Originally Posted by jackox
Originally Posted by KX250F
I have been considering getting two POA amplifiers to go along with my AVP, but have some questions I was hoping you guys could help me with.
I am in the process of getting some new speakers (Aerial LR5 & CC5) that are not very sensitive 86 db and everyone who has them says to feed them alot of power. What I was considering doing is getting two POA amplifiers and using four of the 10 channels for each speaker. I would bridge two channels and run to the low end of each speaker and bridge two channels for the highs of each speaker. I would also do this for the center channel which would use up 12 of the 20 channels all together. I would bridge the other eight channels for my four surrounds.
Hear are some of the questions I have come up with myself.
1) I will need to get some XLR cables that have two connectors on the amp end
2) Can the POA be run in this configuration. (I'm not 100%)
No that is not safe, you will have to use use active crossover filter (that is not so expensive but you will need one per speaker or 1 for two depending on which you will get)http://www.behringer.com/DCX2496/index.cfm?lang=ENG
this one is an example of what you should get.
I agree that your speakers could use a good strong amp. And what you propose is to actually do some passive
FYI to others: Passive bi-amping is the use two or more amp channels to power the separate
(pay close attention to the word Separate) and independent
crossover inputs on some high-end speakers.
In the case of the Aerial LR5, it is bi-amp capable (first, remove any binding straps across the twin inputs on the speaker).
So yes, you could drive each speaker with two amp channels.
As for bridging the POA amps, please check into whether the impedance minimums, as they change when bridged, as the nominal impedance of the LR5 is pretty low (4 to 5 ohms for both crossovers combined, it might be different for lows vs highs when bi-amping, call the factory).
I'd say you'd have enough power with just bi-amping the three fronts, which would use six of the 10 POA amps, leaving four for your surrounds. Start with that and see how it works out.
As for the suggestion to put in an active crossover before the speakers, that's tricky, as you would also have to bypass the passive crossovers in the speakers. Major advanced stuff.
BTW- I've done that
with my MartinLogan set
, and use the DBX DriveRacks (4800 /260) as my active crossovers and speaker processors. The DCX listed is good for lower-end systems, but not what I'd recommend putting behind an AVP. The DBX 4800 is superbly transparent (as one might expect for a $5K unit).