I'm comparing the Infinity Kappa 12.1 and the Infinity Kappa Perfect 12 VQ and attempting to figure out which will produce stronger bass with my amp.
From the Infinity Website I find the following (using sealed 1 cu foot boxes):
Kappa 12.1: relatively flat frequency response (+/- 6 dB) of about 93 dB between 20 and 70 Hz. After that it drops off and is only at 70 dB when it hits 200 Hz.
Kappa Perfect 12 VQ: relatively flat frequency response of about 92 dB between 20 and 150 Hz where it rolls off slightly. At 200 Hz it's still at 88 dB.
My amp has a variable low pass filter of 50-200 Hz. Given that I like all types of music, wouldn't I be better off to go with the Kappa Perfect 12 VQs? My thinking is that they will give better response and higher output at higher frequencies with the same power input.
Having said that, it's going to cost me about $75 - $100 more for them and I'd like to know how audible the difference would be.
There is some difference between the kappa and the kappa perfect. I'm not saying there is a HUGE difference, but you are better of with the perfects. I've heard bot of them, and i find the kappa is missing a bit of ''torque''... The perfects have amazing sq, and spl is pretty good also.
the question is easy from and spl standpoint because of the adjustable q id expect more in this area with them as far as an sq should be decent as well again this could be adjustable with the variable q....id buy the 12vq
these are SUBS yyou're talking about here. The amp's LPF will be set somewhere between 50-80Hz. Probably closer to 50Hz, especially for a sealed box. A sealed box in a car, will play flat to about 9Hz in actuality since cabin gain will compensate for the natural rolloff of the speaker, and no infrasonic filter is required.
Now, above the LPF's cutoff, the sub should roll off to your midbass or midrange drivers, which will have a HPF set to around 100Hz with a Q of 12dB. That in short means the mids will roll down to where the subs roll off and everything will blend smoothly.
If you cross over the subs anywhere above 80Hz, they're going to sound like absolute crap.
home theater subs are set at 120Hz. car audio sybs are set much lower. totally different systems here.
The variable Q is made so that you can use the subwoofer in different box types, such as have a sealed box for daily piddling around, and an SPL box laying around for SPL. IMO, the Perfect really isn't well suited for SPL (not very serious SPL, anyway). The Q is made to optimize the sub to the box you intend to use, and if you change the Q in the wrong box for it, response will not be optimal (too boomy or too tight, depending on which box you're using and the Q). You're cheaper off to get the 12.1, performance is about the same minus the variable Q, and most people don't have a lot of boxes lying around nor do they intend to. It's more optimal to have a sub that rolls off above 100hz anyway. For example, Dynaudio's drivers are designed with their intended frequency response in mind, and above and below their required range, they roll off, thus simplifying crossover design and improving sound quality of the drivers without having to use as complicated of a crossover as a crutch.