300/4 not reaching proper voltage for gain

[lil azn 06 10+ year member]

Hi,

Im using a JL Audio 300/4 at 75 for 2 channels at 4 ohms with an Alpine 9855. I recently tried setting the gains for the amp using a 1khz wav but i cant get the amp to reach its supposed 17.3 V. The max it will reach is 11.9 V. The car battery registers 14.4 V to the amp and i know its not a headunit problem because my 500/1 reached its V goal and that before, i had the same problem with a older JVC HU. This leads to the amplifier being the cause, but does anyone know why it wont reach its potential?

Also, the JL manual states that the amplifier is not stable at 2 ohms, yet on their gain setting chart it still shows the amp at 2 ohms. Is it safe and good to run it at 2 ohms (bridging)?

Thanks

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[camry_tuner 10+ year member]

i dont think its 2 ohms stable wen bridged, but will play at 2 ohms when not bridged

 

[helotaxi 5,000+ posts]

As far as the voltage thing goes, make sure that you have the input voltage selector set to LOW and make sure that the x-over is set to HP or OFF.

 

[lil azn 06 10+ year member]

The V is set on low and the xover is set on high.

 

[helotaxi 5,000+ posts]

What is the freq on the x-over set to? Also make sure that the X10 switch isn't engaged.

 

[3onDubs 10+ year member]

It's only stable down to 3 when bridged.....1.5 normally.

 

[tRiGgEr 5,000+ posts]

Use a 100hz tone