Parallel amps & Parallel Voice coils?

officeboy · 25th May 2004, 10:37 PM

I'm building an amp for my Shiva sub, and I have a question. Should i build a parallel amp, and parallel the voice coils, or should I just build an amp for each voicecoil?
Seems to me like the power output would be the same. So is it just a matter of preference?

(btw, the amp will be made up of 2 lm3886t chipamps)

markp · 25th May 2004, 10:49 PM

Parallel amps and parallel voicecoils for the most output. Parallel voicecoils will give you half the impedence for double amp output. The parallel amps will handle the load better.

officeboy · 25th May 2004, 11:13 PM

The output will be the same

, Parallel amps see twice the load, and parallel voice coils are 1/2 the load. Therefore the load per amp is the same.
Thanks for replying though.

sreten · 25th May 2004, 11:42 PM

How exactly do you make a parallel amp with chip amps ?

For a normal amp its easy, double up output devices, and use the
coils in parallel, of course double the rating of the power supply.

sreten.

officeboy · 25th May 2004, 11:48 PM

More or less by doubleing output devices.
And sorry markp, the whazzat emoticon thingy looks kinda mean

.
I don't mean to be a jerk (but it does usually come naturally

)

sreten · 26th May 2004, 12:04 AM

Well IMO its hardly different to paralleled input separate amplifiers.

Given the choice I'd keep the outputs seperate, 0.2R probably
means if one amplifier goes west (south), so will the other shortly.

sreten.

officeboy · 26th May 2004, 04:22 PM

Quote:

Originally posted by sreten
Well IMO its hardly different to paralleled input separate amplifiers.

Given the choice I'd keep the outputs seperate, 0.2R probably
means if one amplifier goes west (south), so will the other shortly.

sreten.

That was why I had posted, there seemed to me very little difference. I had through that maybe the parallel everything would be better since any differences in voice coil resistance, and amp feedback would be averaged out....

Any other comments out there?

markp · 26th May 2004, 08:12 PM

Officeboy, no offense taken, I misunderstood what you were saying by 'parallel'. In this case you are correct.

25th May 2004, 10:37 PM	#1
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	Parallel amps & Parallel Voice coils? I'm building an amp for my Shiva sub, and I have a question. Should i build a parallel amp, and parallel the voice coils, or should I just build an amp for each voicecoil? Seems to me like the power output would be the same. So is it just a matter of preference? (btw, the amp will be made up of 2 lm3886t chipamps)

25th May 2004, 10:49 PM	#2
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	Parallel amps and parallel voicecoils for the most output. Parallel voicecoils will give you half the impedence for double amp output. The parallel amps will handle the load better. __________________ If it sounds good... it is good!

26th May 2004, 08:12 PM	#8
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	Officeboy, no offense taken, I misunderstood what you were saying by 'parallel'. In this case you are correct. __________________ If it sounds good... it is good!

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25th May 2004, 11:13 PM	#3
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	The output will be the same , Parallel amps see twice the load, and parallel voice coils are 1/2 the load. Therefore the load per amp is the same. Thanks for replying though.

25th May 2004, 11:42 PM	#4
sreten R.I.P. Join Date: Nov 2003 Location: Brighton UK	How exactly do you make a parallel amp with chip amps ? For a normal amp its easy, double up output devices, and use the coils in parallel, of course double the rating of the power supply. sreten.

26th May 2004, 12:04 AM	#6
sreten R.I.P. Join Date: Nov 2003 Location: Brighton UK	Well IMO its hardly different to paralleled input separate amplifiers. Given the choice I'd keep the outputs seperate, 0.2R probably means if one amplifier goes west (south), so will the other shortly. sreten.