I dont know waths the amp for the two fuse on my Legacy II LA890

what happened when you tried the correct size fuse after the larger one?

Check all your fuses and make sure your ground wire is properly grounded you can put it right on the neg side of your battery to test.

25 to 30 amp fuses will work great, anything lower could possibly blow a fuse when a good bass note hits even if there is nothing wrong with the amp. Hope this helps.

usualy a 30 amp fuse because they can hold alot more power than a 20

i would not worry about that really you dont need it i know install more than five hundred of them

do u have an crossover

Have you checked the fuses on the amp?

Have you confirmed that you have both B+ and remote voltage at the amp?'

When measuring the voltage, place the black meter probe on the ground terminal of the amp.

If you are going to try to repair this yourself and can't find a schematic diagram, read the following page. It should help you through basic troubleshooting.

Amplifier Repair Primer

If you have questions, let me know.

1) legacy products are highly overrated and i have never seen one put out the power it claims
2) if you are running the amp bridged, you need to match the impedance of the speakers to the amps highest output impedance, otherwise your system will not sound all that great...

what size fuse or fuses does your amp use? what size wire did you install with (power and ground)? did you connect direct to battery or did you connect to a fuse block or similar? did you use a stiffening capacitor? does it sound like it is clipping when you turn it up or is it just distorted? what kind of box are you using for the speakers (ported, vented, sealed, bandpass)?

if you give me the model number of your speakers and your amplifier i can probably help you more, but with the information you have provided, this is all i can offer..

hope it helps,
trin

Do you actually see a fuse in it? If there is a fuse it should typically say on it what the rating is.