CI Audio PEQ-1 MKII MM/MC Phono Preamplifier

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CI Audio PEQ-1 MKII MM/MC Phono Preamplifier

by CI Audio

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CI Audio
PEQ-1 MKII MM/MC Phono Preamplifier

Have a question about this product? Please email our audio advisor or call 1-877-929-8729 with any questions or concerns regarding your equipment purchase.

Channel Islands Audio is proud to announce the release of our long-awaited PEQ•1 MKII MM/MC Phono Preamplifier!


  • Ultra-Low noise
  • Ultra-Low harmonic & intermodulation distortion (THD/IMD)
  • Dual-Mono Design for low crosstalk
  • Heavy steel faraday cage for high resistance to electromagnetic and radio frequency interference
  • Rear panel DIP switches for convenient configuration & adjustment
  • 5 Year Warranty
  • Handcrafted in USA

The PEQ•1 is a versatile design offering outstanding performance with a wide variety of phono cartridge types.

This new dual-mono design is aimed at music lovers seeking the utmost life-like performance from their vinyl collection. Dynamic and detailed, yet smooth and rich, with soundstage and imaging to create realism rarely heard.


The internal design of PEQ•1 starts with a dual AC input (one for each channel).

When the outboard power supply is connected, the AC is fed to two independent filter/regulation circuits (1 per channel). These circuits feed the L & R audio stages with ultra-low noise on par with the best battery technologies, and without the inconvenience. There is also a Chassis Ground switch to optimize chassis shielding.

The standard AC supply is an AC wall adapter type with a single winding feeding the L&R circuits.

This supply is 120V input only.

Countries with 220~240V mains must use the AC·15 MKII Upgrade Supply.

The AC·15 MKII Upgrade Supply Features:

  • Large Toroidal Transformer with dual outputs (1 per channel)
  • AC Line Filtering
  • Dual common-mode choke filtering (1 per channel)
  • 120V/240V Selectable Input Voltage
  • Rear Panel Power Switch
  • Detachable AC Input & Output cables

Audio Circuit

Input signals are connected via highest quality Cardas™ panel-mounted RCA jacks. The input jacks are routed to two independent mono circuits of identical layout. This assures exact performance from both channels and reduces crosstalk.

Circuit topology consists of an input gain stage with selectable resistive load, capacitance, gain, and subsonic filter. This gain stage is followed by a passive high frequency cut, then an active bass boost to create the RIAA equalization curve, then to the output jacks.

Careful layout yields a very short signal path from input to output, and a combination of star grounding power supply components/ground plane for the audio circuits, result in a silent background and immunity to EMI/RFI pickup. The entire circuit board is then housed in a heavy steel faraday cage to further reject outside interference, then inside the attractive aluminum outer chassis.

Highest quality components are used throughout:

Cardas™ jacks, Nichicon Muse™ NP power supply capacitors, Vishay™ 2% Polypropylene signal and bypass capacitors, Takman™ metal film & carbon films resistors, and Grayhill™ switches.

5 Year Warranty

Enjoy peace of mind with our comprehensive 5 year warranty. Full service information is included in the product manual.

8.50″W x 2.75″H x 6.50″D

10 lbs

RIAA Accuracy: +/- 0.2 dB
THD + Noise: < .002% (1kHz Unweighted/45dB gain/10mV)
IMD: < .002% (SMPTE)
Crosstalk: > 108dB
Cartridge Loading: Resistance: 47KΩ • 10KΩ • 1Ω • 100Ω Capacitance: 100pf • 270pf • 370pf
Gain: 45dB • 60dB
Subsonic Filter: -3dB @ 18Hz
Output Impedance: 100 ohms
Operating Voltage: 120V AC Input • 14V AC Output (Standard Supply)
Power Consumption: -< 4.0 Watts
Options: AC•15 MKII Upgrade Power Supply * Selectable 120/240V AC Input Voltage * 2 x 14V AC Filtered Output Voltage
"The level of musical finesse and enjoyment that the PEQ does offer is unmatched by anything I’ve yet experienced at anything near this price. Even if you were planning on spending close to $3k on a phonostage, give the PEQ a spin. If your love affair begins here, that’s a lot of extra money for a better cartridge or some more records. Channel Islands factory direct model (with 30-day return guarantee) assures maximum value. All CI products carry a 5-year warranty, and I can speak from personal experience, CI gear doesn’t break… [Read More]"
- TONEAudio

"“The highest compliment I can pay the CiAudio PEQ 1 MKII is that it sounds as if its creator actually listened as he designed instead of just measuring. This is a fun to listen to, non-mechanical sounding phono preamplifier that delivers genuine musical pleasure and performs well beyond its pay grade.[Read More]"
-- Michael Fremer (Analog Planet)

Click to read the PEQ-1 MKII MM/MC Manual.

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