[br85]

Ok, so this one has been bothering me for a bit now. As many of us, most crossover slopes cause phase shifts across their affected areas in both passive and active crossovers. We also know that higher order (i.e. LR24) crossovers will start rolling off BEFORE the calculated frequencies. (-6db at xover point for LR24)

Do the dsp algorithms simulate this? Or are they superior in giving in-phase and proper rolloff characteristics? Are all dsp crossovers much the same in the way they work? This interests me, does anybody know about it? Or if there's any easy to access info availa know ble on the topic?

 

[kevin k.]

Ok, so this one has been bothering me for a bit now. As many of us, most crossover slopes cause phase shifts across their affected areas in both passive and active crossovers. We also know that higher order (i.e. LR24) crossovers will start rolling off BEFORE the calculated frequencies. (-6db at xover point for LR24)

Do the dsp algorithms simulate this? Or are they superior in giving in-phase and proper rolloff characteristics? Are all dsp crossovers much the same in the way they work? This interests me, does anybody know about it? Or if there's any easy to access info availa know ble on the topic?

Some great questions and I'm interested in the answers, myself.

What I do know is that different dsp's do offer accessibility to varied x-over approaches... e.g., the Alpine H701 appears to be fairly basic, while dsp's such as the ZAPCO piece and the Bit One offer Butterworth and Linkwitz - Riley configurations, and the Pioneer Carrozzeria RS-P90X offers FIR.

 

[t3sn4f2]

Ok, so this one has been bothering me for a bit now. As many of us, most crossover slopes cause phase shifts across their affected areas in both passive and active crossovers. We also know that higher order (i.e. LR24) crossovers will start rolling off BEFORE the calculated frequencies. (-6db at xover point for LR24)

Do the dsp algorithms simulate this? Or are they superior in giving in-phase and proper rolloff characteristics? Are all dsp crossovers much the same in the way they work? This interests me, does anybody know about it? Or if there's any easy to access info availa know ble on the topic?

They all do really. A good way to visualize what happens is playing around with the Zapco DSP software. You'll notice that any slope selections for Butterworth (-3dB) and LR (-6dB) are down the same amount of dB at the frequency you pick. The only thing that changes is the Q of the curve.

Except for LR 6 and 18 which go to -3db