The MQ104 is a beautiful chrome topped piece of gear. It's a dedicated, programmable, four band EQ designed to to optimize the low frequency response of McIntosh speakers. It will, of course, work with any speakers you're using. As Mac collectors ourselves, it's a must have piece of bling to add to any collection.
- Production
- 1977-91
- Condition
- 9/10
- Serial No.
- AM4234
- Orig. MSRP
- 500.0
- Restoration
- Full service check
- This EQ works properly with the present capacitors
- Factory Specs
Frequency Response 20Hz to 20,000Hz with equalization set flat.
Hum and Noise 90 dB (79uV) below rated output of 2.5V. Worst case setting, 85 dB (140uV) below rated output of 2.5V.
Harmonic and IM Distortion less than 0.1% at rated output of 2.5V from 20 to 20,000Hz
Low Frequency Compensation 5 steps are included for early McIntosh speakers, allowing 0 to +17 at 20Hz.
Input Sensitivity and Impedance 2.5 volts into 27,000 ohms for rated output with controls set for flat response.
Output level and Impedance 2.5 volts into 27,000 ohms or more with controls set for flat response. Output source impedance is 600 ohms.
Programmable Filters 8 sections (4 per channel) each of which can be programmed for 1/3 octave center frequencies from 20Hz to 1000Hz. Filter bandwidth is programmable for narrow (approx.1/3 octave) or wide (approx. 1 octave). Amplitude is continuously adjustable +/- 12 dB for narrow and +/- 15 dB for wide. A dented control is used to position for flat response. Programming is achieved by means of plug-in capacitors provided with the MQ104.
Chassis Chrome and Black
Weight 4-3/4 lbs.
- Documentation
McIntosh MQ104 Catalog Page
- The History of McIntosh
- Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
- Liner Notes
- The McIntosh MQ 104 is a dedicated equalizer to optimize low-frequency response of certain McIntosh loudspeaker systems, as well as programmable four-band per channel third or full octave equalizer. It came out around 1980.Each channel has four selectable levels of low-frequency boost, or sets flat. These only boost below 100 cycles and boost strongly down to 20 cycles. A 14-cycle infrasonic filter rolls-off response below 20 cycles.Each of the four programmable third- or full-octave bands may be set to any frequency and set to third or full octave bandwidth using the included set of plug-in capacitors. For instance, with my B&W 801, while I use a 33-band third-octave equalizer, I only use the 16, 25, 40 and 8,000 cycle bands along with a dedicated compensation filter I designed to get flat response to 16 cycles, meaning that the four bands of this equalizer are actually all I need.It has a mute relay with a 2.2 second turn-on delay.The EQ IN-OUT switch neutralizes the four hidden, center-detented rotary potentiometers of the 4-band programmable equalizer. The IN-OUT switch does not bypass this equalizer and does not cancel the low-frequency boost selected with the knobs.
- Stock No.
- 8834223735005
The MQ104 is a beautiful chrome topped piece of gear. It's a dedicated, programmable, four band EQ designed to to optimize the low frequency response of McIntosh speakers. It will, of course, work with any speakers you're using. As Mac collectors ourselves, it's a must have piece of bling to add to any collection.
Production
1977-91
Condition
9/10
Serial No.
AM4234
Orig. MSRP
500.0
Restoration
- Full service check
- This EQ works properly with the present capacitors
Factory Specs
Frequency Response 20Hz to 20,000Hz with equalization set flat.
Hum and Noise 90 dB (79uV) below rated output of 2.5V. Worst case setting, 85 dB (140uV) below rated output of 2.5V.
Harmonic and IM Distortion less than 0.1% at rated output of 2.5V from 20 to 20,000Hz
Low Frequency Compensation 5 steps are included for early McIntosh speakers, allowing 0 to +17 at 20Hz.
Input Sensitivity and Impedance 2.5 volts into 27,000 ohms for rated output with controls set for flat response.
Output level and Impedance 2.5 volts into 27,000 ohms or more with controls set for flat response. Output source impedance is 600 ohms.
Programmable Filters 8 sections (4 per channel) each of which can be programmed for 1/3 octave center frequencies from 20Hz to 1000Hz. Filter bandwidth is programmable for narrow (approx.1/3 octave) or wide (approx. 1 octave). Amplitude is continuously adjustable +/- 12 dB for narrow and +/- 15 dB for wide. A dented control is used to position for flat response. Programming is achieved by means of plug-in capacitors provided with the MQ104.
Chassis Chrome and Black
Weight 4-3/4 lbs.
Documentation
McIntosh MQ104 Catalog Page
The History of McIntosh
Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
Liner Notes
The McIntosh MQ 104 is a dedicated equalizer to optimize low-frequency response of certain McIntosh loudspeaker systems, as well as programmable four-band per channel third or full octave equalizer. It came out around 1980.Each channel has four selectable levels of low-frequency boost, or sets flat. These only boost below 100 cycles and boost strongly down to 20 cycles. A 14-cycle infrasonic filter rolls-off response below 20 cycles.Each of the four programmable third- or full-octave bands may be set to any frequency and set to third or full octave bandwidth using the included set of plug-in capacitors. For instance, with my B&W 801, while I use a 33-band third-octave equalizer, I only use the 16, 25, 40 and 8,000 cycle bands along with a dedicated compensation filter I designed to get flat response to 16 cycles, meaning that the four bands of this equalizer are actually all I need.It has a mute relay with a 2.2 second turn-on delay.The EQ IN-OUT switch neutralizes the four hidden, center-detented rotary potentiometers of the 4-band programmable equalizer. The IN-OUT switch does not bypass this equalizer and does not cancel the low-frequency boost selected with the knobs.
Stock No.
8834223735005
