I'll second Elizabeths' recommendation of Behringers' 2496 as a room calibration unit and EQ/tone controller. Once set-up, the DEQ feature is just what you may be looking for. One DEQ sub-feature is adding a low frequency shelf. I can add or subtract the bass volume, frequency spread, and slope height of low frequencies using 3 rotory dials instantly, by ear. Once I set up the best slope for my main's, all I typically need to adjust the bass is one rotory dial, the gain of the entire bass slope.
The LED screen clearly shows the curve and effects. The DEQ effect can be set to flat or boosted/reduced by up to 20 dB's in 1 dB increments. 6 dB's doubles the sound pressure, giving you plenty of headroom.
Mine is connected between the transport and pro and is perfectly silent. Note that this connection and setting, when switching from 2-channel to 2.1, also increases the subs sound pressure level in the same frequencies through my digital processor.
For every 3 dB's of sound pressure level gain, it nearly doubles the load on subwoofer amps, so you may need to offset the sub's lower slope to keep it flat. I set my subs' slope to remove 12 dB from 40Hz down - nearly a reversed mirror image of the main's DEQ adjustments. That keeps both my EQ's main's boosted and the sub nearly flat. I set my SVS Ultra 13 low shelf at a gradual reduction slope to offset the DEQ boost - using 40 Hz at a gradual 12 dB reduction slope.
There are various connection options, too. Some prefer adding it after their DAC's, between the pro and amps. That removes the pro's digital processing effects on subs and extends its' use to all your music sources. You can connect it both ways with this unit and simply select the one you want.
It will not effect the mids or highs unless you extend the slope. Another cool feature is stereo width. One dial, and the stereo separation can smoothly merge into mono, to the original stereo signal, and onto a wider stereo separation.
I also emphasize first reading slowly through the short manual TWICE. It's actually well written once the newer pro-audio termonology is understood.
The LED screen clearly shows the curve and effects. The DEQ effect can be set to flat or boosted/reduced by up to 20 dB's in 1 dB increments. 6 dB's doubles the sound pressure, giving you plenty of headroom.
Mine is connected between the transport and pro and is perfectly silent. Note that this connection and setting, when switching from 2-channel to 2.1, also increases the subs sound pressure level in the same frequencies through my digital processor.
For every 3 dB's of sound pressure level gain, it nearly doubles the load on subwoofer amps, so you may need to offset the sub's lower slope to keep it flat. I set my subs' slope to remove 12 dB from 40Hz down - nearly a reversed mirror image of the main's DEQ adjustments. That keeps both my EQ's main's boosted and the sub nearly flat. I set my SVS Ultra 13 low shelf at a gradual reduction slope to offset the DEQ boost - using 40 Hz at a gradual 12 dB reduction slope.
There are various connection options, too. Some prefer adding it after their DAC's, between the pro and amps. That removes the pro's digital processing effects on subs and extends its' use to all your music sources. You can connect it both ways with this unit and simply select the one you want.
It will not effect the mids or highs unless you extend the slope. Another cool feature is stereo width. One dial, and the stereo separation can smoothly merge into mono, to the original stereo signal, and onto a wider stereo separation.
I also emphasize first reading slowly through the short manual TWICE. It's actually well written once the newer pro-audio termonology is understood.