punch1001bd and 4 mtx thunder8000 12s
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=50785
Printed Date: May 11, 2025 at 4:26 AM
Topic: punch1001bd and 4 mtx thunder8000 12s
Posted By: a6audi
Subject: punch1001bd and 4 mtx thunder8000 12s
Date Posted: February 24, 2005 at 5:58 PM
i have a punch 1001bd mono amp and 4 mtx thunder8000 12s the connection is as follows: on each sub both positives are hooked up together and both negatives are together and they go to the negative output of the amp, by the way on the box it says that the subs are dual 4ohm... i really dont know much about systems... and i was told you guys know alot.... the subs hit hard but as i turn it up the amp cuts off,like it goes in to protection or sum...or sumtimes it blows the fuse thats by the battery...i have a capacitor and all the wiring is 4 gauge.. and the spaker wire is 8 gauge..... the gain on the amp is half way.... how should i hook up the subs so that they hit hard and wont shut off or blow my fuse....please guys help[ me out
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<---audi a6 quattro
Replies:
Posted By: customsuburb
Date Posted: February 24, 2005 at 6:16 PM
It sounds like you have the gain set wrong...its not a volume control. Half way up can easily be pushing your amp past its limits. To set gain with a digital multi meter you will need a test tone disc with any test tone between 40 and 50 hz recorded at 0db. Then follow DYohn's directions on setting amp gain with a digital multi meter: "Voltage = square root (Watts times Ohms). 400 X 4 = 1600, square root of this = 40 So if your load is 4 ohms, your amplifier has to produce 40 volts to be at 400 watts. Set amp gain at minimum. Wear hearing protection. Start the vehicle. Play an appropriate test tone from your HU (is this a subwoofer? Try something between 50-70Hz.) Turn up volume on HU until you can detect the tone has changed or gone "shrill" or "flat." This is the distortion point on your HU and is the MAX volume you cannot exceed without causing possible speaker damage. Back off the volume until the tone is clear again. Memorize this volume setting. Turn off the HU and the vehicle. Disconnect your subwoofer from the amp. Connect your DMM set to AC Volts with the positive meter input connected to the + speaker output and negative to -. Start the car and turn the HU back on. Play the same tone and turn the volume up to your earlier memorized setting. Slowly turn up the gain on your amplifier until your meter indicates 40 volts AC. This is the max gain setting to match the HU output. Mark it with a sharpie. Leave it there and never touch it again. Disconenct your meter. Turn off the HU and the vehicle, reconnect your subwoofer to the amp. Fire it up and see how it sounds on your music. If the bass is overwhelming the mains, you can back the gain setting DOWN to balance the system, but NEVER turn it up past the point you set with your meter." https://www.the12volt.com/installbay/forum_posts.asp?tid=50672&PN=2
Posted By: furflier
Date Posted: February 24, 2005 at 6:17 PM
a6audi wrote:
the gain on the amp is half way....
You need to set your gain properly. It is not a volume control. What kind of hu are you using? We need to know this in order to help you out. -------------
Posted By: a6audi
Date Posted: February 24, 2005 at 6:31 PM
it is an alpine 9831 you guys dont think i wired the subs wrong....do i have the subs wired at 1 ohm or 2? could the amp push all 4 subs and if i have them wired wrong could yall tell ne how
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<---audi a6 quattro
Posted By: customsuburb
Date Posted: February 24, 2005 at 6:40 PM
You can wire your subs for 8 or 2 ohms. I would wire them for 2 ohms to get the most out of your amp: 
Posted By: a6audi
Date Posted: February 24, 2005 at 6:43 PM
is the amp enough for the subs i think they are 75-400 rms recommended and the amp it says 2ohm load =1000x1
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<---audi a6 quattro
Posted By: a6audi
Date Posted: February 24, 2005 at 6:45 PM
is the amp enough for the subs i think they are 75-400 rms recommended and the amp it says 2ohm load =1000x1 also whats the reason for the amp turning off and blowing fuses.... it diesnt blow fuses anymore i added a circuit breaker.. but why does it turn off
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<---audi a6 quattro
Posted By: a6audi
Date Posted: February 24, 2005 at 6:46 PM
is the amp enough for the subs i think they are 75-400 rms recommended and the amp it says 2ohm load =1000x1 also whats the reason for the amp cutting off and blowing fuses.... it diesnt blow fuses anymore i added a circuit breaker.. but why does it cut off... after it cuts off i have to turn the stereo off and then back on in order for the subs to play again
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<---audi a6 quattro
Posted By: furflier
Date Posted: February 24, 2005 at 6:57 PM
You are overloading your amp.You need to set your gain as stated above. Also wire your subs as stated above.
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Posted By: customsuburb
Date Posted: February 24, 2005 at 7:07 PM
From what I have heard those subs are power hungry. If someone was expecting more out of them with 250 watts going to each and cranked the gain on the amp (or set it to half way) what would happen is probobly what you are experiencing. The amp is being pushed to hard and is cutting out. You could also be experiencing a bad ground. Those RF amps need a good ground to work well. Are your subs in a sealed box? If you would like to keep the same amp but get more volume out of them then I would switch to a ported instead.
Posted By: ty
Date Posted: February 25, 2005 at 4:55 PM
you wired your subs parallel, which 4 subs parallel with 4 ohm dvc's =0.5ohms. So Your amp is 1000 watts at 2 ohms, and you are trying to push 0.5 ohms=not going to happen, why your amp is shutting off. You need to wire your subs like customsuburb said in parallel so you will be running 2 ohms at the amp. Also fix your gains like he said too and you should be good to go. Also check this website out www.bcae1.com this should be your guide to car audio it is great.
Posted By: forbidden
Date Posted: February 25, 2005 at 8:25 PM
series / parallel to be precise ty, wire the subs as customsuburbs diagram showed. These amplifiers need a really good ground, especially once the volume is turned up and the amp is drawing current. Pay very close attention to the ground wire and make sure that you read the stickies at the top of the car audio forum on grounding. This will help out considerably for your issues.
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Top Secret, I can tell you but then my wife will kill me.
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