Help with Phoenix Gold MS2125 and M44
 

Hi to all,

I'm running from a Clarion HU (4V pre out) a PG MS2125 (= 2 channel
amp) and a PG M44 (= 4 channel amp), no EQ or line drivers in the
signal path.

On the M44 I am only using 2 of the 4 channels to power my fronts (75
Wrms Infinity Perfect 6.1), each channel driven at 4 ohms (so 2
channels are unused).

The MS-2125 I use to power a single 12 inch sub in a sealed enclosure,
Cerwin Vega 12.4 Vega (rated at 400 Wrms). The MS2125 is bridged with 4

ohms. I use the X-over in the M44 to filter the MS2125 for the use of
the subwoofer.

According to the spec's of the manufacturer (taken out of the user
manual):
M44, running at 4ohms should pull about 23 amps, I'm using only 2
channels so 23/2=11,5 amps (stereo into 4 ohms should give 2 x 55 watts

RMS @ 13,8 Volts)
MS2125, running at 4 ohms bridged should pull about 60 amps (bridged
into 4 ohms should give 1 x 510 watts RMS @ 13.8 Volts)

Total of 71,5 amps at 13,8 volts

I have a 40 amp fuse under the hood, but turning the up volume doesn't
even make the fuse blow. The headlights dim only by a very small amount

when turned up to 75%-85% of the max HU volume. The red clipping light
of the MS2125 lights up occasionally with heavy bass at high volumes.
The MS2125 doesn't get very hot after playing a full hour.

I get the feeling I am doing something wrong and depriving my speakers
of power. As I am in no way pulling 70 amps (the 40 amp fuse isn't
blowing), the voltage must be dropping significatly low at the amps or
is this a wrong conclusion?

Would it be wise to replace my power cable running from the front to
the back + the ground wire? I am using a 25 mm2 (AWG 4, not sure) at
them moment. It's 4,5 meters long now. Could I add an extra wire to the

25mm2 wire or is it better to replace (= extra costs)?

Any suggestions?

Thanks,
Drew aka PG Dude

PS I recenty replaced my Phoenix Gold MAC-200 for the MS-2125 and I
have no noticeable extra SPL using the MS2125, is this normal?

PS2: this question has also been posted in rec.audio.car