Measure ur room noise without any sound playing with the SPL meter.

No it depends on ur own environment. If ur room is quite well soundproofed, then it could be lower.

In my case, during the day, it is around 55dB. At night shd be less. Also if u have the air con on during measurement, then u shd measure the floor noise with it to understand the effect of it.

Yerp, just like anfielddude said, floor noise differs, typical living room would be around 50dB-60dB, got that in my room too.

I see. I did measure my room using the CM140. At night, when there is little external noise it is about 40-41 dB (this is everything turned off).

wow, 40dB is quite low. the next thing you will find the aircond quite noisy, he he

btw, is CM140 goods until 20kHz? then, you can measure the front speaker liao.

This post has been edited by gocitygo: Oct 10 2009, 09:24 PM

Yeah, the air-con is now the weak point in terms of noise

According to specs, the CM140 is good up to 8kHz.

Sorry for the noob question. For the yammy 665, lowest manual GEQ is 63hz. But in the absence of lower GEQ, only way to correct the response would be room correction or purchase of svs - EQ1? Or buy an AVR with better GEQ? How low does Audessey allow to adjust?

Audyssey does not allow manual adjustment of the EQ. So you will not see any equalizer bands for Audyssey that are user selectable.

However, I understand that Audyssey can adjust down to 20Hz (or maybe even lower).

No AVR with better GEQ would allow you to manually equalise that low.I don't think AUdyssey ESq1 allows manual adjustment(correct me if I'm wrong), try sms1 or behringer if you would like to tweak the values manually.

Tks. Alternative to tat method would be like gocitygo and get an auto eq sub, e.g Velo CHT-10/12Q? Which so far from his graphs are impressive.

OT a bit, 665 GEQ also has quite a large gap between 2.5khz and 6.3khz and straight to 16khz. Am having problems solving spikes above 5khz from all speakers, which is obvious when running linear sweep test tones from REW. Would sifus know how to tame/correct those spikes or am using the wrong tones to test?

Can u post ur charts and how u took the measurements? I'm curious. Also the RS SPL Meter is not known to be accurate past 5kHz.

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Added on October 10, 2009, 11:12 pmCM140 is spec'ed to 8KHz but its calibrated at the factory and tests comparing to a calibrated mic have shown accuracy up till 20kHz.

This post has been edited by anfieldude: Oct 10 2009, 11:12 PM

gocitygo's response is good due to a couple of things, room treatment and Audyssey.

Yammy's YPAO is generally not as highly regarded as Audyssey.

I think RS performs crappy-ly at sub range.. that's why have to put so much weighing correction..

these things are more good for measuring relative loudness between speakers (when doing room correction/calibration between main/surround speakers) rather than getting accurate SPL readings of individual speakers....

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Added on October 11, 2009, 12:00 amthat's what I meant..

the floor is already set as 48dB from the Y axis of the graph.. (not at 0db) so when I said most of the bass has died down (meaning except 45,50 and 65hz) , it means just that.. most of it reached the noise floor i,e, 48db



This post has been edited by ar188: Oct 11 2009, 12:00 AM

Yeah, peasant here on both counts .

Measurements were just read off the meter as the linear sweep was played between 63hz to 17khz at 75dB for each channel. Was fluctuation between plus/minus 2dB up until 5khz when it went off the analog meter first above 80dB and later below 70dB around 9khz. Roughly the same response for the wideband pink noise played for each channel on the Avia II disc but not sure of the frequencies on those track as not stated.

Havent hookup the SPL meter to the soundcard yet, will try to do so soon.

Excellent!

Wow, until 20kHz.....sui.

How muchie is CM140?

I think it is between USD130-USD140. Maybe u can snag one for slightly lower if u really look.

gocitygo's acoustic treatment is impressive With the many bass traps and acoustic treatment, it does eliminate most of the acoustic issue normally found in room.

I agree with you o the YPAO. It's proven with my previous FR chart. nothing much can be done by YPAO esp 'valley'

Audyssey is good till 20Hz for sure.

I believe Denon amps allow u to see the Audyssey settings and u can further tweak them by copying them to a free input. It might only be avail in the ones with Audyssey pro (3808i and above I think). Maybe some Denon users can confirm

I think this explaination..