It seems to me that one channel is outputting at a lower volume. I’ve read on the forums that this is a super common issue and it just needs to be taken apart and have some deoxit applied. I don’t have the time nor desire to do that so selling at a deep discount. If you don’t mind a small electronics project and need an other wise SOLID phono preamp and want to save some money please consider this unit.
NAD PP 4 Digital Phono USB Preamplifier – Summit Hi-Fi
NAD PP 4 Digital Phono USB Preamplifier; A/D Converter (Open Box) - The Music Room
PK Power AC/DC Adapter for NAD PP-1 PP1 PP 2e PP2e Phono Preamp Amplifier Power Supply Cord Cable PS Wall Home Charger Mains PSU : Electronics
New 24V AC/DC Adapter for NAD PP-1 PP1 PP-2 PP2 PP 2e PP2e PP 4 PP4 Phono USB Preamplifier PreAmp Pre-Amp Amplifier Pre-Amplifier 24 VDC 100mA 23.5VDC 600mA 23.5V - 24VDC
NAD PP3 Phono USB Preamp with AC Adapter
Audio Preamplifier - Best Buy
NAD PP4 - Phono Preamplifier & USB ADC
NAD PP4 / PP 4 - Digital Phono USB Preamplifier Vinyl LP to WAV PC MAC
NAD PP 3i Phono preamplifier with USB output at Crutchfield
New 24V AC/DC Adapter for NAD PP-1 PP1 PP-2 PP2 PP 2e PP2e PP 4 PP4 Phono USB Preamplifier PreAmp Pre-Amp Amplifier Pre-Amplifier 24 VDC 100mA 23.5VDC 600mA 23.5V - 24VDC
NAD PP4 Digital Phono USB Preamplifier : Electronics
NAD PP-4 Digital Phono/USB Preamplifier
NAD PP4 Digital Phono / USB Preamp – Upscale Audio
NAD PP 4 Phono Preamp USB analog to digital converter 1 owner in box For Sale - US Audio Mart