question on lsi25

dansie

i have a new denon 4806ci receiver (one powerfeul bad boy) i have for my fronts a pair of lsi25 (center lsic, an energy separate sub, and 4 energy surround speakers). i have gotten many opions on the best way to hook up the lsi25 to the receiver (bi-amping,or running a rca cable to recv etc). does any of you gurus know what would be the best way to hook the speakers to my receiver?
thanks

frodaddy

Someone please correct me if I'm wrong, but the LSi25's aren't bi-ampable... or rather you'd gain nothing from it. The lower set of binding posts are merely speaker level inputs for the sub amplifier. So if you used your 4806's ability to bi-amp, you'd just waste the power since your LSi25's are converting that back to a line level signal to feed the amp.

I just read the manual for the LSi25's to verify, and my RT2000p's work the same way as these do.

When I got my 4806 I wanted to use the bi-amp feature as well, but there really is no need.

McLoki

frodaddy wrote: »

Someone please correct me if I'm wrong, but the LSi25's aren't bi-ampable... or rather you'd gain nothing from it. The lower set of binding posts are merely speaker level inputs for the sub amplifier. So if you used your 4806's ability to bi-amp, you'd just waste the power since your LSi25's are converting that back to a line level signal to feed the amp.

The lower set of terminals goes to the sub amp as you mentioned, but also goes to the two 5.25 woofers in the tower so yes - you could bi-amp.

Give it a shot and see how it sounds both ways. I would not expect night and day difference bi-amping from an AVR, but if you have the capability try it and determine for yourself. If you end up getting a separate amplifier - I would let the amp handle the entire load and remove the burden from your AVR entirely. (i.e. - if you have a separate amp - don't bi-amp with the AVR, just let the amp take care of it)

Good luck and let us know how the testing goes. (and welcome to club polk)

Michael

frodaddy

McLoki wrote: »

The lower set of terminals goes to the sub amp as you mentioned, but also goes to the two 5.25 woofers in the tower so yes - you could bi-amp....

Michael

When you use the line level inputs for the 10in woofer, you take off the jumpers and only use the top set of terminals. So how would the 5.25 woofers get power when using the LSi25 this way?

EDIT: I read the specs on the LSi25 and it says they are bi-ampable, yet in the manual it mentions nothing of this. It doesn't make sense to me how bi-amping would work because to use the line level inputs you don't use the second set of terminals; so if the second set of terminals also feeds the 5.25 woofers, then you'll underpower them by taking the jumpers off. That would be a serious design flaw that polk wouldn't allow to go into production.

unc2701

McLoki wrote: »

The lower set of terminals goes to the sub amp as you mentioned, but also goes to the two 5.25 woofers in the tower so yes - you could bi-amp.

Unless they've changed them, that's wrong. On mine it was high-level subwoofer input only.


BTW: The LSi15's are different; on them the lower post goes to the two 5.25" drivers, also.

McLoki

I must have been mistaken then. I did trial some 25's a few years ago before I purchased my 15's - I must have remembered it wrong (or the 15's have clouded my memory). Sorry for the mis-information.

Michael