Vintage McIntosh MQ 101 Environmental Equalizer MQ101 EQ w/ for sale in Bedford, TX
Vintage McIntosh MQ 101 Environmental Equalizer MQ101 EQ w/ Original Box, Manual Fully tested and 100% functional. All bulbs are fully working as well. 1 owner and serviced by Fort worth audio in 2019. This vintage EQ was designed to work with the classic McIntosh ML-1C speaker pair. It greatly improves the sound of those speakers. However, it can also be used with other speakers and will offer subtle low, mid and high frequency boost. Cosmetically, it is overall very, very good. . Includes original box, packing and manuals. Below is more info as well as specs on this unit. It will be properly packed and double boxed It will be shipped promptly to the buyer upon receipt of payment. The MQ101 Environmental Equalizer The MQ101 Environmental Equalizer has an illuminated glass panel that matches the appearance and width of other McIntosh electronics. It also has Panloc fasteners that allow it to be locked in place in the cabinet or it can be unlocked to slide out. It is shipped complete with a wood cabinet. It can also be custom mounted using the panloc brackets from the cabinet. There is no power switch in the MQ101. It can be plugged to a switched outlet in the preamplifier or receiver. The MQ101 also has mid and high frequency controls. Some speaker systems have controls for the mid and tweeter that are part of the crossover network. These controls or switches are located at the rear of the cabinet that require reaching behind each speaker to make an adjustment. In addition, the potentiometers or switches that are used often become intermittent. The speaker system impedance also changes with various settings, sometimes going too low. In addition, the frequency range covered by each control is limited by the frequency range and efficiency of the mid or tweeter in the system. In comparison, the MQ101 mid frequency and high frequency controls can be remotely adjusted, do not affect the impedance, and avoid high currents. The frequency band for the mid and high frequencies is not limited to only the frequency range or efficiency of the mid or tweeter. It covers a range that relates better to music. The input to the MQ101 normally comes from the preamplifier main output. The output from the MQ101 then goes to the power amplifier input. However, when used with a receiver, access to the preamp output and power amp input is not always available. A way around this is to use the tape monitor section of the receiver. Tape Out from the receiver goes to the MQ101 input and the MQ101 output goes to Tape In on the receiver. The tape monitor switch in the receiver must then be left at the IN position. The Tape monitor function in the receiver is, of course, lost. A tape monitor switch on the front panel of the MQ101 is provided to restore this feature. Input and output jacks are located at the rear of the MQ101. When The MQ101 is used with the tape monitor circuit, this would be equivalent to driving the MQ101 with the volume of the preamplifier up full. The MQ101 can then be overdriven. A three position input attenuator slide switch is at the left side in the rear. It is normally used in the 0dB position but when the MQ101 is driven by the tape monitor output, the switch must be placed in the -12dB position. Response: 20Hz to 20,000Hz (+0.5 -0.5dB) Distortion: 0.1% Hum and noise: -80dB Input sensitivity: 2.5V Input impedance: 60k ohms Input attenuator switch: 0dB, -6dB and -12dB Output: 2.5V into 47k ohms Tape monitor: inputs and outputs with switch Equalization low frequency: 0 to +17dB at 20Hz in 5 steps (0, +6, +9, +13 and +17dB) Equalization mid frequency: -5 to +5dB at 4000Hz in 5 equal steps Equalization high frequency: -4 to +4dB at 20kHz in 5 equal steps Front panel: illuminated gold/teal with Panloc mounting Size: 2-15/16" high, 16" wide and 10" deep (1-1/2" knob clearance) Cabinet size: 3-1/2" high, 16-5/8" wide and 9-3/8" deep Weight: 15 lb. Sold from: 1970-1978
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