Both these new DPower Amplifiers are only £199.99 each: from CarAudioStuff.co.uk
Hertz DPower 4
With all the attributes of Hertz renowned clean power, the DPower 4 makes it easy to upgrade stodgy, standard audio to something far more engaging and musical. The compact size makes the DPower 4 easy to hide away and a smart auto turn on feature reduces wiring time. The DPower 4 provides 600 Watts Max. across its four channels into 4 Ohms and each channel is equipped with 12dB/octave Hi and Lo pass filters.
Hertz DPower 1
DPower 1 is a compact single channel amplifier perfect for adding bass to a standard car audio system. Its compact chassis and D Class efficiency suits the tightest spaces while delivering big performance. With Smart Auto turn on and both high and low level inputs, it is quick and easy for your installer to wire in.
An optional remote subwoofer level control allows instant user adjustment on the go.