New sub-woofer for GR Research! See pics and specs.

Rory B. · « **Reply #40 on:** 12 May 2004, 01:55 am »

As loathe as I am to question an obviously very experienced speaker designer like Brian Cheney, wouldn't the drivers with their very different electromechanical parameters make any bass loading design a very poor one at best? Everyone knows you don't take two different types of drivers and load them to a box, because they will have different resonant frequencies that need to be controlled by the port. One driver will have an uncontrolled resonance, or one driver will have its way with the other, or various other problems. This doesn't agree with standard T/S theory.

zybar · « **Reply #41 on:** 12 May 2004, 01:58 am »

Rory,

Have you listened to Brian's subs?

If you had, you wouldn't be asking the question.

I have two Larger subs and think they are very, very good.

George

azryan · « **Reply #42 on:** 12 May 2004, 06:31 pm »

Rory,

Since you're asking Brian C. a question you should be asking it on his forum and not here.

Good luck getting a straight answer too.

Danny Richie · « **Reply #43 on:** 12 May 2004, 07:33 pm »

I don't think he is asking a direct question to Brian.

I believe he is questioning his design, and his questions are quite educated.

Marbles · « **Reply #44 on:** 12 May 2004, 08:05 pm »

I don't own the VMPS larger sub, but I heard one extensively a year ago at the Midwest Audiofest. I spent most of the weekend in the Bolder/Teres/8th Nerve room guarding a mini keg of beer

The larger was one of the best musical subs I've heard. Wayne from Bolder set up the room using an 8th Nerve roompack. He also used an EQ on his QMS sub amp set with some RTA laptop program.

I suspect that the Larger sounds so good because of the very large internal volume as well as the additional mass (mortite) loaded onto the passive radiator. I"m guessing this additional mass might make the passive SEEM much larger than it really is.

Why two different size active drivers can mesh so seemlessly, I haven't a clue....but they sure seemed to me that they did. Again, maybe it is the "tuning" using the mortite on the passive that helps with this.

Al Garay · « **Reply #45 on:** 13 May 2004, 05:36 am »

GR-CustomAction
GR-Accelerator
GR-SOX

I've been spending too much time with software development. But the terms work.

Al

azryan · « **Reply #46 on:** 13 May 2004, 05:48 pm »

Sorry,

I just didn't want to see another designer get pulled into this forum. Obviously Rory wasn't directly asking Brian C. the question since he asked it here, but it seemed like a trigger to a big can of worms.

Just trying to help steer things a bit to keep them cool and in appr. places.

Hank · « **Reply #47 on:** 18 May 2004, 05:24 pm »

Hey, I just found this thread! Good ideas, Danny. Best of luck with it and I recommend you experiment with a dipole line array.

Here's my name suggestion: The GR Zeuss "GR Research provides your complete speaker needs from A to Z, Alpha to Zeuss!"

What's the prize?

JoshK · « **Reply #48 on:** 18 May 2004, 06:52 pm »

How about Zed?

Beta
Beat-a

How about GR Research Pandora's?

jonwb · « **Reply #49 on:** 18 May 2004, 09:38 pm »

Quote from: Hank

Here's my name suggestion: The GR Zeuss "GR Research provides your complete speaker needs from A to Z, Alpha to Zeuss!"

What's the prize?

Hey, I like that Hank! Kinda goes along w/ the whole "masters of the universe" theme

Of course Danny could go with the old classic, "Widow-maker". Or, given the fact that this product is designed to make a lot of loud booming sounds, you could call it the "Home-wrecker".

Hank · « **Reply #50 on:** 19 May 2004, 05:53 pm »

Thanks, Jon. Following your theme, just be right up front and call it:

The GR Research DECREE

Danny Richie · « **Reply #51 on:** 25 May 2004, 09:05 pm »

Here's a finished pic in a good old Black textured box.

The PR is on the opposite end from the woofer.

The box is heavy braced 3/4" MDF with a double layer front baffle for the woofer to mount to. Then lined with Blackhole 5, of coarse!

I am very pleased with the sound. It plays deep, smooth and very musical, but the real surprise was that it hits pretty hard too.

RAW · « **Reply #52 on:** 26 May 2004, 12:38 am »

looks good Danny,
Can not wait till they arrive

RAW · « **Reply #53 on:** 4 Jun 2004, 05:49 pm »

Ok now just waiting for the Driver and PRSS.
Cut for new 360 watt amp with remote.

Andrikos · « **Reply #54 on:** 4 Jun 2004, 06:26 pm »

Oh yeah, another question.
I was considering your suggestion of using 6 of each of the woofers and PRs. Can the PR's be mounted at the bottom of the box?
If not, that would be a showstopper for me...
Thanks,

Danny Richie · « **Reply #55 on:** 4 Jun 2004, 06:42 pm »

Quote

Can the PR's be mounted at the bottom of the box?

The suspension of the PR is fairly stiff. I don't think down firing the PR will be a problem.

Just keep it up off the floor a little.

doug s. · « **Reply #56 on:** 4 Jun 2004, 06:46 pm »

Quote from: RAW

Ok now just waiting for the Driver and PRSS.
Cut for new 360 watt amp with remote.

what'as the third round hole for, if using one active & one passive?

thanks,

doug s.

doug s. · « **Reply #57 on:** 4 Jun 2004, 06:48 pm »

Quote from: Danny

Here's a finished pic in a good old Black textured box.

The PR is on the opposite end from the woofer.

The box is heavy braced 3/4" MDF with a double layer front baffle for the woofer to mount to. Then lined with Blackhole 5, of coarse!

I am very pleased with the sound. It plays deep, smooth and very musical, but the real surprise was that it hits pretty hard too.

ok danny, how much $$$ for a complete kit?

thanks,

doug s.

Danny Richie · « **Reply #58 on:** 4 Jun 2004, 07:01 pm »

I'm not sure what subs fit the box Al pictured.

That may be something he made for an 8 and a pair of PR's.

I am going to introduce the 12" woofer and PR for $144.

I may offer an amp for it at some point in the future.

For sure, I'll offer a Black textured box through Al that will not be very expensive.

RAW · « **Reply #59 on:** 4 Jun 2004, 07:55 pm »

The 12" and twin PRS not a single.
I have made this exact cabinet for a customer as well for the XLS12" with twin CSS 10" PRs.
May even get a head to head with Dannys and twin PRS as well.Time frame comes into play.

Al
This twin PR single driver from GR will be for a design I am going after.
Smaller 1-1.5cft cabinet.