Hey bro, when you wire a dual ohm subwoofer such as the SWR-12D4, the amplifier will run at 2 ohm impedance.

The Pioneer GM-D8601 gives 500W RMS x 1 @ 2 ohm (manufacturer rating)
The Alpine MRX-M55 gives 550W RMS x 1 @ 2 ohm (manufacturer rating

The MRX-M55 will fare better to power the SWR-12D4. Thank you.

Hey bro, every single piece of audio equipment that you purchase from us are serial number coded to your name and contact number and is valid for 1 year. You will only need to send the item back to us for warranty claim. We are moving green and the less paper we use, we give it back to mother nature. You can keep the receipt for reference and can be printed out from our webpage. Thank you.

Hey Bro, thank you for your review. We are glad that you really like your purchases. If you have any queries, feel free to contact us. We will be happy to assist you.

Hi, unfortunately no we do not carry hifonics. We are looking into JL audio, Kicker, RE Audio and other US brands. Once we get a competitive price we will be bringing them in.

Would personally recommend to check out RE audio. Top notch stuff at a great price.