Crunch PZI-1500.1- is it really 1 ohm stable?

[ElementalXB 10+ year member]

The testing that I have done always produce between 860 and 930 watts depending on impedance rise and voltage drop. Very stout and durable amp, they can be bought right now for 112.00 shipped at vminnovations.com. The amp is better ran at 1 ohm, but will take 1/2 ohm load with no real gain in power.

 

[SicAudio 5,000+ posts]

1 x 375 @ 4-Ohms, 1 x 750 @ 2-Ohms, 1 x 1500 @ 1-Ohm Maxx

divide by 2 for rms.

dont matter if it has 4 or 5 fuses the point is it will do more than rated rms easily.

a little class A/B math for you:

4x30 amp = 120 amp x 12.6 volts = 1512 watts at 100% eff so multiply by .70 for 70% which is average for even crappy AB amps and you get 1058 watts.

this is just a general guideline that is very commonly used by many pros as well for a guesstimate.

that amp will more than make 500 rms easily at 1 ohm.

 

[Mass Car Audio 10+ year member]

1 x 375 @ 4-Ohms, 1 x 750 @ 2-Ohms, 1 x 1500 @ 1-Ohm Maxxdivide by 2 for rms.

dont matter if it has 4 or 5 fuses the point is it will do more than rated rms easily.

a little class A/B math for you:

4x30 amp = 120 amp x 12.6 volts = 1512 watts at 100% eff so multiply by .70 for 70% which is average for even crappy AB amps and you get 1058 watts.

this is just a general guideline that is very commonly used by many pros as well for a guesstimate.

that amp will more than make 500 rms easily at 1 ohm.

70% efficient for a class a/b //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif man you must be dreaming.

120a x 50% x 14.4v = 864 watts

I have never seen a class a/b that is 70% efficient and I work on amps for a hobby. Class a/b amps are only around 50% at a 4 ohm load. Now if we were talking about a class d then you could use the 70% that you claimed.

 

[sportyaccordy 10+ year member]

70% efficient for a class a/b //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif man you must be dreaming.
120a x 50% x 14.4v = 864 watts

I have never seen a class a/b that is 70% efficient and I work on amps for a hobby. Class a/b amps are only around 50% at a 4 ohm load. Now if we were talking about a class d then you could use the 70% that you claimed.

Does efficiency change with the load impedance?

 

[profundus-sanus 10+ year member]

Does efficiency change with the load impedance?

yes, as you drop the impedance effeciency drops with it, due to the increase in current(heat) being put out by the amp.. the ammount the efficiency drops really depends on the amplifiers design.

 

[ElementalXB 10+ year member]

I believe Mike from maxxsonics mentioned some where that these were 68% efficient.