Subwoofer levels

[Werd]

Anyone notice matching levels with mains isn't much different from low volume to higher volumes?. iOWs match the volume at a low volume and it still integrates with higher volumes on your main's while sub output hasn't changed from low volume.

I've also got it down not listening to volume but just going and feeling bass cone movement   I know the volume by the feel of bass cone movement.

I've had a servo 15" sub for years but never used it on an amp platform. Got my Nola sub on my solid tech amp stand. It smooths out the response and gives better low frequency tracking with my mains as instruments rise up and down with dynamic peaks. Also walking bass volume, it tracks the bass response with good volume integration. it's a revelation to say the least.

[mfsoa]

Isn't the frequency balance supposed to change with volume, per Fletcher-Munson?

If I know I'm listening low I'll give it another notch on the sub to keep the air vibrating.

Re platforms - I just put my SVS on their special isolation feet and heard the same benefits as you did. I'm sure an Auralex Sub-dude type of platform would have worked well too.

I just found a bunch of subwoofer test tone tracks on youtube. Check em out if you want to feel some bass.

-Mike

[_Scotty_]

I used the free REW program and a calibrated Dayton Audio UMM-6 measurement microphone from Cross Spectrum Labs at www.cross-spectrum.com
 This allowed me to precisely match the levels of the subs and accurately measure the systems low frequency response limits.
Scotty

[Werd]

Thanks good call on the Dayton.

[Werd]

Isn't the frequency balance supposed to change with volume, per Fletcher-Munson?

If I know I'm listening low I'll give it another notch on the sub to keep the air vibrating.

Re platforms - I just put my SVS on their special isolation feet and heard the same benefits as you did. I'm sure an Auralex Sub-dude type of platform would have worked well too.

I just found a bunch of subwoofer test tone tracks on youtube. Check em out if you want to feel some bass.

-Mike

I have my sub on this rack

[tmazz]

Isn't the frequency balance supposed to change with volume, per Fletcher-Munson?

No it does not change at all. What Fletcher-Munson states is that as the actual loudness of a sound changes, the perceived loudness our brains hear will change, depending on the frequency.

The frequency balance as put out by our systems is  physical and it is what it is. A microphone will measure this response. and barring any room interactions that balance will not physically change with a difference in volume, but F/M states that how we as humans react to and interpret those sounds can a does change with the loudness of the sound.

[richidoo]

Acoustic impedance of the cone varies with cone size and affects the f3. So a bigger driver will play flat with mid/tweet at lower freq, and will sound more detailed and more punchy at lower volume levels too. Imo, directivity and power response are less important than high acoustic impedance which feels better on music.