Hello, So my first post *g* has already read some Treads about it but örgendwie could not really help me :/ So I have here an impulse CW1212 Woofer and wanted to create for the one at home, listen mostly Techno sometimes also black. Data about the Woofer: diameter 300mm, 1200Watt (max) RMS approx.600W, 4 Ohm Free Air Resonance 20Hz Qm 4.35 / Qe 0.213 / Qt 0.204 …… X-Max 23mm /VAS 4.87 / 90 DB / Equtv. Volume 138 liters. I hope times this is enough data *g* I thought e as a design to a bandpass or also a bass reflex. Unfortunately in my boot of my polo there is no longer enough space but can be used without probs completely because only 1-2 PC ́s still have to fit in for convenient Lan-Parties Áchso as final stage I have an Opus 2 running which 2x 175W @ 4 Ohm or 2x 350W @ 2 Ohm or snapped at 4 Ohm 1x 625W (All RMS values) well now you are asked I hope you have something for me.