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noob 
Copper - Posts: 92
Copper spacespace
Joined: June 13, 2003
Location: United States
Posted: December 03, 2003 at 6:20 PM / IP Logged  

alright heres the deal.......i just got my rockford amp and HE2.....i have the 1500W 501S......now i bridged my amp to the sub and wired my sub up like this

amp cutting out -- posted image.

sorry i dun know what its called.......

so does anyone have any ideas why it would start cuttin out......i had been usin it fine but only for short amounts of time (15-20minutes) for tuning......and today i was usin it for about 45 minutes when i was driving.......all i could think of would be that its overheating.....but its mounted on the back of a box in my trunk with plenty of airspace to cool......so i dunno.....

oh also......everytime it begins to cut out i would turn off my HU for a minute or two, then turn it back, and it would be fine for about another 5 minutes b4 it happened again......

alright sorry its so long......thanks in advance

bberman1 
Gold - Posts: 2,314
Gold spacespace
Joined: March 11, 2002
Location: United States
Posted: December 03, 2003 at 6:27 PM / IP Logged  

 The 501's ratings are below

•  125 watts RMS x 2 at 4 ohms
•  250 watts RMS x 2 at 2 ohms
•  500 watts RMS x 1 at 4 ohms in bridged mode
You are running your sub bridged in parallel for a 1X2 Ohm load. Your amp is cutting out because it cannot support a 2 ohm load bridged, the lowest it will go is 4 ohms bridged. The only way to hook it up is to wire each voice coil to its own channel for 125 watts X 2 @ 4 ohms. I would also suggest you get a Y and split one of your input channels so you have a mono input signal if you wire it 125X2. That amp is not a very good match for your sub; you may want to consider a different amp

forbidden 
Platinum - Posts: 5,352
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: November 01, 2003
Location: Alberta, Canada
Posted: December 03, 2003 at 6:38 PM / IP Logged  

Your amp is going into protection for multiple reasons

(1) the amp is not designed to operate at a 2ohm mono load. You have parallel wired the subs to a 2 ohm mono load.

(2) you may have a really crappy ground.

(3) you have a high resistance on the ground

(4) you have the gain / bass boost on the amp too high.

Now while your amp will probably play all day wired the way it is at lower volume levels, at higher volume levels the amplifier produces excessive heat which sends the amp into thermal protection (don't want to melt the amp right).

Now I don't know who sold you your equipment, but I for one would head right back and get a different amp or a different sub, you were sold good equipment, it just was not matched together correctly. To keep the sub, have a look at the Rockford Power 351M. It is designed and engineered to run continuously at 2ohm mono with a MINIMUM of 350 watts rms, you sub need 250-400 rms, a much better match.

Top Secret, I can tell you but then my wife will kill me.
noob 
Copper - Posts: 92
Copper spacespace
Joined: June 13, 2003
Location: United States
Posted: December 03, 2003 at 6:38 PM / IP Logged  
but if i wired each of my voice coils on seperate channels wouldnt that be dangerous to my sub because each VC is receiving a different load....... so if i just wired the sub the same and put it on one channel......would i be fine then?
bberman1 
Gold - Posts: 2,314
Gold spacespace
Joined: March 11, 2002
Location: United States
Posted: December 03, 2003 at 6:47 PM / IP Logged  

You can wire it to one channel, or you can get a Y and split the input signal which will give you a mono signal to both channels. Either way you hook it up you will get the same power. And as long as you have a mono signal, each voice coil will get the same signal so it will be safe to wire your sub to 2 channels.

noob 
Copper - Posts: 92
Copper spacespace
Joined: June 13, 2003
Location: United States
Posted: December 03, 2003 at 6:54 PM / IP Logged  

so if i leave the sub wiring how it is now, and put it on one channel then i should be alright right?

i mean i could always go get a new amp and reconstruct everything i got but that just means more $$$......and im tryin to get a new car, instead of new car stereo

bberman1 
Gold - Posts: 2,314
Gold spacespace
Joined: March 11, 2002
Location: United States
Posted: December 03, 2003 at 7:15 PM / IP Logged  

You’re correct; the easiest thing to do with the current setup is to bridge your sub to 1 of the 2 channels which will give you 250 watts rms total. However if you plan on using that as your permanent setup I would suggest you either return or sell that amp for a better match.

noob 
Copper - Posts: 92
Copper spacespace
Joined: June 13, 2003
Location: United States
Posted: December 03, 2003 at 7:30 PM / IP Logged  

dammit.......the HE2 is rated 400 W RMS......with that I'd be underpowering my sub.......

man i'm leery on returning my amp, cuz i work for best buy (where i got it)......and i had a Kenwood that blew, then i got my 1500 w....but they gave me the 4 channel instead of the 2......now i have the two....and this happens.....they're gonna get pissed at me......

anyone got any way i could use this amp to power my sub w/o havin to return or purchase anything and w/o damaging anything???

forbidden 
Platinum - Posts: 5,352
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: November 01, 2003
Location: Alberta, Canada
Posted: December 03, 2003 at 7:38 PM / IP Logged  
Not recommended, but I believe bberman gave you some info on how to do it if you want. They might be pissed at you, I am more concerned with the guys selling you this stuff, I would be pissed at them for not knowing what the ____ they are selling. Even though you may work there, in this case you are still a customer who needs to be looked after. What Best Buy store is this btw?
Top Secret, I can tell you but then my wife will kill me.
noob 
Copper - Posts: 92
Copper spacespace
Joined: June 13, 2003
Location: United States
Posted: December 03, 2003 at 7:50 PM / IP Logged  

115 it is in southern cali.......

yea bberman said to run it off one channel but that leaves me with a 250 w load.......which is underpowering......or was there somethin else i overlooked?

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