The sub and amp is one of those active enclosures where the amp is built in and 2 12" inch subwoofers, Vibe brand.

Were purchased brand new, and ran in for a week or two at low/medium volume as the manual says to do so to avoid damaging it.

Turned the gain 3/4 of the way round, the frequency is at around halfway, the headunit is set to 0 on bass, 0 on mid, +3 on treble, the LOUD is on, the amp output on the headunit is turned right up, but for some reason the bass isnt loud through the sub as it should be? You can hear it and you know its on, but it doesnt reallly boom, or echo, it more or less bangs? Turning up the bass on the headunit you end up with distorting loud speakers and a little louder on the sub, tried fading it too, im at a loss as what to do, i dont have the headunit manual but looked on kenwoods site manual online and doesnt seem to throw up much joy either.

Tried swapping phonos around to no joy, adjusting the amp on the sub, no joy, played with the headunit, no joy, the higher you set the bass, or the amp, the more it bangs instead of thumps but at lower volume it thumps/punches as normal, ??

Really cannot figure out what is going on, the sub/amp is fine as far as i know as its powering up fine and all the settings on the amp are working, just doesnt seem to as powerful as it should be.

The headunit is a Kenwood flip front KDC-M7024 model. its a fly/vibe 12" twin active inclosure, 800watt RMS

Any ideas?

 

Try pushing the subs in and out and listen out for any scraping sounds..

Could be that a sub has fried a coil

Could also be a fault with the amp

I would check the subs first and then possibly swap the sub RCA on the headunit with another output (rear or front) and see how you get on

 

Thanks mate.

Reading the manual online, it doesnt mention the word subwoofer anywhere, so does this mean it may not be compatible to use with sub/amps?

Ive just learnt its got 2 preouts, the first pair are front pre outs, the second are rear, non fading preouts? Im going to make sure its connected to the non fading rear ones, as im sure it is and make sure the headunit is set to that preout but thats my only hope, the subs are fine, i had them checked by a guy at work that works in audio installations and it baffled him too, everything is fine, maybe its just the headunit?

It is this headunit -

http://www.comparestoreprices.co.uk/...-kdc-m7024.asp

Manual

http://manuals.kenwood.novenaweb.inf.../KDC-M7024.pdf

 

Ive sussed it! Just went out and had a play after swapping the RCA leads onto the non fading ones, didnt work at first, then had to set it to the non fading ones in standby mode on the headunit, then had to put it on CD/Tuner and turn the preout up, awkard as hell headunit, prefer Alpine myself! Absolutely thumps! Don't think the neighbours were too impressed though ! Thankks