Hi i just got 2 new infinity 860w reference 8'' subs 250 rms each and pushing it with sony 600watt amp pushing it but very low sound and no bass why the othier speakers i have in 10'' hit the bass fine but the infinitys are not i have 6x9 hitting harder

Is the sub dual voice coil?

I don't recommend it. It may work good during low volume, but from experience, you will only turn it up so high before it trips the protect light on the amp since it's drawing too much current due to extra speaker(sub), then you have to turn off the radio and turn it back on to get it working again, it gets annoying. I recommend saving up for a mono amp, it will keep your system sounding clean and clear. the setup you specified will work, but it's not recommended. Your amp may run hot as well.

Hello hembreegerry,

If you like a lot of bass, you definitely need to consider another amp. The SP2X-300 is only rated at 170 watts RMS into 4 ohms mono. That would barely be enough to power one small sub. You do not specify what brand and model your subs are, their impedance, or their power handling capacity. But for any subs, your best power solution is to add together the individual RMS power handling capacity and select a monoblock amp that provides close to the maximum at the impedance they will be wired to present. For example, if your subs are 4 ohms and have a maximum RMS of 250 watts, you would want an amp that outputs abour 500 watts into 2 ohms (2 4 ohm subs wired in parallel = 2 ohm load). An ideal amp in that example would be the Alpine MRP-M500 which outputs 500 watts RMS into 2 ohms.

Hope this helps.

it has a detector that kicks in it will usually shut off your amp and it keeps you from blowing your amp the speaker may have to much power and amp may not push it it will start to protect itself

Hello monkey_flea, Your subs will share the amp output. And if you are not careful, you'll end up blowing them. The amp puts out 1300 watts RMS at 2ohms, the subs have an RMS power range of from 75-350 watts, and you'll be driving them with 650 watts each. A better power match would be to series the subs to present an 8ohm final load. This will reduce the output power to a level the subs can handle. Or you could buy 2 more 12.1's and connect them series-parallel for a 4ohm load and each sub would still be getting 325 watts RMS, just about the maximum they are rated to handle. Hope this helps.

if its hot its drawing to much current sound as if you have something improperly hooked up..if i could see your wiring i could help u out better steve

IF THE RMS IS 800 THEN THAT IS THE MINIMUM YOU SHOULD RUN TO THEM. IF THE MAX IS OVER 1000 WATT, YOU SHOULD BRIDGE ONE SPEAKER TO EACH CHANNEL. YOU WILL PUSH THE MOST POWER TO THEM THAT WAY. MORE POWER = MORE BASS

2 subs and 1 amp

Hi jimmyjames,

 

How do you have the wires hooked from the sony reciever to the inputs on the mtx? 

 Sounds like your Remote wire is way too big. it should be 14 guage.  It only sends a low voltage low amp signal.

 

Another thing that could be messing up the sounds is the routing of the wires.  you should have the power supply wires separate from the Audiop signal wiring.  Power should run down the Driver side and Audio down the passenger side.

 

When you answer I may be able to tell you more.

 

The amp's not actually a very good match for the sub, since the sub can be wired for 2 ohms or 8 ohms, and the amplifier is most efficient at 4 ohms in bridged mode. My advice would be to wire the amp in bridged mode, and wire the sub for an 8 ohm load. To do this, the amp's (+) wire should go to the (+) terminal on one of the sub's voice coils. Then run a wire from the (-) terminal on the OTHER voice coil to the (-) terminal on the amp. The remaining (+) and (-) terminals (on opposite voice coils) should be connected to each other with a wire. Your original wiring setup had the amplifier connected to only one voice coil, while the other voice coil was shorted.