calibrating two subs with Denon 3801

[George Bellefontaine]

The 3801 only has one line level sub output. I have one sub at the front of the room ( approx 14 feet from my sweetspot) and the rear sub near the back wall and approx 6 feet from my sweetspot. I am using a splitter to run the back sub. I calibrated the front sub with the distance set at 14 feet. To do so, I had to shut off the rear sub. Now, how do I calibrate the rear sub for a distance of 6 feet ? I shut the front sub down and calibrated the rear sub as best I could without changing the 14 foot distance used for the front sub.I did have to tame the rear sub by turning the volume down a bit. Everything sounds okay, but the distance thing hsa been bothering me. Is it all that important for the sub ? I know it is for the rest of the speakers, but maybe I am worrying about nothing as far as the sub goes.
Any help or suggestions would be appreciated.BTW, the front sub is a Boston Acoustics 100 watt and the rear is a Yamaha 50 watt.




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[Lex]

George, I tried a dual sub configuration at the back of the room for a while, and really, it just didn't do that much for me, but it was a very small sub. At the time, I had Infinity Kappa 7.1s on the rear, and got all the base I needed from them. Now I have less bassy Concertinos.

Anyway, as you probably know adding a second sub at the same output level as teh first adds +3 dB when the subs are positioned optimally together.

Taking into consideration your several feet closer to this sub, if you don't want it to be distracting, I would say set it to somewhere between half output, and -3 dB from the 1 sub number. That's just a guess. I don't know of a way to scientifically set this, and not sure anyone has ever stated a right or wrong number for that. TV may know if anyone does.

Hope this helps,

Lex




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[George Bellefontaine]

Lex-
Thanks for your suggesion. It seemes to work just fine. Since I added the back channels I felt the extra sub in the rear would help. I have to say I prefer watching movies with both subs on after experimenting with leaving the back sub off. Again, thanks for your help.
George




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[Lexman]

I got to thinking, is it plus 3 dB or plus 6? Hmmm. I just stay to removed from the numbers anymore. lol.

Lex





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[Tom Vodhanel]

If you go from 1 powered subwoofer to an identical unit...it's +6dB.

If you have a passive woof, and you go from 50w to 100w...it's +3dB

If you have two passives and you;ve gone from 1 sub and 100w to 2 subs with 50w each...it's +3dB(assuming they are indentical)

Using multiple woofs in multiple locations can get a bit tricky...but many have claimed a surround subwoofer works well for them. After you've lived with the current configuration a while...try putting both units in the best corner of the room...and just split the LFE output of the receiver for both.

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