<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote"> I can't remember whether or not the setting is left at a HighPass input level setting, but i'm pretty sure it is. </TD></TR></TABLE>

i didn't remember seeing what type of radio you have feeding signal to this amp in this thread at all. if you could give us a make and model of the deck it might help as well. do you have an aftermarket deck or a stock one with a LOC? you make mention of having it set to a "high-pass input". if that's the case then you shouldn't be using RCAs...you should be using wiring tagged off of the front or rear speakers and fed directly to the amp for it's input signal. if you're using a LOC (line output converter), to change the speaker wiring into RCAs then you should be changing that setting over to low level input setting.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote">nm, its set at Lp. is there anything i should adjust for the crossover frequency? It's set at 50. I will adjust the gain and see what happens. Would you recommend a 60 fuse instead of a 40? </TD></TR></TABLE>

good thing that the x-over is set to LP...but if there is any way to adjust the o-xer point to a higher number it would be better. if i remember on those amps the x-over is either on or off and you can't adjust the frequency...which stinks. if you have one of those bass ***** that goes for the rockford amps you will be able to control boost at that set frequency to get a little more punch from the subs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote">

nm, its set at Lp. is there anything i should adjust for the crossover frequency? It's set at 50. I will adjust the gain and see what happens. Would you recommend a 60 fuse instead of a 40? </TD></TR></TABLE> Your amp does not have a fuse so it must be fused externally, recommended fuse for the 400sp is 40A, do not install a bigger fuse, normally the amp would have the 40A fuse in it, and the fuse that is installed on the power lead at the batt. is to protect the power cable not the amp, and fuse size is determined by the current capacity of the cable, in this case, because the amp uses an off board fuse, that fuse is installed on the power lead at the batt. regardless of gauge of cable, if it was 4ga, 2ga or even 00ga cable you would still use a 40A fuse.

Turn the x-over point up to 100Hz, [to start] and turn down from there till you get the sound you want, set your gain controls at 75%-80% to start and adjust from there, do not turn gains higher then 90%, although you may be tempted to do so. 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JZ98ctr &raquo;</TD></TR><TR><TD CLASS="quote"> i didn't remember seeing what type of radio you have feeding signal to this amp in this thread at all. if you could give us a make and model of the deck it might help as well. do you have an aftermarket deck or a stock one with a LOC? you make mention of having it set to a "high-pass input". if that's the case then you shouldn't be using RCAs...you should be using wiring tagged off of the front or rear speakers and fed directly to the amp for it's input signal. if you're using a LOC (line output converter), to change the speaker wiring into RCAs then you should be changing that setting over to low level input setting. </TD></TR></TABLE>

it's the oem deck with a hi lo converter. I think there is a input wire that runs from the deck into the amp, it's a very thin single wire.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote"> Your amp does not have a fuse so it must be fused externally, recommended fuse for the 400sp is 40A, do not install a bigger fuse,

Turn the x-over point up to 100Hz, [to start] and turn down from there till you get the sound you want, set your gain controls at 75%-80% to start and adjust from there, do not turn gains higher then 90%, although you may be tempted to do so. 94 </TD></TR></TABLE>

will stick with the external 40a fuse, and will try the test of both x over point and gains. i'll let you guys know how it goes, thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote">it's the oem deck with a hi lo converter. I think there is a input wire that runs from the deck into the amp, it's a very thin single wire.</TD></TR></TABLE>
make sure the amp is set to low level input. oh, and that single wire, that's probably a remote turn on wire.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">"Should i upgrade to a 60amp fuse", the OP said he had a 40A fuse and was asking if installing a 60A fuse would solve his problem, the point I was making was as long as the amp had it's own fuse installing a 100A fuse, [max fuse size recommended by 12V.com for 8ga cable] would not make any diff. to his problem. 94 </TD></TR></TABLE>

I would not install a 100 amp fuse on a 8 guage 16 foot wire. Yes 8 guage is capable of supplying 100 amp but I would only do that at 2-3 feet. Beyond that I would worry about melting the jacket and causing a fire.

The charts on that site aren't the best. They have the max current carrying capacity but then no length to go with that. The charts should list max current at max distance. The two are inversly related. If one goes up the other must go down.
They do it in terms of power because thats what everyone understands. But really they are calculating current p=V*I so P/V=I.

I would go with a 60 amp fuse on that wire. If you need more current step up to the next guage of wire.

The OP needs to add some fans Fosgates have always run hot.

 

*UPDATE*

to finish, I brought it to another shop in the area, got a diagnostic and figured out that the voltage on the hi lo converter was way too high, causing the amp to overheat. After that, the amp seemed to run fine at the shop but shut off again soon after I began driving it. I guess the amp just quit out after all that overheating from the past. Bought a new Planet Audio 400wx2 amp at the same shop, came out to a decent price i guess. Frustration just led to an impulse buy. Well, the setup runs pretty decent now, however I haven't been able to find any reviews of this amp at all online after searching. Thanks fcm, jzctr, nsxtreme, wrx killer and all others for all of your insight and help!