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alpine mrp m1000 overheating


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rboutin2 
Copper - Posts: 90
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Joined: September 18, 2003
Location: Nebraska, United States
Posted: September 13, 2010 at 6:12 PM / IP Logged  
I recently installed 2 12" 2010 model type r dual 2 ohm subs, in a custom ported downfired box, and an alpine mrp m100 amp. The subs are wired at a 2 ohm load at the amp. I have 4 guage power and ground wire running to it. It will play fine for about an hour, being played a little hard, but withing reason, then, ponce it gets really hot, the bass output will cut in half, and if i keep playing it, it will cut in and out, and the amp will go into protect mode. I had this same amp on 2 12" treos at 2 ohms, and it never once got hot, barely even got warm. Are the type r's demanding too much power out of the amp or what? The subs handle 650 rms each. Any help would be greatly appreciated.
Disturbin' Tha Peace
i am an idiot 
Platinum - Posts: 13,598
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: September 13, 2010 at 7:38 PM / IP Logged  
Have you used an ohm meter to verify that they wired at 2 ohms?
rboutin2 
Copper - Posts: 90
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Location: Nebraska, United States
Posted: September 13, 2010 at 8:19 PM / IP Logged  
Yup. They are registering 2.5 ohms.
Disturbin' Tha Peace
still_walkin 
Silver - Posts: 644
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Joined: April 18, 2007
Location: California, United States
Posted: September 19, 2010 at 4:56 AM / IP Logged  
what is your gain set at
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
rboutin2 
Copper - Posts: 90
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Joined: September 18, 2003
Location: Nebraska, United States
Posted: September 20, 2010 at 12:48 AM / IP Logged  

right at the "norm" mark on the dial. bass boost is about 1/4th of the way up. I dont understand why it is happening tho cuz i had two of the type r's (model before newest) and an mrd m1005 alpine amp. That amp never even got warm. arealpine's new amps really not as good as their previous models? Also, how would a hifonics amp run with my r's?

Disturbin' Tha Peace
still_walkin 
Silver - Posts: 644
Silver spacespace
Joined: April 18, 2007
Location: California, United States
Posted: September 20, 2010 at 1:11 AM / IP Logged  
I have the same subs as you however. their Are Two different models 1222d 1242d .maybe its not wired correctly. You could run them mono on the high fonics amp. But I put my money on the wiring
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
rboutin2 
Copper - Posts: 90
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: September 18, 2003
Location: Nebraska, United States
Posted: September 20, 2010 at 7:13 AM / IP Logged  
they are wired correctly. I have the 1222d. I have two of them. they are wired to 2 ohms. They actually read 2.5 ohms on a DMM.
Disturbin' Tha Peace
skinnman33 
Member - Posts: 3
Member spacespace
Joined: November 20, 2008
Location: Florida, United States
Posted: September 20, 2010 at 11:21 AM / IP Logged  
Are both subs wired at 2ohms? If they are and your running them both parallel then the amp is running in 1 ohm. Just a thought not much was specified on your setup. A guy had the same problem and he was running it at 1 ohm on a 2 ohm stable amp. Hope this helps.
I repair amps for a living, cheapest repairs in the USA and honest. so if you know of anyone that needs repairs done, spread the word please.
skinnman
skinnman33 
Member - Posts: 3
Member spacespace
Joined: November 20, 2008
Location: Florida, United States
Posted: September 20, 2010 at 11:36 AM / IP Logged  
Please forgive me I seen you said in your first post that it is 2 ohms at the amp. One of your subs may be going bad maybe. Each voice coile is rated at 250 watts RMS @ 2 ohm giving you 500 watts RMS a sub when both coils are wired in parallel. So yours must be wired in series to bring the subs up to 4 ohms then wired parallel at the amp. Try testing each sub by itself but wire it to 2 ohms and see if the amp gets hot. I have done this myself and found a customers sub was going bad. I don't think it's anything with the amp or it would go into protect but these amps cut half the power when they get to hot so it's hard to tell. Thats why I want you to try each sub by itself.
skinnman
rboutin2 
Copper - Posts: 90
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: September 18, 2003
Location: Nebraska, United States
Posted: September 21, 2010 at 8:36 AM / IP Logged  
so hook only one sub up to the amp, running at 2 ohms,  and see if the amp still gets hot? Whats the likelyhood of having a bad sub? The two subs are brand new from a authorized dealer. The amp i got used, the guy said he only had it for a year.
Disturbin' Tha Peace
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