Power question, ALPINE PDX
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From: Western, NY
Originally Posted by RollingRock
The subs i have are 2 ohm DVC
The audio head I was talking about was a dude at my office....he said i was getting 600 per sub, i said 300
The audio head I was talking about was a dude at my office....he said i was getting 600 per sub, i said 300
Anyway.. In your case:
(2) DVC-2 drivers can equal either 0.5- or 2-Ohm final loads. So make sure you wire the coils in series and the drivers in parallel because the PDX is not 0.5-Ohm stable.
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From: Slidell, LA
Originally Posted by 051fdrof
It is the same amount of current to each speaker in a series or parallel circuit, provided that all of the speakers are the same impedance. Normally the difference is the total amount of current, but the PDX amps have identical 2 Ohm and 4 Ohm specs so they must compensate internally for 2 Ohm loads. They won't give you any extra from bridging, either.
When wiring two speakers in series the impedance of each speaker is added together to come up with the load on the amp.
When wiring in parallel, (assuming both speakers are the same impedance) you divide the speaker impedance by the number of speakers.
(2) 4 Ohm speakers in parallel = 2 Ohm load
(2) 4 Ohm speakers in series = 8 Ohm load
The lower the load on the amp, the higher the current draw. (unless you're a PDX, apparently)
When wiring two speakers in series the impedance of each speaker is added together to come up with the load on the amp.
When wiring in parallel, (assuming both speakers are the same impedance) you divide the speaker impedance by the number of speakers.
(2) 4 Ohm speakers in parallel = 2 Ohm load
(2) 4 Ohm speakers in series = 8 Ohm load
The lower the load on the amp, the higher the current draw. (unless you're a PDX, apparently)
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From: Western, NY
Originally Posted by Low_e_Red
I call BS!
a) It does the same power @ both 2 and 4 Ohm loads
b) It only has one channel anyways. There's nothing to bridge!
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From: Nebraska
Originally Posted by Low_e_Red
I call BS!
And you ARE correct...........I wasnt for sure myself (pretty much no experience with the PDX amps myself) so I had to look, but I figured they had more output bridged.
Straight from the Alpine website. (4.150 for example)
RMS Power (at 14.4V THD+N,20Hz-20kHz)
• Per channel into 2 ohms : 150W x 4 (<=1%THD+N)
• Per channel into 4 ohms : 150W x 4 (<=1%THD+N)
• Brigded 4 ohms: 300W x 2 (<=1% THD+N)
• Per channel into 2 ohms : 150W x 4 (<=1%THD+N)
• Per channel into 4 ohms : 150W x 4 (<=1%THD+N)
• Brigded 4 ohms: 300W x 2 (<=1% THD+N)
I assume we (and 051fdrof) is/are talking about the PDX amp in general, and that we are all smart enough to know that you cant bridge a mono anywho....
Just to try to stop this from turning into an "I know more than you" thread, although those can be fun
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Originally Posted by Bartak1
I assume we (and 051fdrof) is/are talking about the PDX amp in general, and that we are all smart enough to know that you cant bridge a mono anywho....
Just to try to stop this from turning into an "I know more than you" thread, although those can be fun
Just to try to stop this from turning into an "I know more than you" thread, although those can be fun
since when cant your bridge a mono amp????
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From: Nebraska
Originally Posted by scottbigred
since when cant your bridge a mono amp????
Ohh man, did you miss the memo????? They just changed it a few days ago....big red print "THERE SHALL BE NO MORE BRIDGING OF MONO AMPS". Big dissapointment for me I tell ya
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From: Slidell, LA
Originally Posted by Bartak1
Ohh man, did you miss the memo????? They just changed it a few days ago....big red print "THERE SHALL BE NO MORE BRIDGING OF MONO AMPS". Big dissapointment for me I tell ya
I am up for a I know more thread tho....
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From: NY
Okay... I was referring to the fact that you don't gain any more power by bridging the outputs of the (multi-channel) PDX amps. If you look at the specs for a 4.100 you'll see that the bridged output is just the sum of the two bridged channels. It is more output, but no more than using the two channels independently. An MRP-550 on the other hand, gets you 250 watts by bridging two 90 watt channels. That's why we all bridge our sub boxes.
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From: Western, NY
Hmm. Never did mention that I was a 'Know-it-all'. I simply stated facts about the amp that the OP is requesting the information about. Which I was pretty sure was the PDX-1.600 in which there are NO power gains from 'bridging' this amp. 
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Originally Posted by dB-SPL
Hmm. Never did mention that I was a 'Know-it-all'. I simply stated facts about the amp that the OP is requesting the information about. Which I was pretty sure was the PDX-1.600 in which there are NO power gains from 'bridging' this amp.
no one called you a "Know it all"... or wrong
Last edited by scottbigred; Apr 2, 2008 at 11:31 PM.
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Originally Posted by Bartak1
Ohh man, did you miss the memo????? They just changed it a few days ago....big red print "THERE SHALL BE NO MORE BRIDGING OF MONO AMPS". Big dissapointment for me I tell ya
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From: Aurora Texas
Hey fellas, thanks for all the posts....kind of wish I had bought the 1X1000 rather than the 1X600 but the more I listen to it and tune it a bit, I am totally impressed with the sound. The PDX amps are SOOO much cleaner than my Punch Amps I had. No more AM radio noise, and it just sounds more clean and more punchy if that makes sense.
I am happy with the purchase, and I did spend a few hours dropping them down 2 more inches...that was fun.
My fosgate 6X8's door speakers sound pretty darn good for 3 ways.
I was only running 50 to them before now 100.
I am happy with the purchase, and I did spend a few hours dropping them down 2 more inches...that was fun.
My fosgate 6X8's door speakers sound pretty darn good for 3 ways.
I was only running 50 to them before now 100.
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From: Slidell, LA
Originally Posted by 051fdrof
Okay... I was referring to the fact that you don't gain any more power by bridging the outputs of the (multi-channel) PDX amps. If you look at the specs for a 4.100 you'll see that the bridged output is just the sum of the two bridged channels. It is more output, but no more than using the two channels independently. An MRP-550 on the other hand, gets you 250 watts by bridging two 90 watt channels. That's why we all bridge our sub boxes.
P.S. 200W is more than 100W.