Hello together! I bought a bridge AQ 75.4 at ebay this weekend, picked up right away and of course also built in. My 13 Focal front system runs on Hi-Pass and a (for testing borrowed) Mivoc 25cm cheap bass reflex woofer snapped on Lo-Pass. Since I have not yet a clever headunit, I first connected an MP3 player and later the original radio via Hi-Lo adapter. Front system ran really neatly for my taste but it is clear to me that it still b it will sound better when I’ve done a clever HU. I borrowed the Mivoc Sub from a buddy. He was still running a cheap Sony power amplifier about 1 year ago and he pushed it so hard that you really got in pain! In terms of pressure his new JL 12w0 can cut off a disc from the Mivoc but the sound and the draught of the Mivoc are really bad. Well, I put it in the back of the smart and he has already done quite well. But he didn’t do as well as he did in the Corsa back then. Power amplifier as I said, so 250 watts. He ran the whole morning like this and when I started the system again at noon was almost nothing more to hear from him. He ran very irregularly and also scratched. After that I connected the Woofer unbroken to a Lo-Pass channel (75 watts) and then he played at once much better !! (and in between I connected it at home to my amp also (filtered) and there he has a huge hub made and was much louder than on the bridge… Now I’m really wondering what’s going on… I have no idea what the woofer has for an impedance but could it possibly be decisive for the bridge?? am not so the checker in terms of… Does anyone know what it might be??MfG Marc Edit: – Hi-Pass was turned on 1/3 and Lo-Pass on 2/3 – Cables are not connected to the bridge and sufficiently thick – Switches on the bridge exactly as it should be