Combined spin for speakers that need a sub?

[hex168]

The "score with sub" is already calculated. Is it possible to show a calculated spin for the speaker being tested combined with a Rhythmik Audio L12 (the only ASR-reviewed sub)?

I would have no idea how to do it - I'm bringing up the question for the math-and-graph-heads here. I suppose it is easier with a fixed crossover, but two or three choices might make sense given the variability in the point at which distortion gets out of hand for a tested speaker.

I've gathered that Amir does not care for making the end-user integrate a sub in order to have a complete system, but there are so many design advantages to limiting the low frequency response of the mains that I'd like to get a better view of the (theoretical) system performance.

Thoughts?

 

[Sancus]

Spins don't really matter for low bass, is the thing. All speakers and subs(minus some very specialized/expensive stuff like the Genelec W371A) are omnidirectional by 100hz, so you don't learn anything from the dispersion. Because of this, EQ also behaves in a predictable manner.

The biggest variables with bass performance are your room and crossover, neither of which Amir/Klippel can help you with. Assuming a well-done crossover, you can pretty much extend your speaker's low-bass performance to the -6dB point of your sub. That is what the 'with sub' formula is doing -- assuming a -6dB point of 15hz instead of the speaker's. That also does require a sub that is flat(or EQed flat) to 20hz in your room.

So basically what I am saying is, if you plan to use a sub, you should ignore the spin below the planned crossover point.

The only edge case where this might not work out is with a speaker that has an EXTREMELY steep dropoff right below your crossover -- crossovers are not cliffs and so some ability to play on both sides of it is required. This depends on the crossover slope, and for 80-100hz, it's rarely a problem. Even my tiny KH80s are fine with an 80hz crossover(though they play louder with a 100hz one, of course).

 

[hex168]

I was not sure if a spin had value in the bass, at least for a monopole sub. Thanks for clarifying.