I ordered a 500 watt JL Audio mono block amp from Sonic. I hooked the amp up in my Tesla to a single 10" sub I had. The amp provided very little power to the sub. I contacted Sonic to return the amp, which was subsequently denied. I then asked for a simple exchange, denied again. Their hassle free warranty is ridiculous. As another noted below, go with Crutch Field if making an online purchase, you will be happy with not just the product but the service as well.