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**Disclaimer: I'm not an expert and just did this with what I've read on multiple forums** Hopefully, it makes sense to everyone. So, I had some spare time to kill and decided to experiment with the ICON. I have multiple amps sitting around so I thought I'd try 2 different 1999 model US Amps (USA-100 and Xterminator 100X) to see how the 3.1 ohm load reacted with the 1 ohm and 2 ohm stable amps. The USA-100 is 1 ohm stable and the Xterminator 100X is 2 ohm stable. Both plexiglass covers were removed (I like them this way to increase airflow potential). My Audio Authority 978 (60A) power supply was reading 13.8V and I set the gains on both amps using a 40Hz test tone on my iPod and my TPI Scope Plus 440 Oscilloscope. Both gains were set until I saw clipping and then backed off to the nearest whole number. I played the same 3 songs on the ICON freeair: Bass Mekanik-808 Tune Up, Flosstradamus- Ith, and Basstronics- Bass, I Love You). Each testing lasted about 12 mins total. Known factors: USA-100: 19V per channel/ 38.5V bridged Xterminator 100X: 24V per channel/ 48.8V bridged ICON (wired in series): 3.1 ohms Using Ohm's Law, I found the amps: USA-100: 19V / 3.1 Ohms = 6.13A, 38.5V / 3.1 = 12.42A Xterminator 100X: 24V / 3.1 Ohms = 7.74A, 48.8V / 3.1 = 15.74A Now that I had the volts and amps, I could see how much power was being output: USA-100: 19V x 6.13A = 116.5W/channel, 38.5V x 12.42A = 478W bridged Xterminator 100X: 24V x 7.74A = 186W/channel, 48.8V x 15.74A = 768W bridged The USA-100 was very warm. I tried to measure the ohm load when music was playing but it read 8.7 ohms at the amp and sub. I must have done something wrong. The bass was there but it didn't seem loud enough. The Xterminator 100X was hot enough to fry an egg! Again, I tried to measure the ohm load and it read .585 ohm so I wasn't doing something right. The ICON performed better on this amp and the bass was noticeably louder. Based off this experiment, I think the PPI PC1400 won't be as loud as the US Amps PT-1100. I just hope the ICON doesn't fry the PT-1100's Tripath chip at 4 ohm bridged. Let me know if any of my calculations are off or I screwed up anything.

2 x Blown ZCON 12s $229/shipped each.Please PM me, Mark LaFountain with any questions, I accept PayPal or Money orders.