| Author |
Thread: PDX-2.150 and PDX-1.600 |
    
New member Username: Dunnkm2
Post Number: 3
Registered: Apr-08
|
| Posted on Tuesday, April 29, 2008 - 10:35 pm: |
|
Any estimate on the current draw with the 2.150 at 4 ohms and the 1.600 at 2 ohms. I know they are efficient amplifiers but I was just curious to see an estimate. |
|
|
|
Gold Member Username: Juliob
Santo Domingo
Dominican Re...
Post Number: 5309
Registered: Dec-05
|
| Posted on Wednesday, April 30, 2008 - 03:48 pm: |
|
what's the size of your alternator? i dare to say your car will hold those amps |
New member Username: Dunnkm2
Post Number: 4
Registered: Apr-08
|
| Posted on Wednesday, April 30, 2008 - 03:56 pm: |
|
It's an Infiniti I35, and I believe the alternator is 110 amp. I don't know the amps at idle though. I was under the impression that anything under 1,000 watts generally wouldn't need an alternator upgrade. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1557
Registered: Mar-04
|
| Posted on Wednesday, April 30, 2008 - 04:27 pm: |
|
I'll take a stab at it...
~900w at ~75% eff at ~13.5v = 88.88A
That would be appx. current demand for full volume test tones.
Assuming you listen to music you can knock that down to about 30A.
Assuming again, that you don't listen at full volume ALL the time you can knock that down to 15-25A, or less.
No problem at all for anything other than the weakest of electrical systems. At least it shouldn't be. |
New member Username: Dunnkm2
Post Number: 5
Registered: Apr-08
|
| Posted on Wednesday, April 30, 2008 - 05:01 pm: |
|
Thanks for the reply. Is there any difference in current draw from 4 ohms to 2 ohms (since the amps are producing the same power at both impedances)? I'm just trying to avoid buying a HO alternator (I had to for my previous system/car). |
Silver Member Username: Hurricanebr1an
Western Burbs of Chicago,
IL
Usa
Post Number: 468
Registered: Sep-07
|
| Posted on Wednesday, April 30, 2008 - 05:08 pm: |
|
It would be 900 @ 2ohm max (600 @ 2ohms + 300 @ 2ohms). If you are worried, find a less powerful 2 channel, but I wouldnt be either. |
Gold Member Username: •cam•
BC
Canada
Post Number: 2481
Registered: Nov-06
|
| Posted on Wednesday, April 30, 2008 - 11:52 pm: |
|
I had close to 1200W on my 55A alternator without much trouble. You'll be fine. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1559
Registered: Mar-04
|
| Posted on Thursday, May 01, 2008 - 07:32 am: |
|
"Is there any difference in current draw from 4 ohms to 2 ohms (since the amps are producing the same power at both impedances)"
Probably a little bit. That type of amp is usually slightly less efficient at the lower impedance, but not by much. Not enough that you'd need an HO alt.
FWIW - my old car had a 110A alt. I ran 360w class a/b, and 700 class D. It ran perfectly fine. |
Gold Member Username: Juliob
Santo Domingo
Dominican Re...
Post Number: 5317
Registered: Dec-05
|
| Posted on Thursday, May 01, 2008 - 02:38 pm: |
|
i have 1k rms on 80A |
New member Username: Dunnkm2
Post Number: 6
Registered: Apr-08
|
| Posted on Friday, May 02, 2008 - 07:52 pm: |
|
Thanks for the input guys. |
