwoofer in a tube I bought a second one. Found out a few months later they were discontinued and marked down greatly, and made a deal and bought two of the 160 watt amps that looked similar, but without the subwoofer filters.. Some years back I was experimenting with these and wondered if it was possible to bridge the 160 watt even though it was never meant to be. These had built in high level input connections ( meant for the 1960-1980's cars. ) so I just connected the output like the 120 watt amp had said for bridged operation and on the input side I wired in one channel correct positive to positive, and the other channel I found out works if done the opposite way on that channel. Thus it was bridged. They did apparently share a common internal connection like the other amp, but I never traced or looked at the circuit closely to see if I was wright, but a general look inside of the amp cover. I never tried this long term, but the principle should work but obviously bridged always means the bottom ohm load will have to be raised to twice that or the amp will overload. I would suspect even a 1 or 2 ohm resistor linking a second amp could also be functional on a none approved matched amp set, and the input swapped on one as well.

That's insane! I didn't even know amp strapping was a thing until now.

I was just talking about strapping this last week and how I have no idea how to do that!! 😊 Definitely think I'd just buy a bigger amp, easier all around it seems. Love the content my man!

Just picked up a jp23v1.5 in black about 3 weeks ago for 249.00 and that a steal folks ....this amp puts in work ....if you have the electrical to support it .....that being said I replaced a skar rp1500.1....and it was a very good amp ad well but I run an American bass xr12 d2 ...and even though either amp would probably support 2 of these 12s I went ahead and picked up the jp23v1.5 because you can strap/ link it to another jp23v1.5. .....so when the budget allows for another xr12 d2 if I want more power I have that option ....and I am really impressed with the jp clip light is nice to have as well as temperature and voltage meter ....have played it at hight volume for extended periods of time and a out 118 is as warm as it has got .....not sure I have even had the fan to kick on yet .....glad see this vlog so i know around the power I would get if I do get another one and link/strap it ....big thumbs up big d .. .and hey that's my nickname as well

Lol wait @6:30 when you said cause you are subconscious. You wired the black amp as the master and the purple as the slave lol smart choices 😆

I ran my 2 23s at .5 for over a year they did great

This is how the old NAD amps are designed. I'm not sure about the 3020 series but the 3150 is linkable with 2150 as well the 3155 with the 2155. Into a 4 ohm load we be talking INCREDIBLE power!

good content as always D......one of my favorite channels, and i always go to see new content on sunday, the only channel i do that for👍👍

I had a set of Power Acoustik 12's long while back, DVC ect. Bought them from a buddy because he wasnt happy with them. He didnt quite understand the wiring with DVC style speakers. He was blown away when he could hear me half a mile away.

i normally only hook up the inputs for master/slave and invert the polarity of the subs on the slave amp . this gives you the ease of tuning on the master only without the negatives of strapping the subs

I can honestly say in 15+ years I've never actually met somebody running strapped amps in a non-competitive system. Maybe bc most ppl have subs/amps already RMS matched so when they want to go bigger it's likely they'll need another sub that can be run independently. The one benefit of strapping that can't always be achieved with more money instead is cutting down on your X dimension in exchange for greater Y if you're limited on space for length

Man I love these videos. Didn't know amp strapping was a thing. Also, I let a fellow Soldier listen to my system (made using the TopStrongGear) and he instantly wanted me to help him with his. Gotta admit, I wouldn't be back into car audio again if not for you. Also, he's using the same TopStrongGear amp. 😆 Gotta admit, it's small and powerful!

what's minimum THD your bench can measure? Lets say if I'm interested what power amp can do in 0.01THD or 0.005 THD ?

I just bought a 2nd JP8 just because it was super cheap and have been debating to strap them. I have two single voice coil 2ohm 12's I think I'm gonna do it after seeing this

Funny you post this now. Just did my first show with 2 jp23 strapped at 1 ohm.

Great Video !! Like always !! Back in 1991 I bought 3 Phoenix Gold MS amplifiers.A 2125,and 2 -MS-250 ( Actually the MS 275 ) I still have them in my closet. But they had Daisy Chaining back in the day .Master / Slave with a 1/8 plug Back then it was a big deal .

Awesome video. I’ve always wanted to see some amps strapped on a dyno, and now I have seen one 😂😂 Those amps are so stout

I am so glad someone finally did a strapping video. Thanks for a great episode as usual! I just have to figure out why no BIG D notifications 😮😢

🙌 💪 thank you Williston audio labs. Run JP amps strapped. ⚡️.

I have never strapped any amps but if you need to, that's really important need to know information there Big D.

Loved this. As Educational as you can get. You always explain stuff in normal language!

I've been waiting for this for a long time. Thanks. Always good info.

I have another 43 ordered today, and you put out vid on what I was planning, nice👍

Thank you for the lesson. Always nice to understand our options.

"Wired the Black amp as the Master." You wrong for that!! Lmao!!! "Socially conscious." That was funny!! I'm glad people can take a joke in this day and age!! Love the content, Bid D!! We old school guys gotta remind these kids of how we got to where we are today!! Keep it up!!

Good video. I've been really wanting to pick up a JP8 since watching your videos on it.

Another great video! Love the way the sine waves go with this one. Thanks Big D!

Yes!! Big "D"!! Ok, I gotta finish this Techmoan video and then some tragedy about space that was announced a few minutes ago (yeah, they title them to sound so ominous and vague, but still love me some space videos/updates)...but then it'll be your turn! Can't wait. Just had to comment before sitting back with my fur-babies and then forget to or something like that. You rock my good man!!! Have a wonderful day and thank you for everything you do! And you too, whoever is smiling and reading this! If you're not smiling.. Grrrrr! Smile! - it makes everyone wonder what you're up to! 😁🍻🌎❤️🌮🎶

I lol'd at the random big dummy so hard. Your big social wit is impressive 😂. Thanks for the video this is a new concept for me didn't know this was possible. would love an in depth video going in more detail how to do this. Like I wonder if it would work with headphone amps even?

I've been waiting forever for someone to do a strapped Dyno of some amps. It's always advertised on brands that support it, but hardly anybody ever does a Dyno on them.

Every time you run one of those brutal tests I'm just absolutely astonished and the performance and durability who those D4S amplifiers. The kind of remind me of the fosgate amplifiers in the '90s where you could just hammer the crap out of him and they would still just keep going

Thank D that was the best strapping video yet

What I learned from wattage on your dyno? When test your amplifiers at 4 ohms 2 ohms and 1 ohm That's straight power the amplifiers are recieveing? But when you put a subwoofer in a enclosure the impedance is going to rise how high anywhere from. 5ohms to maybe 1.5 ohms so the amplifier is not going to perform better than your dyno and uncertified is a danger zone for any amplifier clipping means voltage drop on the electric system so certified would be anyone's best route ?Just saying but overall I would like to commend you for your efforts and hard work you been showing us over the years? Great job Sir 😊😊

LOL that socially-conscious bit... hilarious😂

Lol like how you made the Black JP the Master and the Purple JP the Slave very smart there. 😅

Awesome video Big D!!! I’ve always wondered how the power output does when the amps are strapped, and now I know. When I bought my JP8, I purchased the 2 year warranty that covers running it at 0.5 ohms. Soooooo……. that makes me think when running speakers with impedance rise, I could run 2 of these amps strapped at 1 ohm. Hmmmmm………..

Looks like those JP amps are turning out to be pretty reliable. Great video, sir! ….sending them 6x9s running for the hills!

Really stupid question. A dual 1ohm wired at 2 ohms. What would be the final impedance on a strapped amp set up. Would stay at 2 ohms or would it be 1 ohm per the strapped amps. I've asked this question an no one can answer it for me. Thank you for your time and efforts.

I strapped two skar sk2500 at .50 which I would not recommend and in an actual vehicle I clamp 7900 to 8100 watts depending on voltage, when strapping if you go below 1 ohm be very careful when playing music strapping below 1 ohm is better for burp runs

Thanks for doing this. I've never tried it.

You should've hooked those amps to a beefy sub and meter it. Give the people what they want lol...big bass!! Im planning to strap to audiopipe amps to an American Bass 12 XR.

Thanks for doing this. I was curious how strapping worked. From what I see, they're running in series.

So why not gain match, phase match to get the efficiency back and more wiring configurations? Wouldn't that be better?

They did not provide "Whack Math" as you call it. The math is absolutely correct. At 1:20 they show 650 watts at 2 ohms at 14.4 volts, that would be 36.055 volts at the outputs. Formula for wattage 36.055volts x 36.055volts /2-Ohms=649.98 watts (650 watts). Once you "Strap" the amps you now have 72.11 Volts at the output of the 2 "Strapped" amps. 72.11 x 72.11 /2 Ohms = 2599 watts... Otherwise known as 2467 watts @ 13.79 Volts just as You showed us with your dyno test. Again back at 1:20 they show 2300 watts at 2 Ohms @ 14.4 volts. That's the part you call "whack math" but no sir, that math is absolutely correct and you demonstrated it. They show 2300 watts into 2 ohms strapped instead of 2599... why? Maybe their power supplies aren't strong enough to push against each other when strapped, maybe other reasons, the world may never know. Will you publish this post? I hope you realize your mistake, surely you know ohms law and the way to calculate wattage by now. Have a Nice Day

I've been running 2 jp23s v1 for about a year and a half now first on 2 skar zvx 18s in a wall build now they're strapped at 1 ohm on a zv6 12 pushing it hard daily

You should try and do some dyno tests on some nemesis audio amps. I see them around a lot but I haven’t seen any amp dyno tests on their amps so I think it would be nice to see them on your channel

"I wired the black one as master" *nervous laugh* 😂

Nice I have my 2300 rms watt Soundqubed amps strapped at 1ohms. That's .50 per amp!

Nobody need so much power..but it's a nice to have😂😂😂 And it's the best way for a boom car🫡👍🆙️

Damn. I’ve been out of the loop too long. My last system was 6 Memphis 12”s and three 1000d’s and that sounded nuts in 2012. I didn’t have all that fancy strapping of 5000watts I had 3500 over all at max. Probably didn’t use all of it at all Kid at my job is running 3 18”s at 3000 watts a piece basically. And I started looking into all this new fancy stuff.

The heat sink case looks really similar to US amps from the late 90s

It is about time someone did this! Big D FTW!

I'm gonna have to buy some JP amps this summer.

How’s it getting more power? How’s the efficiency getting worse.. 2xD’s make an AB..? Is this normal for all brand amps strapped? Great video, this isn’t newbie information

My qusstion is would u get the same outcome if u perfectly gain matched your 2 monoblocks and wired one amp on each voicecoil on a single subwwofer build? So is strapping the same outcome should be right? 2 amps to 1 big amp or 1 amp per voicecoil power would still be the same outcome coorrect?

My mono Amps are not linkable but the way i run them i dont need too, i have two Pioneer GM-D9601 amps running at 2 ohms driving two 4ohm SVC subs each. i would probably be better off getting a more powerful single amp, it cant be the most efficient running two separate amps. I do only have one remote for both amps however, i bought a dual output potentiometer of the same value to replace original and put it in the housing and then added a second socket to it to connect the second amp.

Very nice video Derek thanks for sharing the strapping process with us. Have you thought about testing the Black Diamond DIA-K4?

Hey big D, I've been watching your show for awhile I have a question for you? My Partners came over, one had their bass Subs at 8ohms 2000watt rms, the other partner was at 1ohm 2000 watt rms both had the same amp company but obviously the eighth ohm app was rated at more power ( but it doesn't matter because they both played their music at 2000 Watts) , The 8ohm system sound way better it was clean crisp punching Bass not to mention he played his music all day literally with no smell of dual coils heating up, no nothing🤷‍♂️ My one-ohm guy could only play his music for maybe 30 -1hour straight without it having that burnt up smell with the amps heating up to the touch, it didnt have that clean crisp bass punch it sounded muddy compared to the 8ohm🤷‍♂️. I would love to see you do a test like this comparing sound quality with different ohms ....✌❤ Big D

Excellent video brotha

How does setting clipping work? Do you set the master than slave or does the master control clipping for both? Does it matter where settings are on the slave or are they all overridden anyways?

What are the odds of having a single jp23 & a single 2 ohm dvc sub is that I can go buy another jp23 & another 2 ohm sub & won’t have to worry about changing setups that’s dope

Do you absolutely have to run 2 power wires from the battery or can you just use a distribution block???

Great job on this video

Some say that the Purple amp is much, much better 😁😁 Now if Down for Sound could have the bass knob the same colour as the model amp it come with. 👌

Why do you do a bump test and see if it booms when all we can hear is crap on our phone or laptop?

He's a strapping young lad . Minus the young part . 😂 Thanks Big D✌️

summer coming up we need more sound and more budget bass :D

Strapping amps can cause phase issues occasionally. Best to have a 2 channel oscilloscope if you're going to strap your amps.

Hey big d wiz i just put 2 these in my cart yesterday thinking about strapping them get ojt of my head!

You said you can't get more than double the power by strapping amps together but you just showed us you can. Both amp tests was more than double of just a single.

Big D, please do dyno on the jp3 555 watt Amp

I'm getting ready to strap two Soundqubed 2200.2's together, do this is good info for me. 😀

Hi, can i use the Bridge out just for signal to a second amp ? Or i need an amp with dedicated RCA out ?

Damnit Big D are u Psychic I got the JP3/4ab and a Sundown 2k scv seen the matching jp23 thought I can get 2 for the price of one more 2kSCV and sell mine…I didn’t pull the trigger tax sale over… then u post this video… I’m gonna go ahead and get em!!!

Im feeling some kinda way bc I recently purchased a Skar skv2 1500. And it cost the same as the JP23 I see. Which in your opinion is the better amp? Should I buy another Skar and link it or should I sell it and get a JP???

You need a voltage and current stabilizer so that there are no drawdowns in active power. Do you have such devices for active stabilization of direct voltage and current on sale in the USA? Or do you need to design a printed circuit board?

The single JP23 was tested at .5ohm Could a strapped pair run when wired to 1ohm?

Does it not change the ohm load ,3 dual 2 whice is 0.3 ohm i don't want to do that right

How do you strap 2 amps to 4 subwoofers

BigD Wiz! i have a old hifonics brutus 1700 amp, and i want more power! im considering buying another and strapping just cuz… or should i ditch and snag a CT or other Korean 3k amp? im also trying to make a decision as to what to get for my next setup. ive spent countless hours watching your videos and others trying to come to a conclusion. i love hifonics for the past 15 years id love to see you dyno the 4000.1. thanks for your time - dave

What hz do you use to run your Dyno highs mids bass

I wanna see some of the alibaba or ali express amps tested on here lol like the recoil dl550.4

This is kind of a random question but while you were talking about efficiency it made me think of something. would an amp be more efficient being driven at a lower ohm rating but at a lower power rating. for example lets say an amp is good down to 1 ohm and makes 1000 watts, and 500 watts at 2 ohms but you only need that 500 watts would it be smarter to get a sub ran down to 1 ohm and just have the gain turned down or just get the sub ran at 2 ohms with the gain turned to the rated rms power?

what's up with the "DO NOT STIR FRY" on the board? Is that like an easter egg?

Big D, please do dyno on jp3 555 watt Amp 4,2,1 ohm stable ) thank you sir

sony jbl kenwood car amplifier how many amps transformer should l supply for home use?

549 amps... 😲 D4S needs to get into the alternator game.

I'm confused. When is 2 straps needed? When amp length is more than 2x width?