posted
Does anyone know if RF internal crossovers shift the inputs current phase angles at the output of the amp... ...I have first order passive crossovers on my in dash speakers and am going to utilize my amps internal crossovers for my components and subs, I need to know what is happening on the output of the amp so I won't have any phase problems between the speakers Any help would be appreciated...
posted
I'm pretty out of the loop here, but they're 12db/o crossovers and therefore I think induce a 180^ shift.. Maybe I'm thinking of the wrong thing.
ShadowStar
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Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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posted
Ok, passive x-overs shift phase, electronics do not. Your first order passives will shift 90 degrees. The output of your amp should have the left channel phase inverted, but that does not mean it's out of phase.
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posted
Thanks for the info... One more question would I be better of making a 24db/oct passive crossover for my component set and in dash speakers or would I be better of using a 12db/oct setup due to the 24db/oct's ability to more or less attenuate the output signal of the amp or is it even noticeable. Thanks ...
quote:Originally posted by Audiophyle: Ok, passive x-overs shift phase, electronics do not.
Any transfer function that has a butterworth, chebychev, linkwitz-Riley etc 1st, 2nd.... nth order response is described by a 1st, 2nd....nth order equation. It doesn’t matter whether it’s passive or electronic, the transfer function is mathematically identical for both. Therefor, the phase is the same. Electronic does have many advantages over passive though. But for 1st order highpass, they are all the same, a capacitor.
Tommot, I wouldn’t worry about phase too much except at low frequencies (bass). Just don’t mix anything 180 degrees apart at the same frequency. As far as perfectly time and phase aligning (same thing pretty much) your front speakers (tweets and mids) I wouldn’t think your gonna get to close without a good program like leap software. Different speakers will have slightly different phase Reponses. I don’t know how much though. I don’t have the software. Some one on here probably does and could tell you.
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Posts: 1259 | From: Fullerton. CA ,USA | Registered: Oct 1999
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posted
Also, Don’t even think about building a 24dB/oct passive crossover. I don’t know why they even put that stuff in books. You will never achieve the Q's necessary and the tolerances are way too great. Basically, You will never get a good frequency response out of them. It will be ugly, not to mention a little lossy.
------------------ 2-DD 9512's 2-2000X's (for now) 8.0ft^3 box in a civic trunk One big ass port ?????dB's
It's not the size of your woofer, It's the size of the waves your woofer makes!
Posts: 1259 | From: Fullerton. CA ,USA | Registered: Oct 1999
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