GR 12's & NEO-10's?

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bdp24

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Re: GR 12's & NEO-10's?
« Reply #20 on: 27 Apr 2013, 03:08 pm »
Plus, Ric Schultz at EVS is making speakers with GR12-16FR's, Neo 10's, and Neo 3's. Not bargain priced, but cheaper than the Serenity's.

cab

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Re: GR 12's & NEO-10's?
« Reply #21 on: 27 Apr 2013, 03:46 pm »
Seems he is talking about making them. Has anyone seen them?

emailtim

Re: GR 12's & NEO-10's?
« Reply #22 on: 27 Apr 2013, 05:15 pm »
"... How about 6 GR Research 12 inch servo woofers per channel mounted on their own baffle.  Driven by two servo amps per channel. ..."

Talk about plenty of Dipole bass !!!

bdp24

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Re: GR 12's & NEO-10's?
« Reply #23 on: 28 Apr 2013, 03:33 am »
Seems he is talking about making them. Has anyone seen them?

Only on his website, unfinished. Triple layer MDF baffles, like I did for my stacked-Quad stands.

bdp24

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Re: GR 12's & NEO-10's?
« Reply #24 on: 28 Apr 2013, 03:38 am »
"... How about 6 GR Research 12 inch servo woofers per channel mounted on their own baffle.  Driven by two servo amps per channel. ..."

Talk about plenty of Dipole bass !!!

Would be easy to do with the new 400w/400w dual-channel Rythmik plate amp. 3-12's per side is enough to keep up with my Quad ESL's. Now if I had some efficient horns.....

AlliumPorrum

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Re: GR 12's & NEO-10's?
« Reply #25 on: 28 Apr 2013, 08:59 am »
Thanks for all the replies until now!
Does the servo functionality somehow reduce the significance of the moving mass? I mean; Mms fo the 12" is over twice the Mms of the 8", and I think in the "traditional" bass driver without a servo that would make a great difference on the basses resolution and speed. But how is this with GR's; is there any significant difference between them?

Or hey, why not take best of both worlds; three 8's in line for the range 60 - 250hz, and 12's below and above them for the 20-60hz (12-8-8-8-12) ;=) 

jparkhur

Re: GR 12's & NEO-10's?
« Reply #26 on: 28 Apr 2013, 02:24 pm »

studiotech

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Re: GR 12's & NEO-10's?
« Reply #27 on: 28 Apr 2013, 03:12 pm »
Only on his website, unfinished. Triple layer MDF baffles, like I did for my stacked-Quad stands.

Link?

AlliumPorrum

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Re: GR 12's & NEO-10's?
« Reply #28 on: 28 Apr 2013, 04:35 pm »
Would be easy to do with the new 400w/400w dual-channel Rythmik plate amp. 3-12's per side is enough to keep up with my Quad ESL's. Now if I had some efficient horns.....

How many drivers can this new amp drive? Could it even handle 6 pieces of 8-inchers per channel, i.e. one amp could handle both channels?

HAL

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bdp24

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Re: GR 12's & NEO-10's?
« Reply #30 on: 28 Apr 2013, 08:52 pm »
How many drivers can this new amp drive? Could it even handle 6 pieces of 8-inchers per channel, i.e. one amp could handle both channels?

The amps can handle anything down to around 4 ohms (which is also where their maximum output is), so one 4 ohm driver, two 8 ohm drivers, or three 16 ohm drivers per amp channel.

Danny Richie

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Re: GR 12's & NEO-10's?
« Reply #31 on: 28 Apr 2013, 08:57 pm »
Quote
Does the servo functionality somehow reduce the significance of the moving mass?

Moving mass is a fixed physical element. However, the servo control system does add a considerable amount of stopping force. So setting time is considerably faster than an uncontrolled driver.

Quote
I mean; Mms fo the 12" is over twice the Mms of the 8", and I think in the "traditional" bass driver without a servo that would make a great difference on the basses resolution and speed. But how is this with GR's; is there any significant difference between them?

Moving mass still makes a difference.

Quote
Or hey, why not take best of both worlds; three 8's in line for the range 60 - 250hz, and 12's below and above them for the 20-60hz (12-8-8-8-12) ;=)

Filter extension settings on the new amps for the 8" woofers have 20Hz, 30Hz, and 40Hz settings. So one could pull them back a bit and use larger 12" servo subs to cover the ranges down into the teens. 

Quote
Would be easy to do with the new 400w/400w dual-channel Rythmik plate amp. 3-12's per side is enough to keep up with my Quad ESL's.

Whenever they become available that will be great.

bdp24

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Re: GR 12's & NEO-10's?
« Reply #32 on: 28 Apr 2013, 09:35 pm »
Danny---Since three of your 16 ohm 12's per side is plenty for me (crossed-over at 80hz to my stacked double Quad 57's)---infact, two might be enough---I don't need the new amps. I got a pair of the A370's to drive the 12's, pairs of which I'm buying as I prepare to build H-frames (with sand-filled side panels, the idea for which I got first from your 12-04 sandbox design, and then from Perry R's great jukebox-looking Super-V's) to put them in. But for others whose main speakers have more output than mine, the new dual-channel 400's might be just the ticket for a super-dynamic bargain priced world-beater! 

AlliumPorrum

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Re: GR 12's & NEO-10's?
« Reply #33 on: 30 Apr 2013, 02:20 pm »
The amps can handle anything down to around 4 ohms (which is also where their maximum output is), so one 4 ohm driver, two 8 ohm drivers, or three 16 ohm drivers per amp channel.

Can't they be connected in parallel or series?

Danny Richie

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Re: GR 12's & NEO-10's?
« Reply #34 on: 30 Apr 2013, 03:00 pm »
Can't they be connected in parallel or series?

Voice coils can be paralleled but all of the sensing coils have to be in series. You can parallel driver coils until you get down to 4 ohms and that's it.

AlliumPorrum

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Re: GR 12's & NEO-10's?
« Reply #35 on: 30 Apr 2013, 04:48 pm »
Ok. But wouldn't actually 4 drivers with 16 ohms be 4 ohms..?

Danny Richie

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Re: GR 12's & NEO-10's?
« Reply #36 on: 30 Apr 2013, 05:05 pm »
Ok. But wouldn't actually 4 drivers with 16 ohms be 4 ohms..?

DCR is about 13.9 ohms per woofer. So three of them get you to 4.63 ohms. Brian says the amps will handle the 3.4 ohm load but they could run a little hot on them. I'm for being a bit more conservative. Three per amp is good.

AlliumPorrum

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Re: GR 12's & NEO-10's?
« Reply #37 on: 30 Apr 2013, 05:11 pm »
I understood that these new amps are Hypex (UCD?) based? If so, even 2 ohms shouldn't be a problem, and 4 drivers per channel should be possible. But how is it..?

Danny Richie

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Re: GR 12's & NEO-10's?
« Reply #38 on: 30 Apr 2013, 05:14 pm »
I understood that these new amps are Hypec (UCD?) based? If so, even 2 ohms shouldn't be a problem, and 4 drivers per channel should be possible. But how is it..?

Brian has some new Hypec based amps in the works, but all of these A370PEQ's are just like the older ones. They are all a class A/B amp.

MarvinTheMartian

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Re: GR 12's & NEO-10's?
« Reply #39 on: 30 Apr 2013, 10:30 pm »
Or hey, why not take best of both worlds; three 8's in line for the range 60 - 250hz, and 12's below and above them for the 20-60hz (12-8-8-8-12) ;=)

I asked Brian this Jan.

I am assuming the new hypex amps are completely dual mono after the single power supply.
If the servo feedback circuits are truly isolated.
c] Is it be possible to run both SW-12-16FR and SW-8-16FR off of the same dual mono plate amp?
d] With a bit of soldering would it be possible to have different x-over and extension setting for each channel?

Thinking way outside the box ... Shawn

Brian
The servo feedback circuits are truly isolated. But we use the trick of pseudo complementary (or BTL) so that there are always equal (or similar) amount of current drawn from the positive and negative power supply caps. If you mix drivers, that condition of pseudo BTL is no longer true. All of advantage is lost. In short, we don’t recommend mixing different drivers on our dual mono amps.

Dang N'amit
Great minds think alike, fools seldom differ.
Shawn