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8240 monitor lacking lower bass

mswain, modified 12 Years ago.

8240 monitor lacking lower bass

Youngling Posts: 3 Join Date: 7/27/09 Recent Posts
Just purchased the 8240 DSP monitors with GLM software last week .
I heard the 8030 and 8050 in the store and seem to have a solid large bass sound down to 50-60 hz range

When I listen to the 8240 at home, they seem to lack lower bass below 100 hz.

just wondering if the 8240's are flat below 100 hz.
below 100 hz bass really starts to drop.

I'm going to try the audio analyzer tonight.

Thanks
Mike
1038, modified 12 Years ago.

Re: 8240 monitor lacking lower bass

Jedi Master Posts: 340 Join Date: 4/6/09 Recent Posts
Hi Mike,

Have you installed and setup GLM yet?

I have installed many 8240 systems, in most rooms you will them them flat to down around 30Hz. Phenomenal performance for a 6' 2 way :D

IFrom the main page click on "GLM System Setup" then click on "Edit Acoustical Settings"now click on the "Interactive Response Editor" It will provide you with a plot with traces for in room response (red), Filter settings (blue) and optimised response (green). If you need to see more resolution you can simply change the "Y-scale to 5dB/div.

Hope this helps.

Cheers

Steve
mswain, modified 12 Years ago.

Re: 8240 monitor lacking lower bass

Youngling Posts: 3 Join Date: 7/27/09 Recent Posts
Thanks Steve,
I have the GLM software. I try it this week.
The $4000 Sencore SP495 audio analyzer show's the 8240 remarkably flat through the audio spectrum until below 100 hz .

db level drops starting at 100 hz then slopes downwards
This test is without the GLM software
I do not have the sub
The Sencore SP495 was in TDA mode(removes room acoustics from measurement)
single 8240 speaker measurement was at 1.2 ft
Measured Speaker distortion was excellent around 1% @ 1 khz

Audio frequency db levels
0 db @ 178 hz
-7 db @ 80 hz
-9 db @ 72 hz
-10 db @ 67 hz
-11 db @ 63 hz
-17 db @ 50 hz
-19 db @ 48 hz
1038, modified 12 Years ago.

Re: 8240 monitor lacking lower bass

Jedi Master Posts: 340 Join Date: 4/6/09 Recent Posts
Hi Mike,

How is the speaker positioned in the room, could you upload a photo?

Extremely strange measurements, it is almost a linear attenuation.... I think something may be wrong with your measurement system? How does the system sound?

I have just finished calibrating 3 8240/7070 5.1 systems this morning. Studio environment, speakers over 3 metres from front or rear wall, we achieved 35Hz out of the 8240's, with a slight cancellation of about 7dB at around 60Hz.

Here is a screen capture from a recent trade show, we had limited space so we couldn't get the speakers on-axis which explains the plot, and a high noise floor when the calibration was performed. As you can see, great extension down to 30Hz



Hope this helps, we consistently see this extension.
mswain, modified 12 Years ago.

Re: 8240 monitor lacking lower bass

Youngling Posts: 3 Join Date: 7/27/09 Recent Posts
It looks like the problem is in the acoustics of the room, not in the speaker.
Tried moving the 8240 to the middle of the room.

The 8240 performed a lot better.

There is a 60 hz node in the mixing position.
60 hz disappears

will bass traps work?

Any ideas
1038, modified 12 Years ago.

Re: 8240 monitor lacking lower bass

Jedi Master Posts: 340 Join Date: 4/6/09 Recent Posts
Hi Mike,

Can you link a picture or describe how you have installed your speakers?

Cheers

Steve