Stereo Polychorus - Audio effect pedal Electro Harmonix - Free user manual and instructions

Product Type	Stereo Chorus/Flanger Pedal
Brand	Electro Harmonix
Model	Stereo Polychorus
Dimensions (Width x Depth x Height)	4.5 in x 3.5 in x 2.25 in (11.4 cm x 8.9 cm x 5.7 cm)
Weight	1.1 lb (0.5 kg)
Power Supply	9V DC, center negative, 100 mA minimum
Battery	9V Alkaline (not included)
Inputs	1/4" mono instrument input, 1/4" stereo input (TRS)
Outputs	1/4" left output, 1/4" right output (stereo); 1/4" mono output
Controls	Rate, Depth, Delay, Feedback, Blend, Filter, Mode switch (Chorus/Flanger/Filter Matrix)
Bypass	True bypass (electromechanical relay)
LED Indicator	Red LED for power/effect status
Chassis Material	Aluminum die-cast
Color	Black with white graphics
Mode Options	Chorus, Flanger, Filter Matrix, and Stereo modes
Frequency Response	20 Hz – 20 kHz
Signal to Noise Ratio	>95 dB
Current Draw	90 mA
Included Accessories	User manual, 9V DC power supply (optional, not included)
Warranty	1 year limited warranty
Country of Origin	USA
Recommended Maintenance	Keep clean, avoid moisture, use quality power supply
Safety Certifications	CE, FCC compliant

Frequently Asked Questions - Stereo Polychorus Electro Harmonix

How do I power the Stereo Polychorus?

Use a 9V DC power supply with center negative polarity and at least 100 mA current. Alternatively, use a 9V alkaline battery (not included). Do not use a higher voltage power supply as it may damage the pedal.

What is the difference between Chorus and Flanger modes?

Chorus mode provides a thicker, shimmering effect by mixing the dry signal with a slightly detuned copy. Flanger mode produces a sweeping, jet-like sound with more pronounced comb filtering. The Mode switch toggles between these and Filter Matrix.

Can I use the Stereo Polychorus with a mono setup?

Yes, you can use the 1/4' mono output or just the left output. The pedal sums the stereo signal to mono if only one output is connected.

How do I achieve true bypass?

The Stereo Polychorus features true bypass via an electromechanical relay. When the effect is off, your signal goes directly from input to output without any coloration, even without power.

What do the Knobs on top control?

Rate adjusts the speed of modulation. Depth controls intensity. Delay sets the time between original and modulated signal. Feedback adds regeneration. Blend mixes dry and wet signal. Filter adjusts the tone of the effect.

How do I clean the pedal?

Unplug the pedal and wipe the exterior with a dry, soft cloth. Avoid using solvents or abrasive cleaners. Keep the jacks and power connector free of dust.

Does the pedal work with bass guitars?

Yes, the Stereo Polychorus works well with bass, guitar, synthesizers, and other line-level instruments. Its frequency response covers the full audio range.

What is the Filter Matrix mode?

Filter Matrix is a unique mode that combines flanging with a resonant filter sweep, creating dramatic, filter-like effects. It responds to playing dynamics.

Why is the LED not lighting up?

Check the power supply connection and ensure the pedal is receiving voltage (9V DC, center negative). If using a battery, replace it. The LED indicates power and effect status. If still off, consult the manual or contact support.

Can I daisy chain multiple pedals with this?

Yes, but ensure the total current draw of all pedals does not exceed your power supply's capacity. The Stereo Polychorus draws 90 mA, so plan accordingly. Use a quality isolated power supply for best noise performance.

USER MANUAL Stereo Polychorus Electro Harmonix

Congratulations on your purchase of the multi-purpose Stereo Polychorus. Carefully reading these instructions will ensure full use of the tremendous variety of superb effects, which have been engineered into this state-of-the-art device.

WARNING: Your Stereo Polychorus XO comes equipped with an Electro-Harmonix 9.6DC-200BI power supply (same as used by Boss® & Ibanez®: 9.6 VDC/200 mA). The Stereo Polychorus XO requires 110 mA at 9VDC with a center negative plug. The Stereo Polychorus does not take batteries. Using the wrong adapter may damage your unit and void the warranty.

The STEREO POLYCHORUS's four switch-selectable modes are:

FILTER MATRIX- A comb filter, which creates "chime" effects. In this mode you can sweep the TUNE knob manually for "custom" flanging.

FLANGE – A sweeping comb filter which creates a variety of modulation effects and whooshing sounds.

CHORUS- A sweeping echo for moving sounds such as "12 string guitar" and rotating speaker effects.

DOUBLE TRACK- A short-delay echo for spacious "stage effects".

Plug the supplied AC adapter supplied into your Polychorus. Connect your instrument or microphone to the INPUT jack and your amplifier to the MAIN OUT jack (for an amazing stereo effect, connect a second amplifier to OUTPUT 2 simultaneously).

Press the BYPASS FOOTSWITCH to engage the effect. The status LED located above the footswitch will light up. Press the footswitch again to switch back to bypass mode, the LED shuts off.

FILTER MATRIX- Select FILTER MATRIX mode. The TUNE control will shift the effect from a high airy tone clockwise (CW) to a rich tone counterclockwise (CCW). While the RATE control has no effect in this mode, turning the TUNE control will produce a manual or "custom" flange. The FEEDBACK control determines how much of the processed signal is mixed in or "fed back" to the input. In FILTER MATRIX, turning FEEDBACK CW will "sharpen" or increase the intensity of the effect. CAUTION: In the extreme CW position the FEEDBACK control may cause oscillation, a squealing or roaring sound. This is normal, and may be stopped by backing off the FEEDBACK control.

FLANGE - Turn the MODE switch to the FLANGE position. The RATE control determines how fast the comb filter sweeps up and down through its pitch range. Turned fully CW, the

frequency is about ten cycles per second. Turned fully CCW, the sweep is slow, about one cycle every ten seconds. The pitch range of the sweep is set by the combined action of the WIDTH and TUNE knobs: The TUNE control sets the center frequency, and the WIDTH control determines how far the sweep goes. Maximum TUNE range is obtained by setting the WIDTH knob fully CW. The FEEDBACK knob also operates as in FILTER MATRIX.

CHORUS - When CHORUS mode is selected, the FEEDBACK knob determines the number of echoes: CCW for a single repeat, CW for more. The TUNE control will increase the delay time of the echo as it is turned CW. The WIDTH control maximizes the delay range of the TUNE control in its CW position, and emphasizes the modulating character of the CHORUS effect as it is turned more CW. The RATE control operates as in FLANGE.

DOUBLE TRACK – In this mode, all controls operate as in CHORUS mode, except that this is purely an echo effect and the RATE control is disengaged.

SWEEP FILTER – When set to ON, gives a smoother well rounded sound with a "liquid" sensation, if you set your unit to a very slow flange effect it is recommended to turn this off.

MAIN OUT & OUTPUT 2 – MAIN OUT is for standard effect usage. For a total spacious stereo effect, connect OUTPUT 2 to a second amplifier or a second channel on the same amplifier.

9V PWR JACK – Connect the output plug of the supplied AC Adapter into the 9V power jack at the top of the Stereo Polychorus. The Stereo Polychorus draws 110 mA of current from 9 VDC. The polarity of the power jack is center negative. The maximum allowable power supply voltage is 12.0 VDC.

Use the following diagrams to quickly set up several of the basic dramatic effects of the STEREO POLYCHORUS. When you have created these sounds, you will be ready to tailor your own special settings of the STEREO POLYCHORUS's many possibilities.

- WARRANTY INFORMATION -

Please register online at http://www.ehx.com/product-registration or complete and return the enclosed warranty card within 10 days of purchase. Electro-Harmonix will repair or replace, at its discretion, a product that fails to operate due to defects in materials or workmanship for a period of one year from date of purchase. This applies only to original purchasers who have bought their product from an authorized Electro-Harmonix retailer. Repaired or replaced units will then be warranted for the unexpired portion of the original warranty term.

If you should need to return your unit for service within the warranty period, please contact the appropriate office listed below. Customers outside the regions listed below, please contact EHX Customer Service for information on warranty repairs at [e-mail] or [phone]. USA and Canadian customers: please obtain a Return Authorization Number (RA#) from EHX Customer Service before returning your product. Include with your returned unit: a written description of the problem as well as your name, address, telephone number, e-mail address, and RA#; and a copy of your receipt clearly showing the purchase date.

United States & Canada

EHX CUSTOMER SERVICE

ELECTRO-HARMONIX

c/o NEW SENSOR CORP.

47-50 33RD STREET

LONG ISLAND CITY, NY 11101

Tel: [phone]

Email: [e-mail]

Europe

JOHN WILLIAMS

ELECTRO-HARMONIX UK

13 CWMDONKIN TERRACE

SWANSEA SA2 0RQ

UNITED KINGDOM

Tel: [phone]

Email: [e-mail]

This warranty gives a purchaser specific legal rights. A purchaser may have even greater rights depending upon the laws of the jurisdiction within which the product was purchased.

To hear demos on all EHX pedals visit us on the web at www.ehx.com

Email us at [e-mail]

- FCC COMPLIANCE -

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. If the device is not installed and used in accordance with the instructions, it may cause harmful interference to radio communications and void the user's authority to guarantee the equipment.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

● Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.

Modifications not expressly approved by the manufacturer could void the user's authority to operate the equipment under FCC rules.