Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems Room correction issue

I ran the room correction program for the G68 and it did tighten up my bass response. Unfortunately it also left it a little light and bright. I assume this is because my calibration was impacted by large room resonences which are now attenuated. How do people recalibrate their speakers after room correction? Shouldn't the G68 recalibrate itself since by definition filters will reduce bass output?

I'm also getting huge suckouts 20db+ at 125 and 200 Hz in my sub and front speakers. How should I fix this? I really don't have anywhere else to move my fronts although I could move my sub?

What decay time did you set? Many people, myself included, have manually defined a range of decay times. I have defined 100ms to 300ms in 25ms intervals. I settled on 225ms as my preferred choice. When doing this, you only need to take one measurement, then just rebuild the filters at the appropriate decay times. A word of advice, build the filters in the order that you intend to have them on the display.

-Ian

Auto targeted almost 500ms and created only 2 filters, with most materials I couldn't hear it. I also manually set 250 and 300ms and those tightened up the bass but lowered the levels significantly. They don't help with the large cancellation effects at 125hz and 200hz.

Try a target time of 185 msec, or rerun the analysis.

500msec seems like a very long target RT60, and I'm finding best results around 185msec in my 21' (6.4m) x12' (3.7m) x7' (2.1m) space.

Is it possible that you are used to boomy / overly reverberant bass? I haven't found a need to alter levels with MRC engaged.

Cheers,

Quote "Is it possible that you are used to boomy / overly reverberant bass?"

John, you bring up a good point!

At first listen after smoothing bass response in a room a lot of people wonder where all the bass went.

Listen to it that way for a while and try listening to different disc's before you go making changes right away. After a day or so you may find the bass just right.

That being said, sometimes when two or more room modes are very close to each other trying to level the response may affect adjacent frequencies that don't need to be attenuated. Thus with some bass lines, depending on the music, you may be missing something. That's why I say try different music with different bass lines. It may point to excessive reduction at some frequencies. A sign wave sweep can also pin point lost bass regions.

Regards,

Ron

MRC can't correct a suckout, you have to move the speakers or yourself to correct.

Stacey raises another good point.

MRC addresses peaks, not nulls. You can throw essentially infinite power into a null without making a bit of progress.

Cheers,

Has anyone produced an idiots guide to RC? The manual explains running the process, but it would be great to have some more sample graphs with covering explanations, and what actions are required to 'fix' certain issues.

I'm still learning, so not in a position to author this myself, but I'll gladly create the PDF is someone can provide the facts...

More confusion. MRC shows a 20db null at 200hz but the stereophile test CD shows my response flat at 200hz. Am I missing something?

Are you measuring both from the same position ? Also, I guess you're measuring levels with the test CD and MRC is measuring decay time.

Rgds

Nick