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Chameleon Labs 500 Series 581 Class AB Microphone Preamp
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      Chameleon Labs 500 Series 581 Class AB Microphone Preamp (107914673)
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Incredible, warm sound from this well priced 500 series microphone preamp.

The Chameleon Labs Model 581 is a discrete Class AB 500 series microphone preamplifier module, with an extraordinary sonic signature at an amazing price point. Its clarity and incredibly solid low end is reminiscent of renowned classic designs. Rich, warm, and musical, the 581 provides detailed results by employing classic circuit design, polystyrene capacitors, hand selected components and custom wound transformers, Chameleon Labs ensures that the Model 581 will exhibit classic audio sound. It is also designed to comply with any 500 series powered chassis approved by the API VPR Alliance

Chameleon Labs 500 Series 581 Class AB Microphone Preamp Features:

  • Discrete Class AB Circuit
    API 500 series compatible card
    Powered by CPS-501 Powered Chassis or any 500 series compatible power supply
    Fully balanced transformer mic input, which can be upgraded to a vintage style Carnhill unit
    Transformer balanced output
    300 Ohms or 1.2K Ohms mic input selector
    48VDC phantom power selector
    Hi-Z Direct Input for instruments on the front panel
    Output level control functions as a fader when going straight to D.A.W. or tape
    LED illuminated push buttons for visual confirmation
    LED Metering (Power, Signal, +4dB, Peak)


Chameleon Labs 500 Series 581 Class AB Microphone Preamp Specifications:

  • Microphone Input Impedance: 300O or 1,200O
    Microphone Amplifier Gain: +25 dB to +80 dB in 5 dB steps
    Output Impedance: 100O Noise: -115.5 dB
    Maximum Output: +26 dB into 600O
    Frequency Response: 20Hz - 20 kHz +/- 1 dB.
    Weight: 2.8lb.
    Dimensions (WxHxD): 1.5" x 5.25"
    Depth to Rear of Mounting Surface: 5.938" =/- 0.02"
    Power Requirements: +/- 16 V @ = 130 ma, +48 V @ 5 ma
    One-year warranty


Product Reviews
(Based on 1 reviews)
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  • Chameleon Labs 581

    As reviewed by Justin on 3/11/2015

    After a long wait, I received my revised blackface Chameleon Labs 581 and put it through its paces. I was eager to compare it to other Neve inspired pieces in my studio, and see how a mix comes together using just the 581. My most direct comparison was to the Heritage Audio 73JR, which quickly won me over and has been my go to preamp. I noticed right away that the 73JR has a more grinding and open saturation, with extended bottom end, and a very pronounced upper midrange saturation. When the 73JR is pushed, it gets beefy, and also has more upper midrange to it. The Class A/B 581 doesn't share the extended low end content of it's Neve inspired Class A competition, the 581 is tighter and handles the bottom end transients with excellent clarity. The upper mids aren't as in your face, but more reserved, yet still very defined. The more you push the 581, the more it's silky texture is brought to life, and it shows its rich harmonics without losing clarity; slightly increasing the bottom end, and bringing an edge to the highs, yet still retaining a tight and focused sound. Switching back to the 73JR, you get a more open feel, and the sounds are bigger, but not better - just different. In my experience, the 73JR can definitely be too much of a good thing, and lead to the signature Neve cloudiness in the low frequency transients when used on every track, but the 581 will provide detail where the 73JR might contribute to said cloudiness. Overall, they compliment each other very very well. I can see myself using the 581 more and more, specially on high track counts.

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