Hey,
I have 2 dvc infinity subs you can see the detail on them here.
http://www.infinitysystems.com/car/products/product_detail.aspx?prod=REF1252W&cat=REF&ser=REF&Language=ENG&Country=US&Region=USA
I was wondering why it says that they can run at 2 or 8 ohms for impedance. Cause I need to find an amp and I don't know how many ohms 1 coil is.
Thanks,
Vince
Replies (7)
kirchatndftbl on 04/30/2008 16:43:00
they are dual 4ohm subs
try to find a class d amp 600-800rms @ 1ohm
Ash on 04/30/2008 17:48:37
Each coil of the subs are 4 ohms. They can be wired several ways to achieve a desired ohm load between the pair. The most common will be series, parallel, or a combination of both when a pair is used. Check out this link for wiring details:
http://mobile.jlaudio.com/support_pages.php?page_id=161
DVC subs that are 4 ohms per coil usually are better when ran as a single sub when trying to use a class D amp. I say this for most class D amps of decent quality and lower in price often are maximized for 2 ohm loads. This holds true especially in the 300-600 continuous watt range.
Other options for a pair of dual 4's are running series/parallel on a 2 channel amp bridged. Not so good either as they often are class AB (not as efficient as class D).
Even for class D, running at 1 ohms usually is quite a bit of stress if cranked for too long. This doesn't mean ditch the subs, this just means be prepared to spend a little extra for a durable amp that will fit the power range & ohmic load that they require.
Here's some suggestions:
http://sonicelectronix.com/item_4334_DEI+-+Directed+Audio+D1200.html
Not sure if that amp is CEA certified, but it touts a 60 amp fuse rating so it can't be too far off from it's claims...
http://sonicelectronix.com/item_9927_Memphis+16-PR1.500.html
Close enough in power to make the subs perform although it's 100 watts shy. You may not hear the difference..... The latter amp doesn't seem to be CEA compliant either, but shows a 90 amp fuse rating, ouch! Doesn't mean you have to use it all if it's really there.....
http://sonicelectronix.com/item_7369_PowerBass+ASA-1000.1D.html
The Kenwood KAC 9103D is rated to be 1 ohm stable, however there is no power ratings for that load. At 2 ohms it claims to put out 900 rms even though it's fuse rating is only 60 amps. CEA compliant as well? Must have a heckuva power supply.... Still never heard any complaints on them.
http://www.crutchfield.com/S-v0zrZYoJGzI/App/Product/Item/Main.aspx?I=113KAC9103
So you see what we are looking for when picking out a amp for your subs, it may just take a little patience. I'm sure others here will chime in. If you could find an older model JBL BP600.1, that would be perfect for them and they are rock solid. Only problem is that they are only available used though they still are often sold on Ebay...
Ash,
Apocalyptica on 04/30/2008 19:54:34
I realized that they were 4 ohm per coil after I posted lol. As for running them at 4 ohm or 1 ohm, I have seen many diagrams using these methods, but I was wondering if someone could go over the math, because all I can find is premade diagrams online, not how to calculate it yourself, just curious. Thanks for the replies kirchatndftbl and ash.
Vince
Ash on 04/30/2008 21:33:07
The math part is pretty simple with impedance. You are either going to double or half when combining dual voice coils. What matters is knowing the final impedance (ohm) that will result and finding a suitable amp that will match the power needed at the ohm load presented.
It will take some good searching, for 2 ohms right now is pretty much the standard. Normally 1 ohms is run within competition systems. This can readily be seen in the number of mono amps that won't go below 2 ohms despite the power ratings nor quality of brand.
Personally, I usually reserve dual 4's for bridging 2 channel amps because the options there are better than finding 1 ohm stable amps. When wanting to run at 2 ohms, two single 4 ohm subs or dual 2 ohms are better suited. The available 2 ohm stable amp wattage ratings vary a lot while the 1 ohm amps are kind of limited.
Hifonics amp are purported to be pretty good for the money and sound strong. Many of them are rated to do 1 ohms. Their downfall is that when the fuse ratings are checked, they don't necessarily match the claimed ouput. However, one with a fuse rating of at least 60 amps might prove worthy. Anything lesser would be kind of pushing it a bit.
Apocalyptica on 04/30/2008 21:41:38
Ash, If you hook both the coils and speakers up as parallel its a 1 ohm load, but if you connect the coils in series and the speakers in parallel you get 4 ohms, correct? Well what would happen if you connected both the coils and speakers in series? Just curious. Thanks for your help.
newB on 05/1/2008 01:55:26
that would be 4+4 = 8 (x2) = net 16 ohm load
on a side note i really like the infinity woofers
two thumbs way up!
-Drew
Apocalyptica on 05/1/2008 10:09:59
Thanks Drew, I wish they were for me, but I'm installing them for a friend. I just wanted to make sure I had my facts straight. It is definately going to be better than the system I installed in my car. Lol.
I have 2 dvc infinity subs you can see the detail on them here.
http://www.infinitysystems.com/car/products/product_detail.aspx?prod=REF1252W&cat=REF&ser=REF&Language=ENG&Country=US&Region=USA
I was wondering why it says that they can run at 2 or 8 ohms for impedance. Cause I need to find an amp and I don't know how many ohms 1 coil is.
Thanks,
Vince
Replies (7)
kirchatndftbl on 04/30/2008 16:43:00
they are dual 4ohm subs
try to find a class d amp 600-800rms @ 1ohm
Ash on 04/30/2008 17:48:37
Each coil of the subs are 4 ohms. They can be wired several ways to achieve a desired ohm load between the pair. The most common will be series, parallel, or a combination of both when a pair is used. Check out this link for wiring details:
http://mobile.jlaudio.com/support_pages.php?page_id=161
DVC subs that are 4 ohms per coil usually are better when ran as a single sub when trying to use a class D amp. I say this for most class D amps of decent quality and lower in price often are maximized for 2 ohm loads. This holds true especially in the 300-600 continuous watt range.
Other options for a pair of dual 4's are running series/parallel on a 2 channel amp bridged. Not so good either as they often are class AB (not as efficient as class D).
Even for class D, running at 1 ohms usually is quite a bit of stress if cranked for too long. This doesn't mean ditch the subs, this just means be prepared to spend a little extra for a durable amp that will fit the power range & ohmic load that they require.
Here's some suggestions:
http://sonicelectronix.com/item_4334_DEI+-+Directed+Audio+D1200.html
Not sure if that amp is CEA certified, but it touts a 60 amp fuse rating so it can't be too far off from it's claims...
http://sonicelectronix.com/item_9927_Memphis+16-PR1.500.html
Close enough in power to make the subs perform although it's 100 watts shy. You may not hear the difference..... The latter amp doesn't seem to be CEA compliant either, but shows a 90 amp fuse rating, ouch! Doesn't mean you have to use it all if it's really there.....
http://sonicelectronix.com/item_7369_PowerBass+ASA-1000.1D.html
The Kenwood KAC 9103D is rated to be 1 ohm stable, however there is no power ratings for that load. At 2 ohms it claims to put out 900 rms even though it's fuse rating is only 60 amps. CEA compliant as well? Must have a heckuva power supply.... Still never heard any complaints on them.
http://www.crutchfield.com/S-v0zrZYoJGzI/App/Product/Item/Main.aspx?I=113KAC9103
So you see what we are looking for when picking out a amp for your subs, it may just take a little patience. I'm sure others here will chime in. If you could find an older model JBL BP600.1, that would be perfect for them and they are rock solid. Only problem is that they are only available used though they still are often sold on Ebay...
Ash,
Apocalyptica on 04/30/2008 19:54:34
I realized that they were 4 ohm per coil after I posted lol. As for running them at 4 ohm or 1 ohm, I have seen many diagrams using these methods, but I was wondering if someone could go over the math, because all I can find is premade diagrams online, not how to calculate it yourself, just curious. Thanks for the replies kirchatndftbl and ash.
Vince
Ash on 04/30/2008 21:33:07
The math part is pretty simple with impedance. You are either going to double or half when combining dual voice coils. What matters is knowing the final impedance (ohm) that will result and finding a suitable amp that will match the power needed at the ohm load presented.
It will take some good searching, for 2 ohms right now is pretty much the standard. Normally 1 ohms is run within competition systems. This can readily be seen in the number of mono amps that won't go below 2 ohms despite the power ratings nor quality of brand.
Personally, I usually reserve dual 4's for bridging 2 channel amps because the options there are better than finding 1 ohm stable amps. When wanting to run at 2 ohms, two single 4 ohm subs or dual 2 ohms are better suited. The available 2 ohm stable amp wattage ratings vary a lot while the 1 ohm amps are kind of limited.
Hifonics amp are purported to be pretty good for the money and sound strong. Many of them are rated to do 1 ohms. Their downfall is that when the fuse ratings are checked, they don't necessarily match the claimed ouput. However, one with a fuse rating of at least 60 amps might prove worthy. Anything lesser would be kind of pushing it a bit.
Apocalyptica on 04/30/2008 21:41:38
Ash, If you hook both the coils and speakers up as parallel its a 1 ohm load, but if you connect the coils in series and the speakers in parallel you get 4 ohms, correct? Well what would happen if you connected both the coils and speakers in series? Just curious. Thanks for your help.
newB on 05/1/2008 01:55:26
that would be 4+4 = 8 (x2) = net 16 ohm load
on a side note i really like the infinity woofers
two thumbs way up!
-Drew
Apocalyptica on 05/1/2008 10:09:59
Thanks Drew, I wish they were for me, but I'm installing them for a friend. I just wanted to make sure I had my facts straight. It is definately going to be better than the system I installed in my car. Lol.
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