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API 512V 500 Series Discrete Microphone Preamp

500 Series Discrete Mic/Line/Instrument Preamp with Output Level Control and 3:1 Output Transformer Tap Switch
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API 512V 500 Series Discrete Microphone Preamp
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This article was Written By

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Put a Legendary Preamp in Your Rack

The API 512v 500 Series mic pre gives you all the features - and legendary sound - of the 512c, with a couple of valuable additions. First, API fitted the 512v with an output level control just below the input gain knob. This gives you more control over level-matching, which you'll especially appreciate if you work in a DAW-based studio. It also streamlines your setup, eliminating the need for 3rd-party attenuators. The second enhancement is the addition of a 3:1 output transformer tap switch, again, giving you more control over your gainstaging. Want more vintage iron in your sound? Tap the 3:1 button and you'll immediately lower your output level, so you can hit the transformer harder on the input side. The 512v also features a new combo input jack. In all other respects, the 512v is identical to the 512c - every inch a classic. At Sweetwater, that's what we expect from API.

API 512v Mic/Line/Instrument Preamp at a Glance:
  • Modular console-grade preamplification
  • API 500 Series: unrivaled utility, value, and sound
  • The API heritage
Modular console-grade preamplification

Sporting API's 500 Series modular format, the API 512v boasts a lofty pedigree. In the 1970s, API's modular consoles defined the punchy, vibrant sound of American radio hits. And every product the company currently makes is brimming with that same inimitable sonic character. With the 512v, you get an API console-grade microphone preamplifier with traditional discrete circuitry, in a design that's flexible, expandable, and portable. If you're looking for classic preamp character, then you've found it: the API 512v.

API 500 Series: unrivaled utility, value, and sound

The beauty of the entire API 500 Series is its long-term flexibility and lasting value - especially when you consider that needs change over time. With a range of mounting frame options, the API 512v will be a valuable asset to your ever-changing studio rigs. It's also ruggedly designed with sound you just won't outgrow - crafted to be your sonic partner for year after year after year.

The API heritage

In 1968, Automated Processes Inc. began building quality consoles for broadcast applications. Soon, the company's products found favor with recording studios, and a string of industry-leading advancements (including computerized console automation, the first VCA, and more) followed. API produced the 2520 amplifier, one of the most famous op-amps in the recording industry, and their consoles and products found homes in such iconic studio facilities as Ocean Way, the Record Plant, the Hit Factory, and Sunset Sound, among others. In fact, there are over 700 classic API consoles around the globe - many of which are still in use. And the company certainly isn't resting on its laurels; today's API products give you the same unbeatable combination of utility, innovation, and great sound.

API 512v Mic/Line/Instrument Preamp Features:
  • 500 Series discrete mic preamp with 65dB of gain
  • Features variable-output level control
  • 3:1 output transformer tap switch:
    • Produces lower output level
    • Lets you drive transformer harder
  • Front- and rear-panel Mic Input access
  • Line/Instrument Pre with 45dB of gain
  • Front-panel combo XLR + 1/4" Line Input
  • LED VU meter indicates Gain Level
  • 20dB pad switch (applies to mic/line/instrument)
  • Switchable 48-volt Phantom Power
  • API's traditional discrete circuitry
  • Incorporates classic 2520 Op Amp
  • Comes with API's Five Year Warranty
The API 512v delivers that legendary console sound!

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Tech Specs

  • Preamp Type: Solid State API 500 series
  • Number of Channels: 1
  • Phantom Power: Yes
  • Pads: -20dB
  • Polarity Switch: Yes
  • Analog Inputs: 1 x XLR-1/4" combo (mic/line/instrument)
  • Features: Output Transformer select (3:1 tap)
  • Manufacturer Part Number: 512V

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Customer Reviews

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Rated 5/5

Killer API sound. Sick!

This is one of my favorite 500 pre's. 90% of the time sits are my Bass tracking pre but sometimes I use it on vocals. The sound is killer. drop in the 3:1 nickel and rock it.
Rated 5/5

THE BEST! If you have a 500 Series Rack. It's a Must!

This Module sounds incredible. I brought mines in 2021, and it has changed my mixes in ways I could not imagine. This morning I was hearing some of my previous mixes [Comparing & Contrasting] and I just had to leave a review... I understand that many utilize this piece of gear mainly for drums/Guitars... But I ran my whole Mix thru it and it just Sounds Beautiful... Yes! Even the vocals. I am currently utilizing two of these as [Line Inputs L/R] coming out of a Dangerous Audio 2BUS 16 channel "Summing" Box. What I noticed is the instant Clarity and Mid-Range Presence. I also noticed that the details were pristine, clear, and slightly wider with more definition.. Trust me, You will notice any errors within your mix. One thing that stood out is that they are "Punchy" and the Dynamics are retained. There is NO slight compression at all... within any of the Frequencies. These Modules contain that Tonal character that gives 'API' their Name. The coloration Sounds Nice. This specific Module [512 V Version] contains input and output knobs, which is something that the previous version [API 512 C Version] did not have. What this allows you to do, is Tone shape the Classic API Sound by pushing it harder and avoiding distortion by lowering one of the knobs. The unit also contains an option 3:1 button in case you want to add further aggression like Smashing Drums. Another thing that stood out and lead me to place them after my Summing and Before my A/D's, is the fact that you can push these Babies LOUD without distorting your Sound. This is something I couldn't do with other 500 series units that I utilized in the past. If you want an example of how these sound... Tune in to Classics like [Purple Haze or All along the Watch Tower by Jimmy Hendrix]... Of Course with all of the modern Clarity that your current DAW provides. I finally understand why API is top of its class and within the same Range as Neve and SSL. Always Remember certain Modules are Transparent while certain Colors sound slightly... This one colors API Style...
Music background: Music Engineer/Composer
Rated 5/5

API 512v

I finally obtained 4 of these for my studio. They definitely have that API weight and sound. I actually use them as signal processors for in the box mixing, so the output gain control is a plus for line input signals. So far they work on anything but I like these the most on drums!
Music background: Composer/Producer/DJ
Rated 5/5

U Da 1

Absolutely love this preamp. Easily achieves the DI guitar and bass tones I'm after. Recently migrated to the API 512v for the sound and 500 series form factor from an Aurora Audio GTQ2. The GTQ2 is a phenomenal preamp in its own right, but I've preferred the 512v in most applications. Excited to use this ol' boi for a long time to come.
Music background: Studio Musician, Recording Artist
Rated 5/5

API pre amp vs UA plugns

I use Universal Audio(UA)for my interface. UA makes amazing pieces of equipment. You can not go wrong with the Universal Audio gear. I have analog and digital gear from UA. I even have the API universal Audio plugins.

OK, comparing the 512V preamp to the plugin, they are just not the same. The 500 series 512V is much richer, more clear, and has more of the tonal qualities you get with an analog API mixing board. The UA plugin is quick and easy and accurate. The plugin has a very good sound and is adjustable in many ways. You will not be disappointed with the plugins. Having said that, I always use the 512V because to me it is richer and has a better tone.

I use the 512 V on most all vocals and acoustic guitars. Coupled with a 525 API compressor you will get fantastic results. I can not say enough about it.

If you are using UA or waves or any other plugins you may be missing the true feel of API analog tone. If you have the cash buy it. I just works.
Music background: Singer/songwriter, music production
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