Can I bridge or parallel my stereo amplifier board to one speaker?

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Күн бұрын

A common question I get is if the output of these amplifier boards can be bridged or paralleled together for more power or for driving one speaker. This video tries to answer this question. Of course there is a demonstration.

Пікірлер: 68

@GiovanniCarloIglina 6 жыл бұрын

Big thumbs up for the final demonstration, theory without experiments is never to be trusted.

@21thTek 2 жыл бұрын

Excelent as always, thanks so much John for all the hours you had spent teaching us amazing things, the way you do !!

@Lapeerphoto 5 жыл бұрын

Thanks. Exactly what I am doing raspPi to small amp into a vintage radio w/ one speaker. Thanks again.

@thomasseibold4055 4 жыл бұрын

I am trying to bridge outputs to an old tube-type desktop radio, too, using a small amp board with Bluetooth on board. I know how to hook up a single channel (using the radio's phono input), but I can't figure out a clear-cut answer (including in this video) about how to combine the L and R outputs into one. Any tips?

@nvmyutube 6 жыл бұрын

hey thanks for the informative vid on the class D amps John. im a bit of a newcomer here for the last few months but i do enjoy the fact you go into detail and i learn a thing or two. i do have a question though, would i be able to use two of these class D amps by means of stacking (bit of a car audio term i think) ? i have one sanwu class D and im wondering if i could purchase another to improve my output. Thanks -

@jrlmbert 3 жыл бұрын

Question: To getta bridge mode you have to phase shift one channel, would just reversing polarity (i.e. hook it up backwards) on one channel effectively invert the phase of that channel? If that does work would you wanna do it on the on the input side or the output side?

@krazzykiller1 5 жыл бұрын

I put a TDA7293 on the out put of a 30 watt Bluetooth amp thingy using a transformer for coupling and it works real good. been running for a long time 24 volts.

@paulhammersley4562 6 жыл бұрын

glad your dad's on the mend,

@killcar5nbike2 6 жыл бұрын

National semiconductor AN-1192 is a good read on BPO config for the technically inclined.

@parleyk4503 5 жыл бұрын

Say I built 2 of the exact same amplifiers and bridged their outputs. Could I just invert the signal of one of the inputs through an inverting op amp with no gain? I would test this but I don’t have an oscilloscope yet.

@RobertKohut 6 жыл бұрын

So no problem to parallel connection for a BTL amplifier (class D)? Same (identical) input signal to the L and R input and then parallel the outputs? No power gains, but improved lower impedance performance?

@sfmag1 5 жыл бұрын

So just put a .1 ohm resistor in series with both the right and left channel + out of the board and then hook them together to the load? Use one channel or both channel grounds hooked together as the - ground?

@AmazonasBiotop 4 жыл бұрын

@JohnAudioTech How many watt is the 0.1 ohm resistors? I am going to buy resistors for the same amp, When it do 9w @4ohm. Should it be 10w resistors?

@kienvinhgiang9863 6 жыл бұрын

Hi John, I tried bridging a class d karaoke amplifier. A signal was inverted by ne5532 and it worked fine. However, I don't know the output of this amp was bridged or not. Does this damage the amp?

@AmazonasBiotop 4 жыл бұрын

I saw in video on that and used four 0.1 ohm resistors to level the current for the tda7297. But I have seen someone instructed to parallel without the four resistors. So my question is if this chip can be parallel connected without adding resistors?? Someone told that there is enough of resistors in the chip itself! Can that be measured somehow that it works out for tda7297 without problems? I am waiting for my two tda7297 to be delivered and plan to use one for each channel. And the speakers I plan to use dips down to 4 ohm at two occasions in the frequency span. So parallel each amp so they're driving one speaker each is my plan.

@electromagix 6 жыл бұрын

Hi John, Can you please help me to further amplify the output of class D amp (PAM8610 ) as driver and power transistors as output device... first of all, Is it possible ??

@andymouse 3 жыл бұрын

Nice !...cheers.

@davidperreault8889 2 жыл бұрын

Hi, can you please tell me if this stereo amp can be bridged mono in and mono out? Pyle PFA300 If so, how would I wire it up? Schematic? Thanks Dave

@pufarezu 5 жыл бұрын

Hi, i have a 2.1 TDA2030A amplifier and i wonder if i combine the output of the subwoofer to the other two chanels ... I hope i get an answer, by the way the amp is a 2x20Watt + 30Watt Sub, whit tone corector .

@francisgerald7642 5 жыл бұрын

Just buy a speaker with dual voice coils! He did answer the question correctly first off. Screw all the other boring crap that comes after!

@shadowhunterxxx5891 2 жыл бұрын

I have a question i have stereo bluetooth module and i want to split the output signal to a low pass filter and then an amp to a subwoofer and an bluetooth ouutput directly to an amp for full range now question is can i split my bluetooth output into 2 diffrent way just by soldering 2 wire for each channel?or I should get a audio splitter for that?

@sergeykopylov652 2 жыл бұрын

8:26 to TDA7297 can I connect one 5W 16 Ohms tv speaker?? is it (TDA7297) only low frequence (bass) amplifier?

@marsudilormiri31 Жыл бұрын

sir i have a tda7498e btl subwoofer amplifier, can i replace the ic with tda7498L ?

@zombiedis 5 жыл бұрын

So inverted signal is unable with this boards? Only parallel with resistors?

@teohchiawei 6 жыл бұрын

i love your kitty :D

@mihaimihai7748 6 жыл бұрын

please tell me if I have a car stereo with 4x25w output , can i use it as 2+1 amp ? How to bridge the two back outputs to drive a subwoofer ?

@JohnAudioTech 6 жыл бұрын

Each channel would already be in bridged configuration. Use a dual voice coil sub and connect one channel to one side and the other channel to the other side. You would need a low pass filter for each channel as well. Car stereos are usually rated at 4 ohms, so use subwoofer with each coil rated at 4 ohms.

@mihaimihai7748 6 жыл бұрын

I will try that . Thanks for your quick reply !

@carlfranz6805 6 жыл бұрын

FEED YOUR DAMN CAT! Or as Dr. Jordan Peterson ssys ' clean your room. 😂 God bless you. Love your videos.

@noelj62 6 жыл бұрын

Carl Franz This is the last place in which I expected to see a quote from JP.

@erictheboringone5292 4 жыл бұрын

Paul NJ why’s that? The man says nothing that isn’t founded on fact and based in reality.

@ergindemir7366 4 жыл бұрын

I did the same exact test with TDA7377, and the power consumption suddenly exploded and the heatsink got hot. Normally you expect the opposite, since the amps see double the impedance, they should work more efficiently. Do you have an explanation why?

@JohnAudioTech 4 жыл бұрын

Sorry for the late reply. Probably one of two things. 1) phasing was reversed when the output is wired up. 2) Input signal is not perfectly balanced. (you can't feed it a stereo signal. it must be the exact same signal going to both channels)

@letsgobrandon2183 3 жыл бұрын

Is there a book where I can learn this ?

@tomstunes6595 3 жыл бұрын

Have a question ??? New to Class D amps. Im using a class D Amp with a 12 - 24 Volt DC power supply for my home speakers. The amp is rated at 100 watts per ch at 4 ohms. The speakers are 8 ohms , so does that reduce the output to 50 watts per ch. Into the speakers ??? Happy your dad is doing well 👍

@JohnAudioTech 3 жыл бұрын

Actual power (per channel) depends on the supply voltage. At 12v, max clean power is around 8 watts @ 8 ohms and 15w @4. At 24v, it is around 28w @ 8 ohms and 50w @4. 100 watts into 4 ohms is marketing fluff unless the amp can run on at least 30-32 volt supply.

@princecharmonpoirtoi 5 жыл бұрын

You mean cannot be used as pre amp and amplifier those board?

@zeroonezerofour3179 6 жыл бұрын

Hello my surround speaker of my AV Receiver gone bad. Its rating is 8ohms 50watts. Can I replaced it with a 4ohms 120watts? As indicated in the unit. Need your expert advise. Thanks in advance.

@johncoops6897 6 жыл бұрын

You need the speaker to be the same as the matching speaker on the other rear channel. Nobody can answer your question, as you are the only one who can check the specifications of your own AV Receiver (the one in your own house) and read whether it can accept 4 ohm speakers on the rear channels. You can check this yourself.

@JohnAudioTech 6 жыл бұрын

I'd try for an oem replacement. A different speaker will have different parameters and may change the sound. Otherwise, I'd stay with 8 ohms as most AV receivers would be rated at that. Impedance may be stated on the back of the receiver near the speaker terminals.

@anujkumar7810 3 жыл бұрын

Can i connect 6ohm speaker in tda7297 board

@MartaTrisna 5 жыл бұрын

hi john, i have some question, how about i want to use ( 1 bluetooth tpa3118 2x30w ) and ( 2 mono tpa3118 ) for powering 4 x 3" 30W 4ohm driver? for input of each mono tpa3118, i just take from tpa3118 bluetooth ( pin 4-5 R IN )-( pin 10-11 L IN ), and parallel power input 19v 3A

@JTLowry 6 жыл бұрын

that bridged output is kind of like American 220v outlets

@1pcfred 6 жыл бұрын

We have center tapped 240VAC.

@linandy1 3 жыл бұрын

So I can bridge a class D with a class A and what does that give you?

@randomstuff-wg6nj 5 жыл бұрын

Can I Connect 2 Speakers To a A Cheap Chinease Amp ? with Only 1 port Output ?

@Rainbow__cookie 5 жыл бұрын

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@Rainbow__cookie 5 жыл бұрын

Look at it

@bursafulusnet8407 6 жыл бұрын

how to make bridge with many amplifier

@simont3686 4 жыл бұрын

I want to run a single speaker on two channels. The input is not mono. Is there a way of combining the two channels to one?

@JohnAudioTech 4 жыл бұрын

This won't work. It is better to mix the input signal down to mono and use a mono amplifier.

@simont3686 4 жыл бұрын

@@JohnAudioTech Input signal won't work. But I've setteled on two speakers anyway.

@mrmshifan 5 жыл бұрын

Should I use the same methods to connect a stereo output of an amplifier to a single speaker? Thanks

@mr.amp0076 6 жыл бұрын

How do i inverse signales.... First taking a mono signale then use two op-amps.... One is non-inv.... & other is inverting configuration.... Then use a POT to gain mach those..... Or just use a single transistor stage.... & 2stage to inverse these....

@kienvinhgiang9863 6 жыл бұрын

Ranjan Gupta both ways are work but I like using opamp

@royrijpma 6 жыл бұрын

Sound is a AC current.. by swooping the hot and the cold you change the phase.. that's what we do if we running is phase problems in live audio