GaryRudolph

I'm looking at going with Focal Polyglass 6.5 and 5.25 in an S-Pod. These are 75W and 65W nominal respectively. Will a 75W amp be enough (i.e. JL 300/4) or should I consider something like 100Wx4 (I just need to ensure it has 4 inputs)?

Thanks, Gary

PJK3

75Wrms x 4 should be fine.

GaryRudolph

Thanks, just wasn't sure if it was good to overdrive the speakers to help with distortion.

PJK3

overdriving doesn't hurt, but you can go too far and provide too much power to the speaker...

generally speaking the audible difference in volume between 75 Wrms and 100 Wrms will be minimal.

check this link out: http://www.bcae1.com/2ltlpwr.htm
it's a little technical, but has some insight into the issue.

GaryRudolph

I think I'm going down the 100W amp route, but a question is there a way to easily measure (by a layman) the power going to the speaker to adjust the amp so that it doesn't power the speakers with more than their rating? If not, would a typical audio shop have such equipment?

I can adjust the amp, but would have no way of measuring the output to adjust it.

PJK3

100 Wrms... *nods* no problems there... that's not a super large jump in power, so you should be ok. a 33% increase in power over OEM suggestions is most likely still within a safe range.

yes, there is a technical way to adjust the gains on a system. it requires the use of an oscilloscope, which is something most people will not have.
once again my favorite reference site has a detailed article on the 'how to'. http://www.bcae1.com/settinggainswithscope.htm
most audio shops will not have the required equipment.

here's a good bit more on amp gains and some info on how to set them...
http://www.bcae1.com/gaincon2.htm

from Crutchfield's site, they have a decent little walkthrough on setting gains that will get most people up and running.
http://www.crutchfield.com/S-tzbezin0Nnp/t.../tech/kb39.html

first, you need to know how to recognize distortion... if you're unsure, ask.
[QUOTE]
There are several methods of properly adjusting the gain (or sensitivity) setting on an amplifier.

GaryRudolph

Thanks, that's a tremendous start!

Yah, I don't expect an audio shop to have or even be familiar with operating a scope.

PJK3

no problemo.

and no, i doubt most shops have a scope... sheesh, i don't have a scope, and i'm like a junkie or something...