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Post by totallbyaffled on Apr 18, 2017 18:14:28 GMT -7
I have infinite baffle, one FiCar 18" and two 15" upstairs, in a much smaller room (home theater) than I shall soon describe. Much power (5000 watts, Crown and Boehringer) behind them. Audyssey (multi-EQ 32, two sub channels, Marantz 8801 pre/pro) takes care of equalization. But I can't get below 30 htz up there, though the quality (but not the impact) of the bass is excellent otherwise. So this is frustrating...
Downstairs (much larger, 4x, space, same drywall construction), I recently installed two SVS PC (ported, cylindrical) 13-Ultra Subwoofers. Now, in this much larger room I have 10 htz extension, measured by the DSPeaker equalization unit, and heard and FELT by me. Ruler flat bass, says DSP, after it's work was done. This was not the case with Rel and Kinergetics, my previous subwoofers, not even close.
And the 'punch' factor, whatever that is in physics, was there in the gut like I have never experienced with the infinite baffle upstairs.
I'm not tempted to go infinite baffle downstairs.
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Post by ThomasW on Apr 19, 2017 6:20:56 GMT -7
'Punch' or concussive output is not a factor of simply how low a system plays, instead it's a function of how much output there is between say 80Hz-120Hz.
If you want 'punch' the system needs to have adequately sized woofers and adequate output from the upper end of the sub. Often times people have main speakers with a pair of 6" or so woofers, IMO that's not enough swept volume (potential air movement) to create a concussive (chest compression) effect.
Regarding your statement about not getting below 30Hz from the IB, this makes no sense. The size of the room doesn't determine how low a system will play. There are headphones that reproduce 20Hz. A lack of low frequency output is a function of the electronics in the playback system not providing adequate low frequency boost. This is either due to the electronics rolling off or a setting that's limiting the boost to higher frequencies. Or the room geometry is creating nulls that are canceling out the frequencies you're wanting to hear.
The only way to know what's actually going on is to get a measurement system (something like REW and a good measurement mike) to 'map' the frequency response in the room. Then one has accurate info as to make an informed decision as to how to solve the problem. Anything else is just a WAG.....
FWIW a properly set up an IB will provide not only the lowest notes a system is capable of reproducing, but a ton of 'punch' if that's what the listener wants.
The SVS subs are limited to a 16Hz port tuning. If the system is reproducing 10Hz, it's doing so by defying the known laws of physics
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