So, hmm myself being an electrical engineer (presently designing some of the new avionics for Boeing's new "787 dreamliner") I hate to do anything normal when it comes to electronics. So I wanted to amplify the line out of my Roland db500 practice amp for MAX LOUDNESS. I am not a speaker expert, nor are my ears. I picked up unloaded cab for 50 bucks. A while back I went on ebay and found some cheap car woofers the kids love so much: 2 of these for Pyle pw-1058us 30$ # 10" Blue Color Woofer Cone # Ultra High Performance/High Power # 50 oz. Bumped & Vented Magnet Structure # 2" Kapton Bobbin Voice Coil # 300 Watts RMS/600 Watts Peak Power # SPL 1W/1M: 90dB # Diameter: 10 1/8" # Frequency Response: 25Hz-2.8kHz # Mounting Depth: 3.75" # Impedance: 4 Ohms And 2 of these Polk Audio GNX104 for 25$ # Frequency Response: 18hz-400hz # Peak Power Handling: 400 watts # Continuous Power Handling: 175 watts # Nominal Impedance: 4 ohms # Sensitivity (SPL at 1 watt/1 meter): 93db They had good SPL ratings and tons-opower and I figured they are cheap because they are practically commodities. epecially at closeout deals. I wired the two 8 OHM speakers in parallel for a 600 WRMS bass channel and the two 4's in series for 350 WRMS sub channel (seperate jack) Total watts = 950RMS, 2KW peak. This cab is the loudest/deepest 4x10 I have ever heard. I found that if I just use the two 2.8KHz bass speakers, the subs act as passive radiators and give a beautifull warm sound to the cab. I am pleased with the outcome and let me just say my i am very glad my house sits on 1.5 acres.