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Anemic subwoofer

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OldiesButGoodies:

--- Quote from: MacGeek on December 31, 2018, 08:19:25 AM ---Pepe- Thanks for the tips.  The satellite position is about the same as with the B & O's.  I have only incremental room to reposition them, but can try them closer or further from the rear wall.  I have adjusted the phase setting, but not slowly (yet).  I have not tried the crawl, but the sub is positioned in a fashion consistent with the instructions recommended in the manual.  Finding and using my pink noise generator and measuring gear may be tough, considering the remodeling project and the shape my rom is in

The low frequency performance of the sub is actually not bad, except for the level.

--- End quote ---

Hi Klaus,  Happy New Year's Eve to you and everyone on the forum...

Do not worry about getting any of you room eq stuff out,  just place the Deftech sub (phase set at zero, volume in the middle) on your listening position (plop it gently on the chair seat,  use a towel to protect the seat if the sub is wearing spikes).   Then play a bass-heavy track while crawling along the perimeter of the room like a cat.  You will find spots where the bass sounds more solid than others and places where there is amlost no deep bass (the nulls).  Then move the sub to one of those places where the bass sounded good to you,  go to your chair and listen to the track,  adjust the sub volume to taste (it may be too high) and you are done.   The difference can be amazing in some rooms. 

P

MacGeek:
Happy new tear to all and thanks for all of the tips.  I think I am going to do the sub crawl first, in the event I have a severe null, and then pursue the possibility of a sensitivity issue.  If that doesn't fix things, I'll try all of the other suggestions. Regardless, I'll let everyone know what I learn and the solution and hope it's not a trip to the repair shop for the sub.

MacGeek:
Well, I disconnected and rewired the entire speaker level signal path, just in case I had an oops somewhere.  No change.  So, I disconnected the speaker level wiring and used the low level inputs on the sub and separately to the amp driving the satellites via a "y" connector coming out of the switch box.  I had to back down the input level gain on the amp to nearly zero , but finally got a reasonable balance between the subs output and the satellites.  I loosely estimate there is at least a 10 to 15 db difference in sensitivity between the satellites and the sub when using the speaker level connections, compared to the low level approach.

Over all maximum system loudness is down considerably, and depending on the source material I can't play it too loud, which doesn't seem to be right.  I have never owned a system I couldn't drive to ear bleeding levels (even when all I had was a 26 watt Pioneer receiver).  Once I get my system up and running, this sub may need a trip to the shop, but it's serviceable in the meantime.

Thanks again to all for your suggestions.

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