There worth from 35 to 80$ per speaker ! plus the box. I've got the same ones 2x10 in a box and never had a problem. If I did it was always with the power amp settings. Remember the speaker specs when setting up the amp. otherwise sell them quick on ebay or your local cash converter shop.
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Can't help you on the manual, but basic specs for both drivers are listed on crutchfield.com web site.
Easy way to do it is ; type in KFC-W2505 and the KFC-W2509 in your search engine and click on the Crutchfield web site. This will give the overall cubic dimensions of the cabinet, plus other info. Hope this helps...
Possible problems: 1) No output from the head unit. Try a different set of preamp outs. 2) No input to the amp. Check the RCA's and make sure that they are good and coming from a functioning preamp or subwoofer output on the head unit. 3) Input gain turned off or down too low. 4) Speaker wiring shorted, grounded, or open. Check all wires. 5) Speakers defective. Connect to a known good output to test. 6) The amp itself could be defective and still show a power-on indication.
You need to know the speaker travel distance (excursion) and a few other numbers from the maker of your speaker, then you can plug those numbers into a box calculator. Just the wattage isn't enough to know.
Also, you will get different numbers for sealed, ported, and bandpass boxes, so you need to know which type you want ahead of time.
You may have a high resistance in your positive or negative power supply. with your amp you need to use at least a 2 gauge power cable. Is your fuse blowing? if so then a short circuit to ground may be causing that. Good luck