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3 questions about my new 8240/7260 setup?

dumbo, modified 11 Years ago.

3 questions about my new 8240/7260 setup?

Padawan Posts: 78 Join Date: 12/20/09 Recent Posts
I just got a 7260 and am in the process of setting it up with a pair of 8240s (in stereo configuration). I'm using the GLM system/software and am puzzled by the autophase (step 5) instructions. If I understand correctly one arbitrarily picks a speaker to play the reference tone to set the phase is set up for the sub. Why does one only phase align the sub with respect to one of the speakers? When I run the autophase step using the left speaker as reference I get a phase correction of -150 degrees and when I run it with the right speaker as reference I get -135 degrees. Which do I use and why isn't the correction averaged between the two?
* If I used the left and right speakers (both playing the test tone at once) to phase align my 5040/6010 desktop setup should I go back and do it again with only one speaker?

Also, I'd like to be able to use this system in 2 configurations:
1) stereo (with no sub so I don't drive the neighbors batshit)
2) stereo with the sub (for no holds barred listening)
I'd like to be able to switch between the two and have the GLM apply the appropriate correction for either situation.
I'm sure this is explained somewhere in the manual so if you could tell me where to look I can probably sort it out (is it under "groups"?)

Finally, why is that when I used the 8240s alone to listen to commercially recorded CDs the red light overload indicators regularly flashed (indicating that the CD was hitting 0db) but...
With the 7260 inserted the overload indicators aren't being tripped at all.
ilkka-rissanen, modified 11 Years ago.

Re: 3 questions about my new 8240/7260 setup?

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
I just got a 7260 and am in the process of setting it up with a pair of 8240s (in stereo configuration). I'm using the GLM system/software and am puzzled by the autophase (step 5) instructions. If I understand correctly one arbitrarily picks a speaker to play the reference tone to set the phase is set up for the sub. Why does one only phase align the sub with respect to one of the speakers? When I run the autophase step using the left speaker as reference I get a phase correction of -150 degrees and when I run it with the right speaker as reference I get -135 degrees. Which do I use and why isn't the correction averaged between the two?

-150 or -135 doesn't really matter at all. They are so close that getting any difference between them would be difficult even with accurate measuring gear, not to mention human ear. So you can pick either one. The correction isn't averaged between the two.


Also, I'd like to be able to use this system in 2 configurations:
1) stereo (with no sub so I don't drive the neighbors batshit)
2) stereo with the sub (for no holds barred listening)
I'd like to be able to switch between the two and have the GLM apply the appropriate correction for either situation.
I'm sure this is explained somewhere in the manual so if you could tell me where to look I can probably sort it out (is it under "groups"?)

The easiest way to bypass the subwoofer is to click the "Bypass BM" button in the GLM main windown (next to the "Mute All" button). When the button is red, it means that the subwoofer is bypassed and the main speakers are playing the full range signal. The AutoCal calibration is still valid and correct even though the subwoofer is bypassed.

If you want to have two different setups that you can switch, you need to go to the "GLM System Setup", select the subwoofer unit and click "Edit Input Settings", answer "yes", deselect left and right from the "Bass Management/Channel Selections", click "ok", answer "yes". Save that setup as a new setup with a different file name.


Finally, why is that when I used the 8240s alone to listen to commercially recorded CDs the red light overload indicators regularly flashed (indicating that the CD was hitting 0db) but...
With the 7260 inserted the overload indicators aren't being tripped at all.

When there is a subwoofer in the system, the overload indicators aren't being triggered anymore, but of course the digital level from the source to the subwoofer is still the same. This is not a failure in the system or in the setup.
dumbo, modified 11 Years ago.

Re: 3 questions about my new 8240/7260 setup?

Padawan Posts: 78 Join Date: 12/20/09 Recent Posts
Thanx so much Ilkka,
I very much appreciate your prompt response. I'm delighted with my new sub mated with the awesome 8240s so I really appreciate the tips that will let me use the system in both full range and monitor only configurations. I love how logically everything is setup in order to provide the best performance and flexibility. No wonder Genelec is so well respected in the pro world. Just one other question. I probably didn't set up my desktop system properly. The instructions call for using the center channel to play the reference tone and set up the sub phase. It was a pain to change my cabling around so I used both channels playing the test tone. Should I go back and do it again and if so, couldn't I just shut off one speaker and use the left or right?
ilkka-rissanen, modified 11 Years ago.

Re: 3 questions about my new 8240/7260 setup?

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi,

I answered to your question there:

viewtopic.php?f=13&t=260
dumbo, modified 11 Years ago.

Re: 3 questions about my new 8240/7260 setup?

Padawan Posts: 78 Join Date: 12/20/09 Recent Posts
Thanx again. :^)
dumbo, modified 11 Years ago.

Something doesn't sound right.

Padawan Posts: 78 Join Date: 12/20/09 Recent Posts
Ilkka,
Are you absolutely positive that playing the system in Bypass puts the 8240s into full range mode. I tried the 8240s in bypass and they sound positively anemic to me and seem to be rolling off at the 85hz crossover point. Something really doesn't sound right because, before I threw the sub in the 8240s were really very satisfying on their own.
dumbo, modified 11 Years ago.

Maybe I changed a setting somewhere by accident?

Padawan Posts: 78 Join Date: 12/20/09 Recent Posts
At one point I tried the "symmetrical" setup but then realized it wasn't the appropriate setting.. I believe I had to create a "group" and even though, since then I've done another complete calibration, I wonder if something held over which is messing up my Bypass mode.
ilkka-rissanen, modified 11 Years ago.

Re: Something doesn't sound right.

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Ilkka,
Are you absolutely positive that playing the system in Bypass puts the 8240s into full range mode. I tried the 8240s in bypass and they sound positively anemic to me and seem to be rolling off at the 85hz crossover point. Something really doesn't sound right because, before I threw the sub in the 8240s were really very satisfying on their own.

Hi,

I am absolutely positive that the bypass mode should work as described. Can you run a new full system setup with 8240As only? I.e. leave the subwoofer disconnected (network).