another poison for you guys with such geng sub is audyssey sub equaliser such as SVS AS-EQ1 subwoofer EQ (coming soon). Room correction for sub is much more important as low wave freq had long standing wave.

Don't compare with 10R. After you listen to those very "geng" sub, all entry level "beh lalu"

For me, only reason to get PS3 as compared to standalone player is to play games. If you don't play games then standalone player (a good one) is probably better.

heres part 1, all the pictures were taken by a Hong Kong
friend when he was here visiting some of our local HT n
audio setups. hehe dun mind if the rm not chio looking ok

front view


front view


side view


ceiling view


ceiling view


rear ceiling view with projector in the foreground

Yes Jchong, the sound from the plaster ceiling is very irritating. Mind you by damping certain section will never solve the problem unless you redo the whole ceiling by adding more aluminium structure. I have gone thru this by adding this and that somehow in the end i give up so i convert it into audio room where no boom boom kaboom. I think the best solution is try to avoid plaster ceiling if you can unless if your HM insist then you will never enjoy the booom booom sound. Somehow i always remind my kids never to pump too loud if not their eardrum might suffer the same fate as mine.

Preliminary look at the Rythmik F15

Thanks to some test tones and a SPL meter borrowed from a forummer (you know who you are  ) I managed to chart the in-room freq response of the F15 vs the CHT-12Q.



As you can see the F15 digs down to 10Hz in-room!! And it's fairly flat from 10-32Hz. By comparison the 12Q falls off rapidly below 32Hz and is basically inaudible from 25Hz and below.

So what does 10Hz sound like? Well I can't hear it. I can only start hearing some pulsations about 14Hz upwards (and this is probably due to the vibration of things in the room rather than the test signal itself). And at the test level of 80+ dB it's not powerful enough to really rattle the room. I've not tried pushing it higher yet.

Playing back a few scenes from Kung Fu Panda, the F15 is certainly tighter than the 12Q. It doesn't rumble as much. On the 'skidoosh' scene the explosion is more palpable and I can hear the bass textures as the explosion ripples across the screen (on the 12Q the bass was less defined). Yet, strangely on some scenes like when Tai Lung falls from the sky the rumbly nature of the 12Q seems to add more punch. Need to do more tweaking, especially how to use the parametric EQ on the F15.

The meter was about 3.1m away from the sub.
No, didn't cut it at 50Hz. The roll off must be due to the room I think (some nulls or holes). Now got to find way to correct for the room acoustics to balance out the area from 45-80Hz.

I'll push the sub more later once it's broken in.
Yup, I'll need to factor in the correction next. I did download the CM-140 cal file from REW.

As for REW I was itching to use it but realised I don't have everything yet, e.g. some of the cables. Particularly, I saw the note about not using the mic-in on the notebook, so it seems I might need to buy an external usb sound card too? When you used REW did you plug straight into the notebook or used an external sound card?

If you don't cut it, then it's weird it roll off quite drastic after 50hz. Normally peak and valley due to room interaction you should have several peak and valley but never roll off in your graph. The roll off is almost 20db which is too much. Even an equalizer can't help you much here if the drop off is too much. You can try some bass trap here.

Yeah, I know it's quite weird. Scratching my head how to counter it because like you said even equalizer might not be enough since the drop is so much.

As for bass trap, that only helps to reduce peaks right? Can it help to boost up valleys?

Yes, the front speakers don't receive below 40Hz and instead it goes to the sub  i.e. 0-40Hz goes to the sub

Your're playing an mp3 which does not have the .1 channel so there's nothing for the sub to play.

So, you're measuring only 0-40Hz for the sub which got cut from the front speakers.

Does it work that way? i.e. setting front to 40Hz means only 0-40Hz goes to the sub? I thought the sub is governed only by the LFE setting.

anfieldude, you have the 876 also, does setting the front to 40Hz means only 0-40Hz goes to the sub?
Yes, the MP3 doesn't have a .1 channel or any multichannel info, so the AVR outputs the same signal equally to all speakers incl the sub. When I play the test tones to only the sub I can hear the signals from 45-101Hz (though at different loudness).
Yup planning to do that next. One thing, it is only a stereo line out to the AVR's CD input. In this case will the 876 output this signal to the sub? What mode do I have to set the 876 to in order for it to output to the sub? Otherwise I'm afraid stereo line out means going to the front speakers only.
Actually Audyssey even set my fronts to full band, but I changed to 40Hz. Current using PSB T55 which -3dB freq response is spec'd at 32Hz. That's why I set to 40Hz. Is there any difference if I set it higher than 40?

You guys are right. 

When I changed the fronts to 80 Hz I do get more output from the sub. However, the peaks and valleys are still in the same places, so those are probably due to the room.

Note: in the chart below, the correction factors for CM-140 have been applied.

[attachmentid=1096544]

thanks bro... maybe bro anfieldude will lend me his

bro u can use mine..  it is with anfieldude now.. but if rosak kena ganti balik that's the only condition... it is quite useful.. when your wife screams at u n reach 75db u can tell her  'darling u hit refrence level without bottoming out'

guys pls relax n calm down if u wanna talk to logit.. u need to do alot of homework to be able to deal with him..

-be prepared to not understaand a word he said
-be prepared to hear the same comments from him even after 10 times pointing out to him his view is wrong
-be prepared to see some Logitech subs being compared to ht subs
- if u really wanna communicate with him, pls read n study his previous posts, u have to really understand this character n behaviour then only u will have fun discussing with him.

for example mpyw if u wanna ask him whether he as listen to svs b4 u have to ask it this way-
'bro logit svs good for movie loud battar musics loud too 1300watts but good loud music movies u try b4'

sounds like magic...

so the purpose to get a flat graph is so the bass effect is constant throughout the room?

No lah. AV Synergy not far away. But, it is closed due to Raya. Same goes to Audio Perfectionist.

Finally, I shifted this to my room. It took 3 persons to lift it.

guys if u r having a bad day pls look at this... he is not alone .. i promise u u will laugh till u drop if u read this thread.. it is quite long but very very funny http://forum.lowyat.net/topic/827903  ... he speaks in the same language with our fren lgitech... both chasing the same dream and have the same taste too .. they are definately from the same clan.. both using the words 'listering' and 'battar'..

Please remove my name from sub-owner list...

I am officially Sub-less since 2.30pm just now....

Anybody know where i can get either VELO CHT-10Q or CHT-10R in Kedah or Penang , what's  the price range anyway.....

TQ