A Couple Dumb Measurement Questions

[mikie]

My first question is about the smoothing adjustment on the Filter Adjustment tab. What smoothing adjustment is recommended?

Second question is a bit harder to ask. I'm passing the REW signal to the multi-chanel sub input on my receiver (Pioneer Elite 56Txi). I have an IB sub with no cross-over. When measuring the sub I noticed that it produces measurable output to around 2000 Hz. I assume that under normal circumstances the sub signal into the receiver would not go this high so it's an oddity due to my measurement method. This brings me to my question. With an 80 Hz cross-over the REW target curve is about -40dB at 200 Hz. When adjusting sub response with the BFD should I bring the subs output down to the target curve or should I keep sub response flat?

Thanks -- Mikie

[brucek]

What smoothing adjustment is recommended?

Usually a 1/6 or 1/3 octave smoothing is recommended to more closely approximate the nature of human hearing. You just won't hear those sharp spikes you see in the response, so we usually smooth them out a bit so it's more representative of how you'll hear the sound.

I'm passing the REW signal to the multi-chanel sub input on my receiver

Normally we inject the REW signal into a AUX or CD input and set the crossover of the sub to its normally used value (i.e. 80Hz) with the receiver in stereo and the mains speakers disconnected. Then we select the target crossover that matches what is selected in the receiver.

In your case I don't know if you're using the multi-channel input only for REW (in which case you shouldn't), or this is the normal uncrossed method you regularily use for your sub. Why don't you have your sub low pass crossed?

Anyway, if you normally use your sub without a crossover, then you can design one into the BFD with filters....

brucek

[mikie]

Thanks Bruce. I guess it's time to crawl back behind the equipment rack & move wires around REW's a great tool & I want to use is properly. -- Mikie