Nelson Pass First Watt F4 25W Class A Amplifier, built inside NAD 208 case. Smooth detailed sound not for low efficiency speakers. Like everything else from First Watt the F4 is a unique amplifier. It has no feedback and no voltage gain, only current gain, it will deliver up to 25 watts into 8 ohms and 50 watts into 4 ohms. It is built as dual-mono circuit boards, powered by a 500w toroidal transformer and filtered with 86000uf per channel. It has a soft starter with thermal protection, speaker protection, rhodium plated RCA and banana sockets, input and output wires are silver plated OFC. The combination of a simple Class A circuit operated without feedback and the good objective performance gives us a superb sounding amplifier. The low distortion, bandwidth extension, and high damping results in midrange clarity, treble detail, and control on the bottom end. While these are available from most good solid state amplifiers, the F4 also brings depth, imaging, midrange warmth and top-end sweetness.

2X Low Pass Bass Subwoofer Preamp Amplifier Board Single DC 9-32V PreampliV5F4 The so-called low-pass filter to filter out the human voice board is more than treble part, retain the low frequency part is amplified to improve the bass reproduction efforts, people will not hear the sound of musical instruments and high-frequency sound during playback. The buyer must understand knowledge of this area.Power supply voltage: DC 9V-32V single power supplyDual channel input, subwoofer output, then the output amp|ifier,can not directly connected to the speakerThe multi-stage filter, better bass effect.The phase adjustablePotentiometer from left to right: frequency adjustment, bass volume controlThe cut-off frequency: 22HZ-240HZPotentiometer shaft center to center spacing: 3cmOP AMP:TL072size: 6.2 x 2.6cmMaterial:ABScolour:As shownPackage Contents:2 x Low Pass Filter

NELSON PASS FIRST WATT F4POWER AMPLIFIER The First Watt F4 is a classic Nelson Pass/First Watt design with JFET inputs and MOS-FET outputs. However, as with the other FW amps there is a twist here, namely that the F4 has no voltage gain. That means it’s essentially a buffer than can provide a full 25W class A output. its low or no gain so needs a preamp with a decent output Track Page Views WithAuctivas Counter