Axiom Home Page Forums General Discussion Advice from Axiom Owners Suggestions for Speaker Placement & Sub Crossover

Here are a few things to consider :

1. You mention that you are alternating between two amplifiers. Just wanted to check that you are disconnecting one amp from the speakers and sub when using the other... the switched off amp can interfere with the sound in some cases.

2. With M22s I would take the crossover frequency up to 80 or 100 Hz. In a large room I would lean towards 100 Hz.

3. Your description of the sound (thin and boomy) is a classic "room interaction" problem. Sub placement can make a big difference - have you done a sub crawl ? If you haven't, the idea is that you place the sub in your listening position then crawl around the room looking for the spot where the bass sounds the most smooth and clear - then put the sub there.

The location of your listening position relative to the room walls can also make a difference. If your speakers are at the walls and you're at the midpoint between the walls then you're probably going to get relatively weak LF response.

There are all kinds of other room issues you can play with but get the sub placement right first. You can also tweak the sound a bit by playing with the M22 distance from the back wall; too close gives boomy bass, too far away can give weaker bass. If you raise the crossover frequency then M22 placement won't make as much difference as sub placement.

4. Thin and boomy also sometimes describes main speakers wired out of phase, but that doesn't happen so much these days now that everything is colour coded. Worth a quick check anyways.

Anyways, that's a start. Good luck...

EDIT - there are pictures ? D'oh !!

(thanks JohnK ;))