Brand New NSD Pre and Post EQ First Pass

[azjimmy]

Hello all,
Just noodling around with REW today, post NSD driver upgrade on my PB12ISD/2.
I ahd a few issues with REW getting a good input volume, so I had to jack the volume on my receiver to +12.5. I think it might have to do with the deivers for my soundcard (Audigy 2 ZS Laptop PCI card). I'm still working that out.
These measurements were taken using my R/S meter. Next time I'm going to do the ECM8000/UB802 combo. I was just feeling a bit lazy.

This is Pre-EQ



Post EQ

REW Came up with 6 filters. I added 3, one at 22 Hz to tame a bit of that hump,one at 58HZ to give a slight boost and one at 87 to do the same.
Here are my filters

FRQ Gain BW
1. 160 +8 -8 2
2. 20+8 -3 4
3. 125-4 -6 1
4. 100+8 -5 1
5. 63-8 5 2
6. 80-9 -6 9
7. 100-2 -6 7
8. 125-6 -4 1
9. 80+4 6 1

Comments? Suggestions?
Thanks
Jim

[Sonnie]

Hey Jim... you bout don't need a BFD. Excellent pre-eq'd response.... one of the best I've seen. If it wasn't for that little pesky peak at 72hz... you'd be set.

You might check it with your mains and see if that little blurp at 140-150hz causes any cancellation issues with your mains.

[brucek]

you bout don't need a BFD. Excellent pre-eq'd response

That's for sure. I would have someone turn your filters on and off for a blind test to see if you could actually tell the difference.

Then I'd remove the BFD.

brucek

[Sonnie]

Seems like we've got someone lookin' for a used BFD... I sense one coming up for sale.

[azjimmy]

OK,
I got off my butt and got out the mic and mixer. I ran this one with the front left main connected. I didn't pull the BFD out of the loop, just switched it to bypass. I did re-calibrate the sub to the system with no filters.



It's a little worse. I have a huge hump from 60-90 and a couple of drastic suck-outs over 100 and some smaller ones at 28 and 58.
I bet alot of this is room placement/room treatment.
Jim

[Sonnie]

Where's your crossover set between your sub and mains?

I think your sub level is way too low in relation to your mains.

[azjimmy]

Ooops
I forgot I had a door open...here it is with all doors closed


Jim

[azjimmy]

Sonnie,
I have it crossed at 80Hz, mains set to small. I set the level with the Rat Shack meter to 75 db like the mains. I always figured that that would bet 2-3db hot, given the low leveel error of the SPL meter. Am I bass-ackwards on that?
I do see what you mean, though. My level with the sub should be much higher...
My mains are JBL S38II's. They are rated to 45Hz.
Thanks for the help BTW...
Jim

[Sonnie]

Generally speaking I think most people will like a much hotter low end response, probably at least 10db hot and sometimes more. I'm not referring to a house curve for your bass response, but rather more of a whole house curve.

We generally speak of house curves for our bass response only around here... gently rising 8-10db from 80-100hz to 30-40hz and leveling off on down to 20hz and below. Even if we were to keep that area flat, I would believe a hotter overall bass response would be better.

Wayne wrote a pretty good article on all this here.

I can't say everyone would necessarily like it this way, but it seems to be more popular and natural for most people.

[azjimmy]

Ok,
I adjusted to sub level to be more in line with my mains. I think this a bit closer to what you were talking about.


This is with it crossed at 60...



And at 80...certainly less of dip at 80.



Looks like that dip almost goes away at 100. I dunno. now I feel like I'm shooting in the dark

Jim