2 Channel Mixer

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Price: $225.00 USD + S&H  (Plus tax if shipping within New York state)
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Special Offer: We are so convinced that our 2 Channel Mixer is the perfect compliment to our Dual Band Optical Compressors that we are offering a $10 discount.  Click HERE for offer details and how to qualify.

DESCRIPTION:

The 2 Channel Mixer was designed to compliment and expand upon the output features of the FEA Dual Band Optical Compressors.  The FEA Dual Band Optical Compressor is an ideal crossover unit for bi-amplifying a guitar signal due to the compressors separate LO and HI outputs (Bi-amplifying is the method of sending low frequencies to one amplifier and high frequencies to another amplifier).  The FEA 2 Channel Mixer allows the two outputs of the FEA Dual Band Optical Compressor to be utilized in unique ways and then remixed for a single amplifier.  With the use of the Dual Band Optical Compressor and the 2 Channel Mixer the LO and HI signal paths are available for separate FX processors.  For example, a chorus FX pedal could be placed in the HI frequency signal path from the compressor to the FEA mixer.  This one scenario would keep the lowest frequencies dry and un-effected while adding chorus to the higher frequencies.  Having both the LO and HI signals available in this manner allows for the musician to create his or her own signature sounds.

FEATURES:

• Small footprint - 4 1/2 inches by 3 1/2 inches
• Input GAIN control on both mixer channels can be adjusted from -5dB to +12dB.
• Channel 2 has an adjustable PHASE control to correct for signal inversion from some FX pedals.  This is to help minimize frequency peaks and notches when mixed with channel 1 having a similar harmonic structure.
• Channel 2 has a footswitch to enable or disable the channel.  Channel 1 cannot be disabled and is always active.
• The BOOST amplifier is activated by the BOOST footswitch.  The BOOST amplifier can be set to either channel or both via the rotary selection switch.
• The jumper on the back of the circuit board enables a low pass filter in the BOOST circuit at 15KHz to help minimize white noise (hiss) while BOOST is activated.
• Output amplifier type is selected via a rotary selection switch.  There are two output amplifier topologies available in the 2 Channel Mixer.  The first type is the BJT, “class AB” output of the op-amp.  This amplifier is usually considered the most accurate and has a clean and sterile sound.  The second type is a discrete JFET “class A” amplifier.  Some prefer this type of amplifier for its sonic character resembling tube amplification.
• There are three clipping monitoring circuits for detecting excessive signal levels.  The clipping monitors will light before the signal actually clips and the monitor for channel 2 is always active, even if the channel is disabled by the footswitch.
  NOTE: If a clipping LED illuminates then the gain should be reduced for the affected channel or output.
• The 2 Channel Mixer has minimal components in the signal paths to maintain the utmost signal quality.   All resistors in the circuit are low noise 1% metal film type. The signal coupling capacitors are tight tolerance, quiet, multi-layer and metallized polyester film type. The operational amplifiers used in the signal path are JFET input, low-noise, low-distortion “hi-fi quality” devices.
• The power supplies onboard voltage charge pump allows the circuitry to operate at 18volts (+9 and –9 volt rails) from a single 9-volt battery or AC power adapter of 9 volts or greater. This allows the signal plenty of headroom from active electronic guitars and aggressive playing techniques (i.e. pop and slap).
• This pedal is unique in which the OUTPUT jack is used for turning the power ON when a plug is inserted in lieu of the more common INPUT jack switch.
• The onboard power supply can accommodate power adapter voltages up to 25 volts DC with protection from reversed polarity. The “switch on” power supply current is less than 1µA (micro amp) on the signal ground at the OUTPUT jack. This is approximately 45,000 times (-93dB) less than the commonly used method of connecting the battery’s negative terminal to ground via the sleeve of the plug inserted into the INPUT jack. The “switch on” sensing method used in the FEA 2 Channel Mixer keeps nearly all of the circuit’s generated white noise and transient currents out of the OUTPUT stage signal ground.  Extreme measures have been taken to keep the power and signal paths as clean as possible.
  NOTE: Unplug the cord from the OUTPUT jack when not in use to prolong battery life.
• The power and grounds for the signal path circuitry are separated from the clipping monitors circuit power and grounds to protect the audio signal from spurious noise. The power for the signal amplifiers is exceptionally clean, filtered twice for each rail and all filter stages are oversized.

MIXER BLOCK DIAGRAM:

TECHNICAL SPECIFICATIONS:

Notice:

Specifications and design are subject to change without notice.