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-   -   Is a bridge / parallel configuration of 3875 is better for my speaker ? (http://www.diyaudio.com/forums/chip-amps/75379-bridge-parallel-configuration-3875-better-my-speaker.html)

100db 7th March 2006 10:24 AM

Is a bridge / parallel configuration of 3875 is better for my speaker ?
 
Hello,

I'm using inverted LM 3875 with 24-0-24 v power supply ( +/- 35v to the pin).

I would like to know if I use bridge or bridge+parallel configuration can make my gain clone drive my speaker better ?

My speaker is Scan 15w-8530 + Vifa XT25, serie XO.

Bazukaz 7th March 2006 10:38 AM

I depends on your loadspeaker's impedance.
35V is quite much for this amp.For this voltage , a bridged config will hardly be usable for any lower loadspeaker impedances than 16Ohms.
You should search for overture design guide excel spreadsheet at www.national.com to get an idea what output powers at known impedance speakers you should expect.

Regards,
Lukas.

100db 7th March 2006 04:06 PM

Bridge will make the GC see a speaker as half impedance and parallel will push it back to normal impedance, am I understand correct ?

sreten 7th March 2006 04:33 PM

Quote:

Originally posted by 100db
Bridge will make the GC see a speaker as half impedance and parallel will push it back to normal impedance, am I understand correct ?
Correct. But how about 3 paralleled bridged pairs ?

:)/sreten.

100db 8th March 2006 02:40 AM

Quote:

Correct. But how about 3 paralleled bridged pairs ?
To make it handle a lower impedance speaker properly ?

This would be very interesting, anybody try this before ?
:D

Khron 8th March 2006 10:14 AM

Yes, it's been tried before, except it's with 6 LM3886s...

http://www.shine7.com/audio/bpa300.htm

DIYdo 8th March 2006 10:40 AM

From my BPO experiences you don't get the power gains expected. For the extra work load I have found it easier and more practical to use discreet components. Not saying not to try though. Chips are very easy to work with, and are very reliable.

sreten 8th March 2006 10:42 AM

Quote:

Originally posted by Khron
Yes, it's been tried before, except it's with 6 LM3886s...
http://www.shine7.com/audio/bpa300.htm

Hmm...

Its not 3 paralleled bridged pairs, its a pair of 3 paralleled amplifiers bridged.

:)/sreten.


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