[{"id":639668617375,"handle":"all-regularly-priced-items","updated_at":"2026-06-04T10:34:31-06:00","published_at":"2024-11-30T15:25:35-07:00","sort_order":"best-selling","template_suffix":null,"published_scope":"web","title":"All Regularly Priced Items","body_html":null},{"id":280456888479,"handle":"audio","updated_at":"2026-06-04T10:16:56-06:00","published_at":"2021-12-02T11:21:36-07:00","sort_order":"best-selling","template_suffix":"top-level","published_scope":"global","title":"Audio","body_html":"","image":{"created_at":"2022-01-06T15:53:45-07:00","alt":"audio","width":971,"height":386,"src":"\/\/listenup.com\/cdn\/shop\/collections\/audio.png?v=1641509626"}},{"id":302044283039,"handle":"moon-preamps-network-players-music-streamers","title":"MOON Preamplifiers","updated_at":"2026-06-01T22:16:45-06:00","body_html":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cb id=\"docs-internal-guid-63d01de0-7fff-4349-e6bf-f81fcf48bce1\"\u003e\u003ca href=\"https:\/\/listenup.com\/pages\/moon\"\u003e\u003cspan\u003eMOON\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, an exceptional range of sound systems and emotions. MOON Preamplifiers and the MOON North Collection are on display for auditions at four ListenUp locations. 877-744-1179 for MOON expertise. \u003c\/span\u003e\u003ca href=\"https:\/\/listenup.com\/pages\/reach-for-the-moon-trade-up-program\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eTrade-up to MOON\u003c\/span\u003e\u003c\/a\u003e.\u003c\/b\u003e\u003c\/p\u003e\n\u003c!----\u003e","published_at":"2024-07-18T17:12:14-06:00","sort_order":"best-selling","template_suffix":"","disjunctive":false,"rules":[{"column":"vendor","relation":"equals","condition":"MOON"},{"column":"vendor","relation":"equals","condition":"Moon"},{"column":"title","relation":"contains","condition":"Preamp"},{"column":"title","relation":"not_contains","condition":"open box"},{"column":"title","relation":"not_contains","condition":"phono"}],"published_scope":"global","image":{"created_at":"2024-07-18T17:12:13-06:00","alt":"MOON North Collection 891 Preamplifier\/Network Player","width":1800,"height":1800,"src":"\/\/listenup.com\/cdn\/shop\/collections\/891_front3.png?v=1721344333"}},{"id":302690500767,"handle":"moon-preamplifiers","title":"MOON Preamplifiers","updated_at":"2026-06-01T22:22:00-06:00","body_html":"","published_at":"2024-10-09T13:47:15-06:00","sort_order":"alpha-asc","template_suffix":"","disjunctive":false,"rules":[{"column":"title","relation":"contains","condition":"Preamp"},{"column":"vendor","relation":"equals","condition":"MOON"},{"column":"title","relation":"not_contains","condition":"clearance"}],"published_scope":"global"},{"id":280457314463,"handle":"preamps","updated_at":"2026-06-03T10:37:40-06:00","published_at":"2021-12-02T11:46:44-07:00","sort_order":"best-selling","template_suffix":"default","published_scope":"global","title":"Preamps","body_html":"\u003cp style=\"text-align: center;\"\u003eAudio preamps are essential devices in sound systems that amplify weak audio signals. They play a vital role in enhancing the signal-to-noise ratio and improving the overall audio quality. \u003cbr\u003ePreamps are designed to boost the incoming signal to a level that can be effectively processed by subsequent components in the audio chain. \u003cbr\u003eThey are commonly used in various applications, including recording studios, live sound systems, and home audio setups.\u003c\/p\u003e","image":{"created_at":"2022-01-04T15:30:31-07:00","alt":"Preamps","width":890,"height":353,"src":"\/\/listenup.com\/cdn\/shop\/collections\/preamps.png?v=1641335432"}},{"id":280456986783,"handle":"receivers-amplifiers","updated_at":"2026-06-04T10:09:49-06:00","published_at":"2021-12-02T11:25:03-07:00","sort_order":"best-selling","template_suffix":"top-level","published_scope":"global","title":"Receivers \u0026 Amplifiers","body_html":"","image":{"created_at":"2022-01-04T15:21:55-07:00","alt":"Receivers and Amplifiers","width":1146,"height":455,"src":"\/\/listenup.com\/cdn\/shop\/collections\/receivers-amplifiers.png?v=1641334915"}},{"id":301151355039,"handle":"welcome10","updated_at":"2026-06-04T10:41:11-06:00","published_at":"2024-07-02T15:18:25-06:00","sort_order":"best-selling","template_suffix":null,"published_scope":"web","title":"Welcome10","body_html":null}]
The MOON 850P is a reference dual-mono, fully balanced analog preamplifier engineered for extreme transparency and ultra-low noise. Its dual-chassis architecture isolates the power supply and control circuits from the audio path to preserve detail and accuracy. The M-Ray R-2R volume system delivers 530 precision steps, while i²DCf filtering and robust regulation keep backgrounds exceptionally quiet. With configurable home theater bypass, multiple XLR/RCA connections, and RS-232/SimLink/12V trigger integration, it’s built for elite two-channel and custom installations.
Get the Details
Features & Specs
Dual-chassis, dual-mono architecture
Separates power supply/controller functions from the audio circuitry and runs left/right channels independently to reduce interference and enhance channel separation and realism.
Fully balanced differential signal path
Built for high-performance balanced systems with 3 XLR input pairs and 2 XLR output pairs, improving noise rejection and preserving low-level detail over longer cable runs.
M-Ray discrete R-2R volume control (530 steps)
Uses a precision resistor-array approach designed to maintain sonic integrity at any listening level, with ultra-fine adjustment for exact matching and repeatable settings.
Advanced power regulation and filtering (i²DCf, 40 stages)
Applies inductive DC filtering across the audio signal path to keep the noise floor exceptionally low and the presentation clean, even in revealing systems.
System flexibility for real-world setups
Offers per-input gain offset (±10dB), per-input maximum volume lock (M-Lock), and per-input home theater bypass so multi-source and cinema integrations stay seamless and safe.
Custom integration ready
Provides RS-232 control/status (DB9), SimLink™ bi-directional communication, IR input for external receivers, and dual 12V trigger outputs to coordinate power and input behavior across a full system.
Dual-chassis, dual-mono architecture
Separates power supply/controller functions from the audio circuitry and runs left/right channels independently to reduce interference and enhance channel separation and realism.
Fully balanced differential signal path
Built for high-performance balanced systems with 3 XLR input pairs and 2 XLR output pairs, improving noise rejection and preserving low-level detail over longer cable runs.
M-Ray discrete R-2R volume control (530 steps)
Uses a precision resistor-array approach designed to maintain sonic integrity at any listening level, with ultra-fine adjustment for exact matching and repeatable settings.
Advanced power regulation and filtering (i²DCf, 40 stages)
Applies inductive DC filtering across the audio signal path to keep the noise floor exceptionally low and the presentation clean, even in revealing systems.
System flexibility for real-world setups
Offers per-input gain offset (±10dB), per-input maximum volume lock (M-Lock), and per-input home theater bypass so multi-source and cinema integrations stay seamless and safe.
Custom integration ready
Provides RS-232 control/status (DB9), SimLink™ bi-directional communication, IR input for external receivers, and dual 12V trigger outputs to coordinate power and input behavior across a full system.
Expert Insight
Earlier this year, I discovered that Simaudio had hit a home run with the Moon Evolution 880Ms. With the Moon Evolution 850P, they've swung for the fences again, and this time they've hit a grand slam. Very, very highly recommended.
Brian Damkroger
stereophile
Details
MOON 850P Preamplifier
The MOON 850P is a reference-grade, dual-mono analog preamplifier built to disappear in your system—delivering exceptional transparency, ultra-low noise, and uncolored musical detail. Its sophisticated two-chassis architecture separates the power supply/controller from the audio circuitry to preserve signal purity and maximize resolution. Inside, MOON’s M-Ray fully discrete R-2R volume control provides ultra-precise level matching across 530 steps, while i²DCf power regulation and extensive filtering keep the background pitch-black quiet. With fully balanced differential operation, flexible input configuration (including home theater bypass), and pro-level integration options, the 850P is engineered for demanding two-channel listening and high-end custom systems alike. The Moon 850P is part of ListenUp's MOON Preamplifier Collection.
Dimensions (each chassis): 18.75 x 4.0 x 16.5 in (W x H x D) / 47.6 x 10.0 x 41.9 cm
Comparison Chart Dimensions (W x H x D): 18.8 x 4.0 x 16.5 in and 18.8 x 4.0 x 17.0 in
Shipping Weight: 151 lb / 67 kg
In the Box: AC power cable; FRM-3 remote control with three AAA batteries; three color-coded chassis interconnect cables; SimLink™ cable (1/8" mini plugs); owner’s manual; warranty & registration info (USA/Canada only)
MOON 850P Q&A:
Is the MOON 850P a fully balanced preamplifier?
Yes. The 850P uses a fully balanced differential, dual-mono configuration designed to preserve signal integrity and reduce noise pickup—especially when using XLR connections.
What’s the benefit of the 850P’s two-chassis design?
The power supply/controller circuitry is housed in a separate chassis from the audio circuitry, helping isolate sensitive analog stages from electrical noise for improved accuracy and transparency.
How many inputs and outputs does it have?
It provides 3 pairs of balanced XLR inputs and 4 pairs of RCA line inputs, plus a dedicated RCA monitor/tape loop. Outputs include 2 pairs of balanced XLR (variable) and 2 pairs of RCA (one fixed, one variable).
Can I set up a home theater bypass input?
Yes. Each line input can be configured to be “home theater ready,” bypassing the 850P’s volume control so your AVR/processor can control level for that input.
How precise is the volume control?
Extremely precise—MOON’s M-Ray R-2R volume control offers 530 steps with 1dB and 0.1dB increments, plus per-input maximum volume lockout (M-Lock).
Does it support custom installation and automation?
Yes. It includes bi-directional RS-232 control/status, SimLink™ in/out for MOON component communication, an IR input for external receivers, and two 12V trigger outputs.
Does it include a tape/monitor loop for recording or external processors?
Yes. The 850P includes a single-ended (RCA) monitor/tape loop with dedicated input and output connectors for each channel.
What accessories come in the box?
You’ll receive an AC power cable, FRM-3 remote with AAA batteries, three color-coded chassis interconnect cables, a SimLink cable, the owner’s manual, and warranty/registration information (USA/Canada only).
The MOON 850P is a reference dual-mono, fully balanced analog preamplifier engineered for extreme transparency and ultra-low noise. Its dual-chassis architecture isolates the power supply and control circuits from the audio path to preserve detail and accuracy. The M-Ray R-2R volume system delivers 530 precision steps, while i²DCf filtering and robust regulation keep backgrounds exceptionally quiet. With configurable home theater bypass, multiple XLR/RCA connections, and RS-232/SimLink/12V trigger integration, it’s built for elite two-channel and custom installations.
Get the Details
Features & Specs
Features & Specs
Dual-chassis, dual-mono architecture
Separates power supply/controller functions from the audio circuitry and runs left/right channels independently to reduce interference and enhance channel separation and realism.
Fully balanced differential signal path
Built for high-performance balanced systems with 3 XLR input pairs and 2 XLR output pairs, improving noise rejection and preserving low-level detail over longer cable runs.
M-Ray discrete R-2R volume control (530 steps)
Uses a precision resistor-array approach designed to maintain sonic integrity at any listening level, with ultra-fine adjustment for exact matching and repeatable settings.
Advanced power regulation and filtering (i²DCf, 40 stages)
Applies inductive DC filtering across the audio signal path to keep the noise floor exceptionally low and the presentation clean, even in revealing systems.
System flexibility for real-world setups
Offers per-input gain offset (±10dB), per-input maximum volume lock (M-Lock), and per-input home theater bypass so multi-source and cinema integrations stay seamless and safe.
Custom integration ready
Provides RS-232 control/status (DB9), SimLink™ bi-directional communication, IR input for external receivers, and dual 12V trigger outputs to coordinate power and input behavior across a full system.
Dual-chassis, dual-mono architecture
Separates power supply/controller functions from the audio circuitry and runs left/right channels independently to reduce interference and enhance channel separation and realism.
Fully balanced differential signal path
Built for high-performance balanced systems with 3 XLR input pairs and 2 XLR output pairs, improving noise rejection and preserving low-level detail over longer cable runs.
M-Ray discrete R-2R volume control (530 steps)
Uses a precision resistor-array approach designed to maintain sonic integrity at any listening level, with ultra-fine adjustment for exact matching and repeatable settings.
Advanced power regulation and filtering (i²DCf, 40 stages)
Applies inductive DC filtering across the audio signal path to keep the noise floor exceptionally low and the presentation clean, even in revealing systems.
System flexibility for real-world setups
Offers per-input gain offset (±10dB), per-input maximum volume lock (M-Lock), and per-input home theater bypass so multi-source and cinema integrations stay seamless and safe.
Custom integration ready
Provides RS-232 control/status (DB9), SimLink™ bi-directional communication, IR input for external receivers, and dual 12V trigger outputs to coordinate power and input behavior across a full system.
Expert Insight
Expert Insight
Earlier this year, I discovered that Simaudio had hit a home run with the Moon Evolution 880Ms. With the Moon Evolution 850P, they've swung for the fences again, and this time they've hit a grand slam. Very, very highly recommended.
Brian Damkroger
stereophile
Details
Details
MOON 850P Preamplifier
The MOON 850P is a reference-grade, dual-mono analog preamplifier built to disappear in your system—delivering exceptional transparency, ultra-low noise, and uncolored musical detail. Its sophisticated two-chassis architecture separates the power supply/controller from the audio circuitry to preserve signal purity and maximize resolution. Inside, MOON’s M-Ray fully discrete R-2R volume control provides ultra-precise level matching across 530 steps, while i²DCf power regulation and extensive filtering keep the background pitch-black quiet. With fully balanced differential operation, flexible input configuration (including home theater bypass), and pro-level integration options, the 850P is engineered for demanding two-channel listening and high-end custom systems alike. The Moon 850P is part of ListenUp's MOON Preamplifier Collection.
Dimensions (each chassis): 18.75 x 4.0 x 16.5 in (W x H x D) / 47.6 x 10.0 x 41.9 cm
Comparison Chart Dimensions (W x H x D): 18.8 x 4.0 x 16.5 in and 18.8 x 4.0 x 17.0 in
Shipping Weight: 151 lb / 67 kg
In the Box: AC power cable; FRM-3 remote control with three AAA batteries; three color-coded chassis interconnect cables; SimLink™ cable (1/8" mini plugs); owner’s manual; warranty & registration info (USA/Canada only)
MOON 850P Q&A:
Is the MOON 850P a fully balanced preamplifier?
Yes. The 850P uses a fully balanced differential, dual-mono configuration designed to preserve signal integrity and reduce noise pickup—especially when using XLR connections.
What’s the benefit of the 850P’s two-chassis design?
The power supply/controller circuitry is housed in a separate chassis from the audio circuitry, helping isolate sensitive analog stages from electrical noise for improved accuracy and transparency.
How many inputs and outputs does it have?
It provides 3 pairs of balanced XLR inputs and 4 pairs of RCA line inputs, plus a dedicated RCA monitor/tape loop. Outputs include 2 pairs of balanced XLR (variable) and 2 pairs of RCA (one fixed, one variable).
Can I set up a home theater bypass input?
Yes. Each line input can be configured to be “home theater ready,” bypassing the 850P’s volume control so your AVR/processor can control level for that input.
How precise is the volume control?
Extremely precise—MOON’s M-Ray R-2R volume control offers 530 steps with 1dB and 0.1dB increments, plus per-input maximum volume lockout (M-Lock).
Does it support custom installation and automation?
Yes. It includes bi-directional RS-232 control/status, SimLink™ in/out for MOON component communication, an IR input for external receivers, and two 12V trigger outputs.
Does it include a tape/monitor loop for recording or external processors?
Yes. The 850P includes a single-ended (RCA) monitor/tape loop with dedicated input and output connectors for each channel.
What accessories come in the box?
You’ll receive an AC power cable, FRM-3 remote with AAA batteries, three color-coded chassis interconnect cables, a SimLink cable, the owner’s manual, and warranty/registration information (USA/Canada only).
In Store Only
