[Stissy]

Afternoon Saxp,

We currently have an issue with the audio in our car which I’m hoping is a simple resolution. We have quite a heavy audio build (two Pioneer TS2503i co-axial speakers, a Kenwood KFC-W3514 sub and two dual channel amps - one for the sub and one for the speakers, both with their own wiring). Once we get to a certain volume on the headunit (around 15% maximum) the two Pioneer speakers die. Occasionally, when there’s not much bass, they come back to life again and work perfectly, but as soon as the bass comes back the speakers die again. We even managed to play a song which varies in bass and you can hear the speakers coming back on every third beat, before dying again when the bass comes in.

My initial thoughts were that the battery wasn’t powerful enough, so I stuck that on charge last night and will try again this evening. The car is currently off the road and the engine isn’t running, it wouldn’t take much to get the car running again, but as it stands we’re relying on the battery alone, so 12v or so.

Another thing worth mentioning is that the speakers are 4ohm impedance, 80W nominal / 420W peak, and the amp is rated to 4ohm per channel, 100W x 2 nominal / 300W x2 peak at 14,4V, so I assume there shouldn’t be any problem there as I don’t expect the speakers to get anywhere near 420W during normal use, especially not at 15% volume anyway.

Could the sub be drawing the power over the speakers? Could a power capacitor be used to fill the gaps? Hopefully it’s just because the battery was too low and the amp is expecting 14.4v to perform to that spec, but receiving 12v.

Any advice greatly appreciated. Cheers, Jack.