[glaufman]

and prayed to all Shack Moderators.

I did NOT receive my prayer!:hissyfit:

that the noise level is increasing as the session goes on.

Not sure exactly what you mean here... the sound level will increase as your magnepans come into their FR...

Next time you get a few scans in and it quits, quickly go around feeling things to see if anything's getting warm.

 

[hrpschrd]

I did NOT receive my prayer!:hissyfit:

Not sure exactly what you mean here... the sound level will increase as your magnepans come into their FR...

Next time you get a few scans in and it quits, quickly go around feeling things to see if anything's getting warm.

I don't follow "magnepans come into their FR". Are you talking about the low bass?
Anyway, it seems to me that the last graph is lower intensity and just looks noisy. Then it quit.

Odd results too: #1 and #3 are WITH bass trap behind the L main; #2 was WITHOUT bass trap. #4 and #5 are moving the L main to the left and right 6".

By the way Greg, if you didn't get a prayer, how come that redhead gave you a double-take today??http://www.hometheatershack.com/forums/images/smilies/heehee.gif

 

[hrpschrd]

PROBLEM SOLVED!

From the last experiments I suspected the SPL meter and sure enough; replaced it and all works reliably. I want to thank all the many writers that helped narrow this down. An intermittent electrical problem is the worst and most frustrating.

THANKS ALL. With a fixed tool I can now fixate on the acoustics!http://www.hometheatershack.com/forums/images/smilies/t.gif

 

[glaufman]

I don't follow "magnepans come into their FR". Are you talking about the low bass?

Yes.

By the way Greg, if you didn't get a prayer, how come that redhead gave you a double-take today??http://www.hometheatershack.com/forums/images/smilies/heehee.gif

I assumed she had to. That was my wife! How'd younkow I like redheads?

PROBLEM SOLVED!

From the last experiments I suspected the SPL meter and sure enough; replaced it and all works reliably. I want to thank all the many writers that helped narrow this down. An intermittent electrical problem is the worst and most frustrating.

THANKS ALL. With a fixed tool I can now fixate on the acoustics!

Excellent! My next step was going to be changing cables and such (starting with the cheap stuff)...
Are you interested in trying to fix the old one?

 

[glaufman]

Odd results too: #1 and #3 are WITH bass trap behind the L main; #2 was WITHOUT bass trap. #4 and #5 are moving the L main to the left and right 6".

So you're getting a worse dip WITH the trap than WITHOUT? Hmmm...
I suppose it could be coincidence with a faulty meter... maybe try that test again with the new meter?

 

[Moonfly]

PROBLEM SOLVED!

From the last experiments I suspected the SPL meter and sure enough; replaced it and all works reliably. I want to thank all the many writers that helped narrow this down. An intermittent electrical problem is the worst and most frustrating.

THANKS ALL. With a fixed tool I can now fixate on the acoustics!http://www.hometheatershack.com/forums/images/smilies/t.gif

Not sure if this applies to you, but if the meter bangs of its limits a lot (clips) it will mess it up. It can also happen if it gets left on and picks up sounds that cause it to clip too.

 

[hrpschrd]

Ok, Greg you caught me. The real story is that I changed batteries. The old battery was in the lower edge of acceptable so I was lazy and didn't replace it. With the new battery, voila. I suspected that during measurements the battery was draining off.

BTW, the reason I guessed you liked redheads was that you are not Tiger Woods.

I am posting new graphs in Home Audio Acoustic Forum, and yes, the no trap is still better. And my big null is nullified when I add in the R speaker and move the LP slightly back. Moving the L around made it worse! It is so nice having a measurement tool working again. This is really fun.

 

[Moonfly]

No Worries :T. We all do that from time to time :R

 

[glaufman]

Ok, Greg you caught me. The real story is that I changed batteries.

Oh well, I thought I was going to be a hero later when I suggested that one. Or got me a free meter...:whistling:

 

[glaufman]

Not sure if this applies to you, but if the meter bangs of its limits a lot (clips) it will mess it up. It can also happen if it gets left on and picks up sounds that cause it to clip too.

Interesting info... I wasn't aware of that...

 

[Moonfly]

Ive never done it myself, but have been warned a couple times from others that constant clipping knackers the meters up. Occasional is ok though, it happens. I suppose its just like with amps and speakers, and doing your best to make sure you dont overdrive them.