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Old November 16th, 2004, 10:31 PM
yaz yaz is offline
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Does VT12 need an 80hz crossover to blend seamlessly?

I was looking at the Panasonic SA-XR50 receiver and noticed that it only had crossover freq above 100Hz. I have the VT12 and STF-2 for my speakers. I think the VT12 only goes down to 80hz. If I purchase this receiver will that mean I would have a gap from 80-100? Or will I have to disable crossover if possible and set it on the subwoofer? I am currently demo the Onkyo 502 with a 80hz crossover and the setup sounds nice. However the Panasonic is another receiver that I want to try out. Any suggestions on setting it up?
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Old November 17th, 2004, 9:32 AM
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Dudley Dudley is offline
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80 Hz is the reccomended crossover, but I know there are several members with pioneers that crossover higher (90 hz I think) that seem to be happy.

You run the risk of bass that is easier to localize if you crossover higher, but there will not be a hole in the sound.

Other things being equel I would go with the 80 Hz crossover. I don't really see any real advantage of the digital amp in the Panny (nor disadvantage). It is very slim though if you don't have much space.
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Old November 18th, 2004, 7:45 AM
yaz yaz is offline
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Thanks for the reply. So easier to localize means that it won't be seamless?
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Old November 18th, 2004, 8:25 AM
Retread Retread is offline
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Originally Posted by yaz
Thanks for the reply. So easier to localize means that it won't be seamless?
Different things.

Localization has to do with the directionality of the sound. Low audio is directionless. As the frequency goes up, the sound becomes directional, and one can identify the location of the source -- hence localization. You want the sub's upper frequency cut off to be low enough that you don't perceive sound coming from its location.

Seamlessness has to do with how flat the frequency response is. I have a Pioneer receiver. It has a crossover frequency of 100 Hz. However, that's the point at which the signal is down 3dB (i.e., half power). Rolloff begins at around 200 Hz. If the sub's crossover is set for 80 Hz (presumably also 3 dB point), then there will be some hole in the 80-100 Hz range. Even if the crossovers are at the same frequencies, there may not be a perfect match; the rolloff rates may be different.

I probably can't hear the 80-100 Hz hole in my system. And room effects are probably much bigger. But as an engineer, it irritates me just being there.
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