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Heritage Audio would like to congratulate you on being the lucky owner of our MOTORCITY EQualizer, the world’s first 

reproduction of the “Holy Grail” of classic EQ’s. With its introduction the MOTORCITY EQualizer is the first member of 

our  ´American  Heritage´  line  of  products  as  it´s  a  faithful  reproduction  of  the  actual  EQs  from  Detroit´s  very  own 

MOTOWN Studios. Originally designed by in-house engineers with the idea of producing the greatest possible impact 

on the music they were creating that dominated the charts for over a decade. This was their secret weapon.Until now 

we  have  mainly  focused  on  designing  and  manufacturing  equipment  inspired  by  legendary  vintage  British  console 

modules, using the same hand-wired, transformer-coupled Class A circuitry, but also making sure they are compatible 

with modern day studio environments.Now we wanted some of that American flavor.

After a long gruelling process of meticulously researching and engineering everything to the exact original specifications 

of this iconic 1960s Motown design, we did it.We actually achieved that huge, classic, punchy, warm signature sound 

that  has  blessed  so  many  hit  records  all  without  a  hint  of  harshness  or  distortion.It  wasn´t  easy,  but  it  was  definitely 

worth it. Sadly, there were only about 2 dozens of these EQs produced so we were very lucky to get our hands on 2 

original  Motown  units  owned  by  eight-time  Grammy  winning  producer,  mixdown  artist,  and  innovative  engineering 

genius  Michael  Brauer.With  these  two  we  were  able  to  make  a  spec-to-spec  copy  to  ensure  we  capture  that 

unmistakable sound. The unique passive equalization circuit we incorporated is identical to the original design. And with 

the 10-gauge hand brushed aluminum face plate, historically accurate control layout including custom molded bakelite 

knobs, the MOTORCITY EQualizer certainly looks the part.

 

The MOTORCITY EQualizer is a completely analog, passive EQ design with access to seven frequency points across 

the tonal spectrum.Each frequency has a stepped rotary switch capable of a flat response at ´0´ and a cut or boost of up 

to 8 db in 1 dB stepped increments. As these are stepped rotary switches it´s very easy to make precise settings and 

quick  recalls.  Frequency  points  are  at:  50  Hz,  130  Hz,  320  Hz,  800  Hz,  2000  Hz,  5000  Hz,  and  12,500  Hz.It  also 

features a master gain control (±8 dB), again in 1 dB stepped increments.

Reproducing a vintage design supposes many challenges, but one of the biggest is that it is no longer possible to obtain 

the  original  parts.Therefore,  we  at  Heritage Audio  had  to  have  them  custom  built  from  scratch.  We  only  used  100  % 

period-correct  materials,  values  and  tolerances.  That  means  this  MOTORCITY  EQualizer  is  the  real  deal,  not  just 

something similar, a close copy or a ´new and improved´ version of the original. You might ask why we went through so 

much  trouble  to  recreate  this  all-time  classic…Well,  we  couldn´t  say  it  any  better  than  Michael  Brauer  himself  when 

asked about the EQs - ´It simply got that sound!´.

The  MOTORCITY  EQualizer  really  is  the  genuine  article  made  available  to  the  general  public  for  the  first  time 

ever.Something to be celebrated for sure. For the first time in history you can incorporate this one-of-a-kind equalizer 

into your own setup.Now we can´t guarantee you the massive string of hits that Motown had over six decades ago, but 

we can provide you with a tool that´ll pump up your tracks with the sound that did.

 

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Summary of Contents for MOTORCITY EQualizer

Page 1: ...USER MANUAL August 2022 Rev 1 0 7 BAND PASSIVE EQ AMERICAN HERITAGE...

Page 2: ...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...

Page 3: ...lization circuit we incorporated is identical to the original design And with the 10 gauge hand brushed aluminum face plate historically accurate control layout including custom molded bakelite knobs...

Page 4: ...4 COMPLETE FREQUENCY DESCRIPTIONS 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 50 Hz 130 Hz 320 Hz 800 Hz 2000 Hz 5000 Hz 12500 Hz...

Page 5: ...UENCY DESCRIPTIONS 5 50 Hz Boost Cut Curves 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 50 Hz Usually felt more than heard Adds weight a solid foundation and hits in the chest Can increase Low end rumble...

Page 6: ...6 130 Hz Boost Cut Curves 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 130 Hz Add for warmth deeper sound and more thump Too much makes things boomy too little makes things too thin BASS...

Page 7: ...20 Hz Boost Cut Curves 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 320 Hz Used to add bass presence definition and fullness Too much makes things muffled and muddy too little makes things hollow LOW MIDRA...

Page 8: ...8 800 Hz Boost Cut Curves 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 800 Hz Helps to make things stand out in the mix Too much can produce honk and cause ear fatigue so use carefully MIDRANGE...

Page 9: ...st Cut Curves 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 2 kHz Used to add presence and definition of attacks of drums percussion and add crunch whack Too much will cause ear fatigue so use carefully UPP...

Page 10: ...oost Cut Curves 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 5 kHz Used to add clarity to signals and give them an edge Too much will make things harsh and irritating while reducing will distance the sound...

Page 11: ...11 12 5 kHz Boost Cut 100 1000 10000 Hz dBu 15 10 5 0 5 10 15 12 5 kHz Used to make things sparkle and to add air Too much will accentuate hiss and cause ear fatigue BRILLIANCE...

Page 12: ...2 1 GND Hot Cold MALE XLR FEMALE XLR 1 2 3 4 5 STEPPED ROTARY SWITCH 8 dB at 50 Hz STEPPED ROTARY SWITCH 8 dB at 130 Hz STEPPED ROTARY SWITCH 8 dB at 320 Hz STEPPED ROTARY SWITCH 8 dB at 800 Hz STEPP...

Page 13: ...TOR SPEAKERS THUNDERBOLT COMPUTER LINE INPUT AUDIO INTERFACE D I INPUT PREAMP TT 73 OUTPUT PREAMP TT 73 TRACK INSERT MONITOR SPEAKERS THUNDERBOLT COMPUTER LINE INPUT AUDIO INTERFACE LINE OUTPUT AUDIO...

Page 14: ...SERT MONITOR SPEAKERS THUNDERBOLT COMPUTER AUDIO INTERFACE LEFT RIGHT LINE INPUTS PROCESSED STEREO MIX STEREO MIX DAW LEFT RIGHT LINE OUTPUTS MOTORCITY EQ LEFT RIGHT LINE OUTPUTS MOTORCITY EQ LEFT RIG...

Page 15: ...TER AUDIO INTERFACE SUCCESSOR LEFT RIGHT LINE OUTPUTS LEFT RIGHT LINE INPUTS MASTERED MIX STEREO MIX DAW LEFT RIGHT LINE OUTPUTS MOTORCITY EQ LEFT RIGHT LINE OUTPUTS HA 609A LEFT RIGHT LINE OUTPUTS HA...

Page 16: ...Bu into 600 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 Self noise Less than 100 dBu Power consumption Less than 90 mA...

Page 17: ...on When I activate the equalizer there is just too much of an increase in the signals volume Adjust the OUTPUT GAIN knob to a lower position to compensate for any big equalizer adjustments of frequenc...

Page 18: ...hase 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 bas...

Page 19: ...RECALL SHEETS 19 Session Title Track Connected Equipment Date Instrument Frequency Notes Session Title Track Connected Equipment Date Instrument Frequency Notes...

Page 20: ...www heritageaudio com HERITAGE AUDIO C Alfonso G mez 38 3C 28037 Madrid Spain Tel 34 917 266 189 info heritageaudio com...

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