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Help ! :(

Posted by KanedaK (A) on August 24, 2016 at 01:56:01

I just bought a car-audio active crossover to use iton my main system. The thing was discounted from 220$ to 36$ on all website I saw it; I figured maybe they were closing the line or the brand or something like that, and for what I wanna do with it, it'd be good enough (I'm just planning to use the low-pass section)

Being car-audio, the thing feeds on 12v; there's a 1A fuse next to the PSU input so i figured (but maybe i'm wrong?) that it feeds on 12v and max consumption would be less than 1A... so I'm using this wall PSU I got with some small DIY DAC, I just desoldered the original terminated cable and soldered a simple generic wire on the pSU board, the V+ going straight in the crossover's V+ input, the V- in the -, and there's a small piece of wire going from V+ to "remote" ("remote" triggers the device ON)

My preamp's main 1 output goes straight to the little amplifier feeding the passive crossovers for the midrange and treble (the lows are filtered passive, and there's a 6 ohms resistor connected where the woofer used to be)

the preamp's main 2 output goes to the active crossover, and the low-pass output of the active crossover feeds the amp for the 15inch drivers.

The active crossover LED indicates it's on, and the clipping leds turn red on each channel when I turn things up too much, yet there's absolutely NO SOUND coming out of the crossover, just hum. I tried all outputs (low pass, band pass, high pass, mono sub), there's no sound coming from any of the crossovers output.

I have no idea if the PSU I "made" is wrong (not enough current? but it's just opamps and resistors in there) or if the crossover has a problem.

I don't really know where to start to try again: borrow a car battery? get a regulated pSU with more output current?

I'm most likely going to buy a CABRE AS45 crossover but it would be nice to make sure this thing is functional, so I can put it on the bay or use it on a cheap project...

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