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The Quad 909 power amplifier is a wonderful 140wpc power amp (250 watts into 4 ohms), with a midrange unsurpassed in its price range which The Abso!ute Sound review compares to $4000 tube amps. The 909 uses a unique technology called current dumping which has a very high-quality but small class A amplifier driving a high-current efficient class B amplifier. The result is the sound of class A with the power of class B. Again the midrange performance is superb. Bass, treble and resolution are good for the price but not exceptional. In addition we have many complaints about the speaker binding posts. Our Level-2 mod turns the 909 into a superb amp with bass and treble on a par with its superb midrange. We also upgrade the binding posts to quality Cardas posts. Our mod was designed by Chris Johnson, founder and former president of Sonic Frontiers.