Originally Posted by derrickdj1
Bill, I understand what you are saying. Some avr's , for example the Pioneer SC models don't let you set the LP filter. In that case should the avr be xo somewhere around 80 and the sub xo
all the way up. Using the LPF and the sub xo
may cause some interference and lower the sound quality?
OK, lets firm up the terminology here to be sure we're all speaking the same language. There is no such thing as a "sub xo" in the AVR. It is difficult to understand your question when you use this terminology.
Here is what there is:
on the main channels. A crossover consists of both a High Pass Filter, (HPF), on the speakers and a Low Pass Filter, (LPF), on the sub(s). Both of these filters are set together
; they CAN NOT be adjusted independently. For example, if you set an 80 Hz crossover on the L and R main channels, both the HPF and the LPF are set at 80 Hz. If you move the crossover to 100 Hz, they BOTH move to 100 Hz. The crossovers should be set based on the LF capabilities of the speakers, and the upper frequency capability of the sub(s).
2. LPF of LFE
. This is not a "crossover" because it is ONLY a LPF, and it is ONLY applied to the LFE channel. It has NO EFFECT on the bass that is redirected to the subwoofer output. It ONLY affects the LFE channel. Older AVR's, (pre lossless codec AVR's), may not have this feature. Also, if the content you're listening to doesn't have an LFE channel, this filter will not be applied to anything. Even if you are listening in "stereo" with the Bass Management turned on, the bass that is re-directed to the sub will not be exposed to the LPF of LFE because it doesn't originate in the LFE channel.
3. Subwoofer Controls.
* LPF. There may be another LPF built into the subwoofer. This filter can be set independent of anything set in the AVR. The "conventional wisdom" is to bypass these filters or to set them as high as possible to get their effect out of the way. However, Bill's advice in this thread to cascade these filters with the LPF of the crossover in the AVR to reduce localization, seems to be a good idea. It may be able to be used with higher crossovers to reduce localization of the subwoofer. In general, I would not use these types of filter unless localization of the sub is an problem. Then I would set it to the highest frequency that helps with the problem, and I would never set it to a lower frequency that the crossover frequency of the speakers in the AVR.
* Crossover. There may be a crossover built into the subwoofer. This should only be used when NOT using the Bass Management in the AVR. If you are using the BM in the AVR, disable or bypass the crossover in the sub.
Hope that helps.
CraigEdited by craig john - 1/26/13 at 6:50am