|
Critic's Corner Discuss a review. Provide constructive feedback. Talk to the industry. |
|
|
|
Critic's Corner Discuss a review. Provide constructive feedback. Talk to the industry. |
|
In Reply to: RE: Belt and suspenders... posted by hahax@verizon.net on January 21, 2024 at 20:50:01:
What your hearing at the low end is perhaps the only free lunch in audio, the room gain slope. A vented box rolls off at 24dB/oct at the corner. It CAN produce a greater sensitivity and output per cone motion....above the response knee compared to a sealed box.
On the other hand, if you put a woofer in a small sealed box with a knee around 60Hz and then put it in a car with the windows rolled up, it may well be nearly flat to 20Hz or lower.
While the box rolls off at -12dB/oct (half the slope of a vented alignment), the pressure containment slope of the sealed car volume is +12dB/oct.
Your living room is bigger than the car dimensions and so the frequency where the room gain begins is lower BUT the slope is still present.
At frequencies well below the knee, your sealed box produces more low bass than the vented box and while down in level, it is still detectable and part of the recording and at much lower level from the vented box..
I found an old compilation of cabin gain measurements for a pile of different cars. Note the range from around 80 to maybe 150-200 where many lie in parallel. Above that it is all various modal stuff but below that you see the effect of pressure confinement. A subwoofer with the opposite LF roll off slope and F (outdoors) would be flat inside that car
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Belt and suspenders... - tomservo 08:42:50 01/24/24 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
