Bridged Amp to Two Subs, only one channel working - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-25-2010
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Bridged Amp to Two Subs, only one channel working

So heres the deal
i've got 2 alpine type-S 4 ohm subs bridged to a crunch 880.4
channels 3 and 4 (wired to the driver side sub) tune fine and hit great
channel 1 and 2 ( passenger side) aren't letting me tune, as soon as i touch the level the amp goes into protect mode...i've read through the manual, and seached google to no avail

anyone have any idea whats going on?
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Old 02-25-2010
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have all of your rca inputs hooked up?
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Old 02-25-2010
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yeah ive got a rockford fosgate splitter and a generic one
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Old 02-25-2010
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Okay and your having problems when you try to adjust the Gain Level on chan 1-2 right?

have you flipped the 2ch-4cha switch to 2-chan?

also make sure you have the crossover settings to LP for both sides.
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Old 02-28-2010
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thank you, checked that
good to know about the crossovers but it doesn't seem to make a difference

took the sub out of the box yesterday and found the drill bit i lost during installation stuck to the sub's magnet

i think that explains protect mode coming on every time i gave that sub power, but im still not getting any sound out of it

VU readout shows power going to the sub so im thinking i screwed something up with the speaker wires
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Old 02-28-2010
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maybe you have a shorted voice coil or pinched wires..
hook your non-working sub to the working side of the amp that will tell if its at least working.
if you happen to have a multimeter the resistance of the sub should be about 3.5 - 4.5 Ohms

The crossover settings are important. you do not want to send high frequencies to the sub.
Not only is it wasting the power of the amp on high frequency you can damage a sub by doing that.
HP=High Pass LP=Low Pass Off=Full Pass. Low Pass allows only low frequencies to pass to the sub.

You think you screwed up the wires, how? can you explain how you have them hooked up?
Im not sure how much knowledge have about car audio so forgive me if im being too simple.
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Old 03-01-2010
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no its cool i appreciate the help
took the sub out of the box again today, found that the negative wire was in too far to the clip, so it was grabbing the rubber if you know what i mean
but still going into protect mode even though everything should be good now
ill grab a multimeter from work and see what if the resistance works out
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