Two LM3875's for bi-amping OB speakers

inrank · 4th May 2006, 08:37 PM

hi,

in the summer i might be making a pair of OB speakers, i have been informed that they need to be bi-amped with a PLLXO integrated in to the amp.

has anyone done this kind of thing?

i was planning on using a LM3875 because of its simplicity, where in the UK can i get a power suppy for it?

would it be a bad idea to have both amps in the same enclosure or build two seperate identicle enclosures?

tgorham3 · 4th May 2006, 09:04 PM

Tell us more about your design choices/assumptions. If someone has enough information to give you advice on bi-amping I would guess there are some details you haven't shared.

There is some enthusiasm for OB designs on the >Loudspeakers>Fullrange Forum at diyaudio and at www.fullrangedriver.com
It would be worth browsing around there and, somewhat paradoxically, doing a search on bi-amping. Use of helper woofers and/or tweeters are not uncommon on otherwise fullrange designs.

inrank · 4th May 2006, 09:08 PM

here is the thread with my ideas and all the advice i have aquired.

CSS FR125S Cabinet

Nuuk · 5th May 2006, 08:17 AM

Quote:

in the summer i might be making a pair of OB speakers, i have been informed that they need to be bi-amped with a PLLXO integrated in to the amp.

No but I do use an active crossover with my open baffles that are driven by LM3875 GC's (powered by SMPS modules).

IF your speakers are efficient enough, the SMPS modules are a great PSU and you can buy them through me at Decibel Dungeon (where you can also find a lot of other infomation regarding GC's and my open baffles).

inrank · 5th May 2006, 08:21 AM

well the FR125S i will be using is 86dB and i will be using a woofer of simmilar efficiency.

do you sell the psu as a kit or made up?

whats the difference between inverted and non-inverted amplifiers?

thanks

Nuuk · 5th May 2006, 08:33 AM

Hmmm, my speakers are 95/96 db and I'm not sure if 12 volt rails would be 'man enough' for your speakers. If you do want to try them all the infomoration is on that link I took the trouble to give you!

Quote:

whats the difference between inverted and non-inverted amplifiers?

A word of good advice. You won't make any friends here unless you you do your own research. Life is not a free lunch!

4th May 2006, 08:37 PM	#1
inrank diyAudio Member Join Date: Oct 2005	Two LM3875's for bi-amping OB speakers hi, in the summer i might be making a pair of OB speakers, i have been informed that they need to be bi-amped with a PLLXO integrated in to the amp. has anyone done this kind of thing? i was planning on using a LM3875 because of its simplicity, where in the UK can i get a power suppy for it? would it be a bad idea to have both amps in the same enclosure or build two seperate identicle enclosures?

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4th May 2006, 09:04 PM	#2
tgorham3 diyAudio Member Join Date: Jan 2004 Location: KC Metro	Tell us more about your design choices/assumptions. If someone has enough information to give you advice on bi-amping I would guess there are some details you haven't shared. There is some enthusiasm for OB designs on the >Loudspeakers>Fullrange Forum at diyaudio and at www.fullrangedriver.com It would be worth browsing around there and, somewhat paradoxically, doing a search on bi-amping. Use of helper woofers and/or tweeters are not uncommon on otherwise fullrange designs.

4th May 2006, 09:08 PM	#3
inrank diyAudio Member Join Date: Oct 2005	here is the thread with my ideas and all the advice i have aquired. CSS FR125S Cabinet

5th May 2006, 08:21 AM	#5
inrank diyAudio Member Join Date: Oct 2005	well the FR125S i will be using is 86dB and i will be using a woofer of simmilar efficiency. do you sell the psu as a kit or made up? whats the difference between inverted and non-inverted amplifiers? thanks

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