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Old 30th September 2003, 05:35 PM   #1
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Default How do you bridge two bridged amplifier?

Question 1

How do you bridge two already 'bridged amplifiers'? I never seen this before.

Can someone draw a schematic or block diagram on
how this works?

http://www.carsound.com/ubb/ultimate...1;t=001731;p=1

Richard Clark posted;

**************************************************
ok--now for some amp in series info---for starters i took a pair of amps--one was a kicker and the other was a dei--they were of similar power--each was a two channel unit---in the first test i measured the power of a single channel from each amp---4 ohm power was about 150 watts at 1% for each amp--i then put one channel of each amp in series and tested them into 4 ohms--power went up to over 500 watts--since each amp could drive 2 ohms per channel all did well--the results of this test can be seen at---Single Channel Test ------in the next test i put each amp in bridge mode---and measured the power into 8 oms--the dei did about 400 watts into 8 ohms and the kicker did about 250 watts----then i put the two bridged amps in series (bridged the bridged amps)and they produced about 700 watts into 8 ohms--see Bridge Test-they would have done more but my powersupply was a little too small for the test--thats why i did this test at 8 ohms---4 ohms would have been really drawing the current and our really big supply was tied up doing some other tests for the magazine--but these tests should get the point across----if you need big power at higher impedances like 4, 6, or 8 ohms or if you want big power at lower impedances and the amps really have a lot of current reserves then series connections are a consideration-------but wait before doing any of this---i will explain some of the complications and wiring quirks in the next post------

**************************************************


Question 2

If you read the link above, prior to this discussion he talks
about paralleling the outputs of similar amplifiers using a
0.1 ohm resistor to isolate amplifiers and matching the
amplifiers is critical. Has anyone done this ?
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Old 30th September 2003, 08:42 PM   #2
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Default Re: How do you bridge two bridged amplifier?

Quote:
Originally posted by thylantyr
Question 1

How do you bridge two already 'bridged amplifiers'? I never seen this before.

Can someone draw a schematic or block diagram on
how this works?

I'm not sure you can do it.

When you make a bridge you invert the phase of the audio going to one amp. So what would you feed to a bridged amp as phase inverted on this "super bridge"?

I think you would be nulling the signal, but my reasoning maybe flawed.

On the other side you would also be increasing your distortion, so I'm not sure another alternatives would not be better. Like increasing voltages.


Carlos
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Old 30th September 2003, 08:56 PM   #3
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You can do it under certain conditions but I wouldn't recommend it.

Look for inspiration here:
http://www.national.com/an/AN/AN-1192.pdf
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Old 1st October 2003, 05:16 AM   #4
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Quote:
Originally posted by peranders
You can do it under certain conditions but I wouldn't recommend it.

Look for inspiration here:
http://www.national.com/an/AN/AN-1192.pdf
Unless I'm blind, all I see that is interesting
is a bridged amplifier in parallel with
another bridged amplifier, but the original
post says the two bridged amplifiers
are in series not parallel

I vote also, it can't be done.
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Old 1st October 2003, 07:39 AM   #5
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At the moment I can only think of paralleling to amps but they must be identical with the same gain, etc. But you must also insert resistors, rather big ones.

But I use to say "think Decibel"! How many more dB can you get by this dubious actions, virtually nothing.

My opinion at this: Forget it.

Change to more efficient speakers and/or a substantially more powerful amp, at least 5-10 times!

If you play at 500 watts how much more is really 3dB (1000 W)? _very_ little. You can hear the difference but I don't think you experince 500 watts more. Test this by simply doing a 3 dB attenuator.
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Old 1st October 2003, 07:55 AM   #6
Vigier is offline Vigier  Netherlands
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@peranders,

just think of what those guys (at carsound.com) want to do with it. EVERY 1/10 dB is interesting.
In that topic I read about a guy using 7 DD subs and 28 amps. With that setup (a good install, way to much DC-power, probably running at about 16V) it's possible to hit about 170 dB.
In dB dragging, every bit of a dB is interesting. Here in holland there are a few guys who also use this technique (using Digital Designs or Resonant Engineering woofers). For those guys, there are now woofers with 4 voicecoils available, so the can use 8 to 16 amplifiers for each woofer.

@thylantyr,

don't try this it home! For that, I totally agree with peranders, and most of the rest here: it's not interesting, you'll have to match your amps VERY good, and if you go from 2 to 4 amplifiers it only gives you a 3 dB extra. For use at home it's completely useless.

Grtz, Joris
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Old 1st October 2003, 09:24 AM   #7
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Default Re: Re: How do you bridge two bridged amplifier?

Quote:
Originally posted by carlmart
I'm not sure you can do it.
What you actually want to do is run the 2 bridged amps in series. It takes a very special set of circumstances to allow you to do it but it can be done. Pass Labs X1000 is a perfect example.
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Old 1st October 2003, 09:39 AM   #8
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Quote:
Originally posted by Vigier
@peranders,

just think of what those guys (at carsound.com) want to do with it. EVERY 1/10 dB is interesting.
In that topic I read about a guy using 7 DD subs and 28 amps. With that setup (a good install, way to much DC-power, probably running at about 16V) it's possible to hit about 170 dB.
In dB dragging, every bit of a dB is interesting. Here in holland there are a few guys who also use this technique (using Digital Designs or Resonant Engineering woofers). For those guys, there are now woofers with 4 voicecoils available, so the can use 8 to 16 amplifiers for each woofer.
Sorry, I forgot one moment that those guys don't listen just measure decibels...

I saw a contest here in Göteborg at the audio exhibition at hotel Arken. Those car hifi gear seems to produce very high fidelity... sorry bass.
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Old 1st October 2003, 11:19 AM   #9
Vigier is offline Vigier  Netherlands
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Haha, indeed, the don't build anything to listen to, just to get as much pressure in the car as possible.

Grtz, Joris
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Old 1st October 2003, 12:04 PM   #10
leo14m3 is offline leo14m3  Romania
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You can't bridge 2 bridged amplifiers. You can double the power by paralleling amplifiers like in AN1192.pdf and halving the load impedance.
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