Earl, please send the 5 Nathans to the address you already have. Please paint them in matt white. Thanks.
gedlee said:
Like Markus said, unfortunately it's the most common situation, especially in apartments🙁
So, what is the reason you choose "face them forward not pointed at the listener" ? It's just opposite to what I'm doing! I point my speakers in a large toe in angle -- make thier axes cross in front of the listening position. It works quite well in delivering stable images and wide listening area.
It's also usually relatively short distance in such listening position. So I guess 2 speakers facing straight forward would not blend nicely in the center, wouldn't they?
It's been a while but I think I'm now finally done with setting up everything. Signal flow:
All connections are balanced.
Receiver: Denon DN-A7100
Crossover: Behringer DCX2496
Amp: 3 x Samson 120a
For the calibration process ( see post #3 ) you'll need:
- Microphone
- Mic Preamp
- Computer
- Realtime FFT Analyzer software
- White noise signal
Without subs (green) / with 3 subs (yellow):
🙂
An externally hosted image should be here but it was not working when we last tested it.
All connections are balanced.
Receiver: Denon DN-A7100
Crossover: Behringer DCX2496
Amp: 3 x Samson 120a
For the calibration process ( see post #3 ) you'll need:
- Microphone
- Mic Preamp
- Computer
- Realtime FFT Analyzer software
- White noise signal
Without subs (green) / with 3 subs (yellow):
An externally hosted image should be here but it was not working when we last tested it.
🙂
Markus
Not bad, but I might try moving the LP point of one of the subs up a bit as there does not seem to be much sub influence above 100 Hz. This MIGHT help since the worse problem is right at 100 Hz. and you should be able to fill in that hole. Is this spatial or frequency averaged at all?
Not bad, but I might try moving the LP point of one of the subs up a bit as there does not seem to be much sub influence above 100 Hz. This MIGHT help since the worse problem is right at 100 Hz. and you should be able to fill in that hole. Is this spatial or frequency averaged at all?
What about the biggest dip at around 170Hz? I have exactly the same issue in my set up. That is in the region above what the sub cares for and is a very difficult one.
How did you finally end up solving you inputs issue?
surely, the mains should extend to 170Hz?
col.
col, after testing and two more emails from Denon support they confirmed that the LF is routed to the mains when "sub" is set to "none". So I simply use 2 XLR Y-cables to split the R and L signal. That results in a 3dB gain loss. Nothing to worry about.
Now I have a brand new Rotel RMB-1085 for sale - so if anybody is interested... 🙂
Now I have a brand new Rotel RMB-1085 for sale - so if anybody is interested... 🙂
Earl, I'm not sure if I want the floor bounce but I definitely wanted a discussion about it. But it seems that all psychoacoustic experts are on vacation 
It is. Shouldn't it be frequency averaged at any time? Spatial average is only required when you need to capture more than one seat.
It is. Shouldn't it be frequency averaged at any time? Spatial average is only required when you need to capture more than one seat.
markus76 said:
Not true in general, but it depends. For subs only this is true up until the Schroeder Freq, but after that spatial averaging is always required.
If you use noise as the test signal then you should always do some frequency averaging as noise is not a stable signal and requires some averaging to converge.
I always do spatial and frequency averaging as it is the right thing to do when using noise as a signal. It never hurts to spatial average at the LFs.
Ah, I see now from the higher freq they're on the same absolute dB scale.
There's more aoutput from the yellow, but I still find it curious that the green is rising at very low freq.
There's more aoutput from the yellow, but I still find it curious that the green is rising at very low freq.
Don't know what you mean by "I see now from the higher freq they're on the same absolute dB scale".
Could be background noise which is pretty high. If I can get down to 30Hz then that's good enough for me. So that's what I was aiming for.
Could be background noise which is pretty high. If I can get down to 30Hz then that's good enough for me. So that's what I was aiming for.
" Post #537
Don't know what you mean by "I see now from the higher freq they're on the same absolute dB scale"."
Different FR plots on the same page are often arbitrarily separated for clarity, but since the green and yellow are essentially right on top of each other above 100 Hz, I assume that's not the case here.
Don't know what you mean by "I see now from the higher freq they're on the same absolute dB scale"."
Different FR plots on the same page are often arbitrarily separated for clarity, but since the green and yellow are essentially right on top of each other above 100 Hz, I assume that's not the case here.
For everybody that is interested in getting the bass right, I published a little tutorial that explains how to set up multiple subwoofers:
http://www.mehlau.net/audio/multisub_geddes/
Best, Markus
http://www.mehlau.net/audio/multisub_geddes/
Best, Markus
gedlee said:
I know that you recommend having a highly absorptive area behind the speakers.
I have covered the wall behind the speakers with heavy curtains. They are around 300 g/m2 which should be 8 or 9 oz/yd2. It is cotton woven in a not really tight way so that you can see some light coming through. The total length of curtain is almost double the length of the wall they cover and the curtains are at some distance from the wall/widows, between 4 to 6 inches.
Do you think this would give enough absorption?
If this is not, I am also considering doubling the curtains with wool felt around 1 or 2 millimeter thick.
Regards,
Etienne
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