Heritage Audio HA-73 EQX2 Dual Channel Class A Microphone Preamp User Manual

: June 9, 2024
: Heritage Audio

Table of Contents

INTRODUCTION
Box Items
DESCRIPTION
GETTING STARTED
APPLICATIONS
SPECIFICATIONS
SIGNAL FLOW
TROUBLE SHOOTING
WARRANTY STATEMENT
REGISTRATION
RECALL SHEETS
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Heritage Audio HA-73 EQX2 Dual Channel Class A Microphone Preamp User Manual

INTRODUCTION

Thank you for choosing the Elite Series HA-73EQX2. Heritage Audio is dedicated to bringing you ´the sound of yesterday for tomorrow´. We specialize in capturing that unique, enticing sound that everybody has fallen in love with.
For years engineers, producers and musicians have been yearning for that classic vibe. Usually the only option is to search for old, used original equipment that is almost always in a questionable state of operation. This brings with it a whole lot of other issues, making the experience less than desirable. Not to mention the very high prices asked for this equipment, which makes them virtually unobtainable for the great majority. Now it´s possible to obtain that same sound with a brand new piece that will give you all the problem-free, heavy-duty use you´ll need for years of music making history

Peter Rodriguez

CEO
Heritage Audio – Madrid, Spain

© 2022 Heritage Audio S.L. is the sole owner of the copyright of all information and drawings contained in this manual which are not to be copied or reproduced by any means or disclosed in part or whole to any third party without written permission.
Heritage Audio reserves the right to alter specifications without notice. The information in this manual has been carefully checked and is believed to be accurate at the time of publication. However, no responsibility is taken by us for inaccuracies, errors or omissions nor any liability assumed for any loss or damage resulting either directly or indirectly from use of the information contained within it.

Box Items

DESCRIPTION

The Heritage Audio HA-73 EQX2 is now twice as awesome with its brand-spankin’ new dual channel format! After the enormous success of its single channel predecessor, we are proud to welcome the new member of the Elite Series family, the HA-73 EQX2 Elite.

Equipped with two mic pre/equalizers in the same rack unit, our double EQ will bring twice the mojo for less than twicethe money to your recording studio, increasing your processing capabilities with the premium audio excellence of our Elite Series. The HA-73 EQX2 Elite is made to the same specifications as the acclaimed 73 JR II, 73 EQ JR and DMA 73 Heritage Audio models at a price never heard before.

Leveraging the expertise and reputation obtained with its popular hand wired, extremely time-consuming hand soldered series, Heritage Audio is able to offer a zero compromise, high quality yet very affordable alternative to the growingentry-level brands.

A combination of mass production, lean manufacturing and modern construction techniques, minimizes hand labor and therefore its high associated costs when manufacturing takes place in Western Europe. By passing the savings straight into the end users´ pockets, Heritage Audio releases the most affordable outboard preamps and equalizers in its class up to date.

Key components to obtain a true vintage sound are indeed maintained, like the industry standard Carnhill transformers, hand wound in St Ives, England.

Manufactured in the same Spanish facilities as the rest of the HA line of products, the HA-73 EQX2 Elite rack mountable mic preamp equalizer presents the complete classic recording channel that, for generations, has been regarded for its rich, musical qualities and its ability to dramatically improve the sound of almost any source.

No 73 equalizer will present the correct equalization curves without high quality capacitors and, most importantly, correct “Vinkor” type pot core inductors. More than often this type of products has these expensive inductors replaced with generic ferrite core ones or, even worst, the mid band dual inductor replaced with a single one. Never in Heritage Audio products!!, as the impact of replacing these to the eq curves is dramatic, leading to incorrect curve´s shapes and high frequency phase distortion which in no way honor the design.

The HA-73 EQX2 Elite employs WIMA 5% capacitors in the EQ section as well as 3 correct vintage type “Vinkor“pot core inductors so the eq curves are virtually undistinguishable from the handmade equalizers in the HA line. Customers can expect the same sonic quality and feel they have come to appreciate from Heritage Audio.

The HA-73 EQX2’s preamp section features gain, output trim, -20 db pad, polarity reverse, a high pass filter, and +48 V phantom power. The HA-73 EQX2’s EQ section features a high shelving EQ, midrange EQ, low shelving EQ, a variable high pass filter, and EQ Bypass. The HA-73 EQX2 comes housed in a rugged 1RU British steel and aluminum chassis and utilizes an external power supply for low noise operation.

Our Elite Series pledge to always deliver the best value for your investment, with zero compromises, Western European made high-quality gear to enhance your musical experience.

DESCRIPTION

GETTING STARTED

FRONT

GETTING STARTED

D.I. INPUT
High Impedance Class A JFET
PHANTOM POWER SWITCH
Activates 48 V
MIC PAD BUTTON
20 dB Reduction Ahead of Input Transformer
INPUT GAIN SWITCH
5 dB Steps From 30 to 80
HI SHELF at 12kHz
Boost or Cut up to 15 dB at 12 kHz
MID BAND FREQUENCIES
Selects frequencies from: 0.36, 0.7, 1.6, 3.2, 4.8 and 7.2 kHz.
An OFF position is also provided to remove the band from the signal path
LOW SHELF FREQUENCIES
Selects frequency for the Low Shelf: 35, 60, 110, 220 Hz
HIGH PASS FILTER
18 dB/Octave 3-pole Filter at selectable frequencies: 50, 80, 160, and 300 Hz. An OFF position is also provided to remove the filter from the signal path
OUTPUT ATTENUATOR
Attenuates from 0 to Infinity
EQL
Turns Equalizer ON and OFF
LINE BUTTON
Switches from MIC/D.I. to LINE input
MIC INPUT IMPEDANCE
(LOZ) 1200 Ω or 300 Ω when pressed
MID BAND BOOST/CUT
±15 dB of Boost or Cut
LOW SHELF BOOST/CUT
±15 dB of Boost or Cut
PHASE BUTTON
Flips phase 180º
POWER
Activates unit

REAR

GETTING STARTED

POWER INPUT
To Be Connected to the HA PSU04 Power Supply
LINE OUTPUT
Male XLR Connector
LINE INPUT
Female XLR Connector
MIC INPUT
Female XLR Connector

All XLRs are:

Pin 1: GND
Pin 2: Hot
Pin 3: Cold

D.I. Jack:

Tip: Signal
Sleeve: Ground

APPLICATIONS

MIC

APPLICATIONS

D.I.
APPLICATIONS

LINE

SPECIFICATIONS

Microphone input impedance: High=1200 Ω minimum; Low= 300 Ω minimum. Higher gain positions gradually have greater impedances, optimum for low gain ribbon mics. Input is transformer\ balanced and floating.
Line input impedance: 10 kΩ bridging, transformer balanced and floating.
Output impedance: Less than 75 Ω, transformer balanced and floating, to drive a load of 600 Ω.
D.I. input impedance: Greater than 2 MΩ, unbalanced.
Maximum output: Greater than +26,5 dBu into 600 Ω (internally terminated).
THD: Less than 0,025 % at 1 kHz, Less than 0,05 % at 100 Hz.
Frequency response: 20 Hz (+0,3 dB) to 20 kHz (-0,2 dB).
Maximum Gain: Slightly greater than 80 dB.
Equivalent Input Noise: Less than -125 dBu.
Output stage noise: Less than -100 dBu.
Power consumption: Less than 260 mA @ 48 V DC.
Dimensions (W x H x L): 482 mm x 88 mm (2 Rack units) x 184 mm.

SIGNAL FLOW

TROUBLE SHOOTING

|
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PROBLEMS| SOLUTIONS
There doesn´t appear to be any signal at all arriving at the back XLR.| Make sure the GAIN knob is not in the ´Off´ position.
There still doesn´t appear to be any signal at all arriving at the back XLR.| Check to see if a jack cable has been left plugged into the front panel D.I.
Even at the lowest position on the GAIN knob I still have too much gain.| When this happens you should activate the PAD button. This will reduce the input by 20 dB ahead of the input transformer.
Condenser microphones don´t seem to work with HA-73 EQX2.| Make sure the red +48 V button is pressed in to activate the phantom power sent to the microphone.
There doesn´t seem to be any output at all from the unit.| Check to see if the OUTPUT knob is fully turned down as this will attenuate the signal completely
Sending a signal to the unit from a DAW overloads it terrible.| It is necessary to press the LINE button when sending it a line level source.
If not, it is expecting a Microphone signal with a very different impedance.
No matter how I adjust the EQ I there doesn´t seem to be any tonal change.| Make sure you have activated the EQ with its corresponding button.

For any further doubts or questions please get in contact with us at: support@heritageaudio.com

WARRANTY STATEMENT

LIMITED 2 YEAR WARRANTY

Heritage Audio HA-73 EQX2 is warranted by Heritage Audio SL to be free from defects in materials and workmanshipfor the period of 2 years to the original purchaser. In the event of such defects, the product will be repaired without charge or, at our option, replaced with a new one if delivered to Heritage Audio prepaid, together with a copy of the sales slip or other proof of purchase date. The warranty excludes problems due to normal wear, abuse, shipping damage or failure to use the product in accordance with the specifications.

Heritage Audio shall not be liable for damages based upon inconvenience, loss of use of the product, loss of time, interrupted operation or commercial loss or any other damages, whether incidental, consequential or otherwise.

This warranty is not transferable.

Heritage Audio and the Heritage Audio “H” logos are registered Trademarks ownedand/or licensed by Heritage Audio
WARRANTY STATEMENT