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In 1970 the SP-1 stereo preamplifier broke new ground in the high resolution playback of stereo music recordings. A generation later, the MP1 breaks new ground in the high-resolution playback of multichannel music recordings, having been created in response to the proliferation of multichannel SACD and DVD-A players which output six analog channels. The MP1 will be appreciated by the most discriminating music lovers, offering control flexibility and an extraordinarily high level of performance which is simply not available from other multichannel analog or digital products.

As one would expect from a preamplifier of this caliber, many circuit details have been derived from the Reference 2 MKII and LS25MKII stereo line stages. The pure Class-A circuitry is fully balanced in a double-differential design, utilizing all-FET circuits with unity-gain buffers between stages and a double-buffered output. Low-noise, high-transconductance JFETS are used for all audio circuits, with local FET constant-current stabilization for each stage. The audio circuit is DC coupled throughout, with servo stabilization for low offset and subsonic control. The massive power supplies have ten wideband and high headroom audio regulators utilizing constant-current source stabilization. Total gain is 15dB balanced, 9dB single-ended output.

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