What is with 1 ohm??
11-04-2004, 02:53 PM
#11
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Both amps would theoretically be running at their limits, but the amp producing full power into the higher impedance would be passing less current through the output devices and rather providing more voltage to the speaker.
The 4Ohm amp has to supply 63.2V to the load to produce 1000W
The 2Ohm amp has to supply 44.7V to the load to produce 1000W
The 1Ohm amp has to supply 31.6V to the load to produce 1000W
The flip side is that the current requirement goes up for each.
In the same order, the supplied current to the load is 15.8A, 22.3A and 31.6A.
In terms of efficiency of the amplifier, more current passing through the outputs means more thermal loss and reduced efficiency.
An amp I am testing current is 86% efficient when making full power into 4Ohms, 82% when at 2Ohms and 74% when at 1Ohm.
I like using 4 Ohm loads....
The 4Ohm amp has to supply 63.2V to the load to produce 1000W
The 2Ohm amp has to supply 44.7V to the load to produce 1000W
The 1Ohm amp has to supply 31.6V to the load to produce 1000W
The flip side is that the current requirement goes up for each.
In the same order, the supplied current to the load is 15.8A, 22.3A and 31.6A.
In terms of efficiency of the amplifier, more current passing through the outputs means more thermal loss and reduced efficiency.
An amp I am testing current is 86% efficient when making full power into 4Ohms, 82% when at 2Ohms and 74% when at 1Ohm.
I like using 4 Ohm loads....
11-04-2004, 06:00 PM
#12
500 Watt CAFz'r
Join Date: Apr 2004
Posts: 756
K so this raises a question that I've been mulling in my head.
I have a 2 ohm DVC sub, hooked up to my 1200D amp at 1 ohm. If I were to buy a second 1200D amp, and hook one coil to each amp at 2 ohms... will I notice much of any difference?
I have a 2 ohm DVC sub, hooked up to my 1200D amp at 1 ohm. If I were to buy a second 1200D amp, and hook one coil to each amp at 2 ohms... will I notice much of any difference?
11-04-2004, 06:13 PM
#13
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It depends on what impedance the amp the makes the most power, and how much power you can supply the amp.
Lets assume that it makes full power at 1Ohm. When I tested the 2500D, it made 2.2dBW less at 4 Ohms than it did at 2, so we will subtract that and add the 3dB you would gain from adding a second amplifier. In theory, you would gain about 0.8dB of maximum out.
Now, to make that happen, you need to supply more current from the electrical system, free up more space for the second amplifier and hope that the driver itself isn't already operating in a state of power compression at the existing maximum power level.
Bottom line - not likely worth the effort - mathematically speaking.
Lets assume that it makes full power at 1Ohm. When I tested the 2500D, it made 2.2dBW less at 4 Ohms than it did at 2, so we will subtract that and add the 3dB you would gain from adding a second amplifier. In theory, you would gain about 0.8dB of maximum out.
Now, to make that happen, you need to supply more current from the electrical system, free up more space for the second amplifier and hope that the driver itself isn't already operating in a state of power compression at the existing maximum power level.
Bottom line - not likely worth the effort - mathematically speaking.
11-05-2004, 01:22 PM
#14
see some amps rate them as :
1 ohm X 1000
2 ohm X 1000
4 ohm X 1000 but to find an amp that would do this is very tricky because all amps are built differently the answer :
Phoenix Gold
U can wire them anyway u want , great for different testing with out switching amp , give or take a few watts though
VS conventional amps : lower the ohm load the more power it makes but some amps are regulated and if u go past a certain point , smoke gets in your eyes
[ November 05, 2004, 02:26 PM: Message edited by: King Dynasty ]
1 ohm X 1000
2 ohm X 1000
4 ohm X 1000 but to find an amp that would do this is very tricky because all amps are built differently the answer :
Phoenix Gold
U can wire them anyway u want , great for different testing with out switching amp , give or take a few watts though
VS conventional amps : lower the ohm load the more power it makes but some amps are regulated and if u go past a certain point , smoke gets in your eyes
[ November 05, 2004, 02:26 PM: Message edited by: King Dynasty ]
11-06-2004, 09:49 AM
#17
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Posts: n/a
The Phoenix Gold Xenon, JL Audio 'slash' series and the Clarion DPX1001.1 amps all use adjustable rail voltage systems. The first two amps sense the load impedance and adjust appropriately, the Clarion, for about half the price per Watt, requires you flick a switch, and it will go down to only 2 Ohms - I bought one to do the test reports with, so I can provide ~1000W into 4 or 2 Ohm loads to make the reports more consistent - and blow up more crappy woofers. Heh heh...
11-06-2004, 01:36 PM
#18
If I'm not wrong, some of the better amps (JL comes to mind) are also quite regulated; they'll make full output with a range of input voltages (11 to 14 V). I imagine this is quite handy. Also, I believe some of the better designed 2 ch amps (the Clarion DPX 1001.2 as mentioned) can be configured with more system flexibility in mind. By this I mean having an amp that does near 1000w at both 4 and 2ohm mono, 150w x 2(4ohm stereo), 300w x 2(2ohm stereo) and 500w x 2(1 ohm stereo), gives the installer quite a range of applications (i.e., mixed mode operation(s)) vs. a mono amp for example. But, as discussed above, some people get caught up in the 'numbers game'. Cheers...
[ November 06, 2004, 02:37 PM: Message edited by: timmyturtle ]
[ November 06, 2004, 02:37 PM: Message edited by: timmyturtle ]
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