posted
I was wondering if anyone who has done/seen this could help me out. How can I use 2 amps to power 3 DVC subs so that one amp pushes 3 coils in parallel, and the other doing the same for the other 3 coils? I am looking at 2 of Rockfords BD1000's and 12inch HX2's. Also, I've heard the BD1000's will do 1400watts, does anyone know more about these babys?
------------------ It may be old, but it can still SLAM!!
Posts: 34 | From: Canton, Mi | Registered: Jan 2000
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posted
Yeah, but is there anything specific I need to do to make this work? I was talking with a local installer and he said I'd need to invert (not just flip the RCA's) the signal to one of the two amps since the BD1000 is a mono amp.
I'd like to use 4 subs, but space does not allow it. Plus, I just like to do things different :-)
------------------ It may be old, but it can still SLAM!!
[This message has been edited by sonic (edited 02-29-2000).]
Posts: 34 | From: Canton, Mi | Registered: Jan 2000
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posted
your situation is a simple one. you can think of your pair of monoblocks as a single 2 channel amp (if done right it will behave the same way) you can run your subs in "stereo" (using both channels) with three voice coils per channel as you stated, if you do that there's nothing else you have to do. (just make sure you get all the +'s to the + terminals etc..) you could also bridge the amps together (I believe rockford includes a phase switch for doing exactly that) Depending on the impedance of your coils will determine how you want to load the amps, but in either situation make 100% sure you have a mono signal, or the sub that's got a coil on each amp will heat up alot if the coils are fighting (trying to move differently) with different signals.
------------------ 9 12's in the hatch of a golf
Posts: 735 | From: Calgary AB | Registered: Oct 1999
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Aside from the increased current output, there are NO sonic advantages to briding IMO. Were it me, I would run one or two subs per amp, stereo (one amp per channel) at their minimum load. Do the BD1000's have an inversion switch built in, or would an invertor module be needed? That adds another level to the question.
ShadowStar
------------------ Computers are a lot like air conditioners.. Open Windows and they become useless..
The day Microsoft makes something that doesn't suck is the day they make vacuums.
Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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posted
Increased current output? Meaning they could pump more power?
I don't know much about the details of the BD1000's yet since they aren't shipping. But if they won't do 1ohm loads, I'll have to get a 4th sub. I don't really want to do that though. I can't think of any way of wiring 3 DVC's (4 ohm coils) with 2 amps and not have a 1 ohm load for each amp. Any thoughts?
All my stuff is on back order since Rockford isn't shipping much of it's new stuff (like head units, HX2 subs). It is quite frustrating.
Thanks for all the help. This is great!
------------------ It may be old, but it can still SLAM!!
Posts: 34 | From: Canton, Mi | Registered: Jan 2000
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posted
When you bridge an amp, one channel inverts, doubling the voltage swing across the load.. when the load voltage is doubled, so is the current (ceteris parabis) therefore giving you more power. This causes the amps to run at a lower impedance (more current output, same voltage PER amp). I don't think that this is ideal, however the merits of having more power cannot be ignored, I prefer keeping that power at 4 ohm or so, although I am guilty of running two 250.1 amplifiers bridged on the same load for 1 ohm per amp... More power, argh argh argh :-)
I think those amps would do 1 ohm, but I have no knowledge of the matter, so don't take my word on it.
ShadowStar
------------------ Computers are a lot like air conditioners.. Open Windows and they become useless..
The day Microsoft makes something that doesn't suck is the day they make vacuums.
Posts: 2578 | From: Somewhere In the Northeast | Registered: May 1999
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posted
You CAN run one coil from each woofer in parallel to each amp. This puts 3 4 ohm coils in parallel per BD1000a1 which is not an impedance problem for this amp.
As suggested, try to gain them bery close in output. If you are unsure how, let me know.
------------------
And that's the bottom line, cuz: LORD DUKK SAYS SO!
The Big Show The Dukk says: Know your bass: PORT your damn box!! Have HoleSaw, Will Travel!
posted
SWEET! So I CAN run two amps on 3 subs, one amp per 3 coils. That will be sweet when I finally get those amps in. I was talking with my installer and 4 subs aren't gonna be a problem in my trunk, but it will be nice to spread the project out while I save up for the install and extra sub.
Thanks for all the help!!
------------------ It may be old, but it can still SLAM!!
Posts: 34 | From: Canton, Mi | Registered: Jan 2000
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posted
Hmmm, I might be missing something here, but I think theres an simpler and easier way to do this... If the coils on each speaker are wired in series, and the speakers are wired in parallel, the load is the same, correct?? Once the amps are bridged properly, it seems to me the system would be easier to set gains on since there would be no problems with coils fighting each other due to differences in input levels. Feel free to correct me here, but don't wait up for the reply....gotta get some sleep tonight for the Audio Thunder show tomorrow...
------------------ BigRedGuy Still bumpin' after all these years :) Kenwood/AudioControl/Orion/Orion/LightningAudio
quote:Originally posted by Dukk: Hey BRG - If you see a tall red head with glasses named Mike Pesdirz (Pez) in the Rockford/Korbon area, tell him Dukk says HI!
No probs, Dukk, but can the place handle 2 tall red-headed guys at once?...
------------------ BigRedGuy Still bumpin' after all these years :) Kenwood/AudioControl/Orion/Orion/LightningAudio
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