How an amp can change the sound of the subwoofer quite dramatically

[Gel Man]

I have been using 3 amps with my speakers recently and the amount of bass I get from setting all three subs up the same is quite amazing! On the Denon 2800h the sub is almost non existent, while the sub on the Pioneer vax-lx70 is hard hitting, loud and straight to the point. While my Pioneer VSA-LX805 subwoofer performance is some what between the two other amps.

I guess I never really thought how much a subwoofer performance can be changed by using different amps. For example if I was using the Denon I would think my sub wasn’t loud enough and possibly buy a different one to get more power. While the Pioneer amps are amazing with the sub performance, especially the Pioneer Vsx-lx70 amp.

Have you had mixed results and what did you do about it? Thanks

 

[Jasonovich]

I have subs in my three of my four HiFi setups, the bedroom HiFi is missing subwoofer, though not sure I need it, the Dali's Oberon 3's always sound full and I quite like the balance.

The AV in the lounge, the emotion and sound effects have intensified with the addition of Dali SW, the Denon AV amp with Atmos, really homes in on the sound. The Monitor Audio speakers front and rear, are neutral sounding and compliments well the SW.

My Focal SW in the study was challenging to begin with, sounding boomy and smothering the Adam Active speakers. It has dual speaker drivers and the sound was bouncing off the wall. I used my wife's palates mat and this absorbed much of the overblown vibrance. A little tweaking here and there and getting it in sync with the Adams, worked well in the end.

In the diner, bright sounding Klipsch R-50M speakers and Velodyne SPL Series 2 SW work well with Project Maia S3 laidback sound. The Velodyne SW is a sealed design and doesn't exhibit exuberance in bass or bloatiness, which is ideal for tight spaces.

 

[abacus]

If you are using the subwoofer out on the Receivers then the output level will determine how loud the subwoofer sounds. (If the output is at the same level from all the receivers then there will be no difference)
I suspect what you are hearing are the results after the room correction has been done, and some room correction software is better than others. (The worst ever was the one supplied with Yamaha receivers with Audyssey very close behind as both required a vast amount of manual tweaking to get them sounding anywhere accurate)
Most Denon's have a Dirac option these days, which is one of the best out there (If correctly set up using the app) and literally blows Audyssey out of the water.
The second option is that the Pioneers are giving you too much bass for your room and thus need tweaking.
Only you can decide which is best for your purpose, hence the reason manual controls are also provided.

Bill

 

[michael hoy]

Have you re run the room correction again on all the amps, if not they won't know what to output for the sub.
You cannot just plug a speaker or in this case a sub and expect it to work correctly.