AudioCircle
Industry Circles => GR Research => Topic started by: Danny Richie on 14 Mar 2010, 05:20 pm
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The new SA-1 amp is a sub-woofer plate amp that was designed to be used to power subs in an open baffle or sealed box configuration.
(http://www.gr-research.com/mis/SA1.jpg)
This little amp will output 200 watts into 4 ohms and 110 watts into 8 ohms.
It is also very small and will fit on the back panel of even a narrow shaped speaker. It measures only 7.125" wide and 10.625" tall.
It has a removable IEC and will work with 110 to 120 volts or 220 to 240 volt power.
It also has high level and low level inputs.
The really unique thing about this amp is the output response. I had a circuit designed that would mirror image the roll off of a sealed box or open baffle design.
See my measured output:
(http://www.gr-research.com/mis/amp%20output2.jpg)
The Red line is the measured output of the amp that I use with my Clio.
The Green line is with the crossover set all the way up. The Purple line is with the crossover setting about half way up. And then the Blue line is with the crossover turned all the way down.
As you can see, with this amp, you can get a -3db in the low 20's with the right open baffle woofers or sealed box woofers. It is also ideal for use with our SW-12B woofers: http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=131
There is also a high pass filter built in to keep from over driving the sub with information below 20Hz.
Here is a factory made measurement:
(http://www.gr-research.com/mis/factorymeasured.jpg)
The Red line is with the crossover turned all the way up and the Purple line is with it turned all the way down.
Amps are in stock and are $129 each.
These amps will also be the amps that come with the new V-2 loudspeaker kit seen here: http://www.audiocircle.com/index.php?topic=71532.0
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Danny,
That amp looks fantastic and the price to performance ratio is the best I have seen in a very long time..........like ever. :eyebrows:
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This looks pretty cool. :)
I just spent five minutes window shopping at parts express after reading this. How about a sealed Neo 2x with one of these sealed in the bottom?
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-864 (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-864)
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I just spent five minutes window shopping at parts express after reading this. How about a sealed Neo 2x with one of these sealed in the bottom?
That will work fine, but that is a pretty small woofer. And with that high Fs and low Qts it isn't going to play very low even with this amp.
For not much more money you can side load one of these: http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=131
Like this: http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=118
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Maybe actively drive a pair of those Anarchy drivers from the other thread? Not that the SW-12B is bad in any way, but I'm just thinking on how to keep the speaker footprint as small as possible (because that 7x10-ish amp size just has me thinking about the idea of a real "sleeper" of a small floorstander in the bass department. :D).
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If you side load the larger woofer then you still keep a really small foot print.
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Are you going to offer the subs for the V2 or do you have limited supply and need to save those for the V2 kits? Same value proposition as the SW-12B versus SW-12.
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Are you going to offer the subs for the V2 or do you have limited supply and need to save those for the V2 kits? Same value proposition as the SW-12B versus SW-12.
Yeah, I guess I could. I'll price them at $75 a piece and if I sell out of them then I'll buy another pallet load.
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I don't know if everyone missed this, but Danny just said he is selling a dual OB sub with amp for $279 plus shipping. :thumb:
Okay, I am going to clear out my queue and give one a try. Just happens to match the pennies that I have saved. :green:
Yeah, I guess I could. I'll price them at $75 a piece and if I sell out of them then I'll buy another pallet load.
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So, any designs on an N-4? :thumb:
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Any idea what sort of bass this amp could make with four (4) M165X drivers?
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Any idea what sort of bass this amp could make with four (4) M165X drivers?
That's a good question. I have not tried it.
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Hey Danny, what credit cards do you take? It isn't listed on the website and I don't recall offhand.
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Everything except American Express.
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One SA-1 amp and two eminence subs coming my way. Looks like I have a project for next weekend. :D
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Any idea what sort of bass this amp could make with four (4) M165X drivers?
Now that's what I'm talking about!
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Danny,
Now that the V2 amps have come in, what is the availability of a V2 flat pack?
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Now that the V2 amps have come in, what is the availability of a V2 flat pack?
I have everything in stock needed to ship out kits now. The only real hold up is me drawing out the cabinet plans in a professional manner so that someone besides me can follow it.
After I get that done then any number of these cabinet shops can get you a quote on a flat pack.
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Hey Danny, I've become more interested in these amps after you reco'd them in my OB thread a while back. What would the usable upper requency be for this amp? I seem to remember you recommending a 180Hz high pass FMod coming in above this amp in the V2. I have some vintage 12's that I would like to use to sort of emulate your V2 design and put the vintage 15"s that I have laying around in some Wbaffles.
Thanks,
Erik
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What would the usable upper requency be for this amp?
200Hz no problem.
I seem to remember you recommending a 180Hz high pass FMod coming in above this amp in the V2.
On the V-2 the upper coaxial can play wide open. Just the natural roll off in open baffle will allow it to cross right in the 180Hz range. I used some F-mods that were rated as second order high pass filters (70Hz) just to increase power handling by removing those low frequency ranges.
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Thanks DAnny.
Erik
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Danny
Are you going to put this one on your website or is it there somewhere?
Dave
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Are you going to put this one on your website or is it there somewhere?
I will (at some point) get it up on the website.
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Hey Danny,
I am just getting around to playing with my SA-1 / Eminence subs. Just curious why does the negative lead from the amp have such a small connector? The positive lead fits the sub perfect, but the negative lead is much too small.
Also, does the LFE input bypass the lowpass cutoff? Just wondering which input to use with a mono out.
Thanks.
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I will (at some point) get it up on the website.
Hi Danny.
Not having your SA-1 amps on your website, makes you loose potential sales, you know that already of course.
I bought four (04) of those SA-1 amps and I am anxious to see what they can do ?
Dayton Audio (Part Express) has some similar units in the same price range, but since I am in Vietnam, it makes more sense to consolidate all my purchases from Danny and also I like to do business with small business, because the owner care about the satisfaction of the customer.
Guy 13.
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Is this all still using the servos? Or is this intended to be a cheaper alternative? If so what would the difference be between this and a couple of your H frame subs? Will there be plans available for us non engineers?
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Is this all still using the servos? Or is this intended to be a cheaper alternative? If so what would the difference be between this and a couple of your H frame subs? Will there be plans available for us non engineers?
Hi Clark.
I am not sure if that question is for me od for danny, but I will give my opinion anyway.
The SA-1 amplifiers is not for servo drivers and yes, it is intented to be a lower price alternative.
The SA-1 amplifier is standard with the V-2 and can be used with any drivers in any configuratuion U or H frames.
For the plans I saw them somewhere on GR - Audio Circle thread.
Danny can fill in anything I forgot and correct anything that not correct.
Guy 13.
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hey thanks guy 13, so this amp can drive a pair oneach side.... I wonder if you even need servo when ob
hey Danny..
Do you think I might (with these amps) be able to turn my set of Brahma 15's into ob subs that could work with the n3 in my room? And if so, what do you think the advantages or disadvantages? Whaddya think? I could save a lot of money as I already have the drivers.
If this could work well for me then subs are covered at 129 each amp plus flatpack etc. The magnets on the Brahmas are monstrous however and I wonder if it would cause issues with the audio gear, especially the tube buffer in the Sensation... ?
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I am just getting around to playing with my SA-1 / Eminence subs. Just curious why does the negative lead from the amp have such a small connector?
It is typical that a lot of woofers have a smaller terminal for the negative contact.
Also, does the LFE input bypass the lowpass cutoff? Just wondering which input to use with a mono out.
The LFE input by-passes the entire crossover and shaping circuit to send a full range signal to the woofer.
For mono operation you can use either input.
Not having your SA-1 amps on your website, makes you loose potential sales, you know that already of course.
Yeah, as soon as I get caught up on shipping out orders then I can work on the web site again.
Dayton Audio (Part Express) has some similar units in the same price range,
Nope, they don't have anything with an output that is designed to be the inverse of the roll off of an open baffle or sealed box.
Is this all still using the servos? Or is this intended to be a cheaper alternative?
A very low cost alternative.
If so what would the difference be between this and a couple of your H frame subs? Will there be plans available for us non engineers?
This amp is ideal for open baffle applications using woofers in H, U, or W frame types. It also is the amp used with our V-2 (Venuette) kits.
I wonder if you even need servo when ob
I don't really need a Corvette, but I want one.... The servo control on our SW-12-16FR woofers is a whole new performance level.
Do you think I might (with these amps) be able to turn my set of Brahma 15's into ob subs that could work with the n3 in my room? And if so, what do you think the advantages or disadvantages? Whaddya think? I could save a lot of money as I already have the drivers.
You'll still be a long way from servo control performance levels, but this amp would be a good amp to use on them in an open baffle application.
The magnets on the Brahmas are monstrous however and I wonder if it would cause issues with the audio gear, especially the tube buffer in the Sensation... ?
Not unless you are setting that gear on them.
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Ok ok. Cross that bridge when I get to it, but good to know. Thanks!
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I now have the amp on our web site and available for on line orders.
http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=156
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Hi Danny
Confused with the pricing. At the beginning of this thread you have something for $129.00. On the web link it's $249.00. Is that for a pair then?
Thx
Dave
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Corrected now. Check again. :D