Heritage Audio 8173 80 Series EQ Module - Long & McQuade Musical Instruments
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Heritage Audio 8173 80 Series EQ Module

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SKU: # 721429
Model: #


Your Price: $3,699.00 CDN



The Heritage Audio 8173 Microphone Preamplifier Module is a hybrid 80 series console-compatible module that combines an 80 dB microphone and 10 dB line recording preamplifier with a 4-band EQ based on the vintage 1081 module designed by Rupert Neve. The module was designed so that a recording engineer could use the flexibility of the full spectrum 1081 EQ with the sound of the 1073's Class A amplification. This module features the same Class A circuitry, the same specifications, and the same construction techniques used in the original 1073.

The unit supports selectable HI-LO minimum balanced and floating input impedances that accommodate a range of microphone types including vintage ribbons. It includes a +/-16 dB selectable low-frequency Baxandall shelving EQ at 35 Hz, 60 Hz, 110 Hz, and 220 Hz. For lower middle frequencies, the unit includes a 1081 inductor-based +/-18 dB peaking fixed 'Q' equalizer with center frequencies at 220 Hz, 270 Hz, 330 Hz, 390 Hz, 470 Hz, 560 Hz, 680 Hz, 820 Hz, 1000 Hz, and 1200 Hz. For upper middle frequencies, the unit includes a 1081 inductor-based +/-18 dB peaking fixed 'Q' equalizer with center frequencies at 1500 Hz, 1800 Hz, 2200 Hz, 2700 Hz, 3300 Hz, 3900 Hz, 4700 Hz, 5600 Hz, 6800 Hz, and 8200 Hz.

An 18 dB per octave slope inductor-based high pass filter push-button switch allows you to cut below 50 Hz, 80 Hz, or 300 Hz depending on the application. An EQ button allows for the equalizer to be turned on or off and a phase button allows you to flip the signal 180⁰.

• 80dB Class A Microphone preamplifier, HI-LO selectable minimum input impedance, balanced and floating. High gain positions show a higher impedance, ideal for old ribbon mics.
• 10dB Class A Line Amplifier, Bridging input impedance, balanced and floating.
• Class A, single ended, 2N3055 driven high headroom output stage.
• High Frequency: +/-16dB shelving at 12 kHz, Baxandall type.
• Low Frequency: +/-16dB with selectable frequency shelving of 35Hz, 60Hz, 110Hz & 220Hz, Baxandall type.
• 1081 Upper Mid Frequency: +/-18dB peaking, fixed Q , selectable centre frequencies of 1.5Khz, 1.8kHz, 2.2Khz, 2.7kHz, 3.3Khz, 3.9kHz, 4.7kHz, 5.6kHz , 6.8kHz and 8.2Khz, inductor based.
• 1081 Lower Mid Frecuency: +/-18dB peaking, fixed Q, selectable center frecuencies of 220Hz, 270Hz, 330Hz, 390Hz, 470Hz, 560Hz, 680Hz, 820Hz, 1000Hz and 1200Hz, , inductor based
• High Pass Filter: 18dB per octave slope, switchable between 50Hz, 80Hz, 160 Hz & 300Hz, inductor based.

Input Gain Switch - 5dB steps from 20 to 80 in MIC mode. -10 to 20dB in LINE mode
High Shelf - 10, 12, and 16 Khz
Hi Mid Peak Band - 8.2, 6.8, 5.6, 4.7, 3.9, 3.3, 2.7, 2.2, 1.8, 1.5 KHz
Lo Mid Peak Band - 1200, 1000, 820, 680, 560, 470, 360, 330, 270, 220 Hz
Bass Shelf - 220, 110, 60 and 35 Hz
High Pass Filter - 300, 160, 80, 50 Hz
EQL - Switch Equalizer on/off
Phase - Flip Phase 180⁰

Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for lo gain ribbon mics. Input is transformer balanced and floating.
Line input impedance: 10KOhms bridging, transformer balanced and floating.
Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 Ohms.
Maximum output: Greater than +26dBm into 600 Ohms, greater than +32dBu into 10KOhms.
THD: Less than 0.025% at 1Khz, Less than 0.05% at 100Hz.
Frequency response: 20Hz (+0.3dB) to 20Khz (-0.2dB).
Maximum Gain: Slightly greater than 80dB.
Noise: Less than -100dBu.
Power consumption: < 110 mA @24VDC.
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