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Z-Q6 and Z-CL6
Six-channel mastering processors


Z-Systems z-Q6/z-CL6 surround-sound mastering gear for the ultimate in surround mastering. Comprised of the z-Q6 six-channel digital mastering equalizer and the z-CL6 six-channel digital dynamics processor, the z-Q6/z-CL6 suite incorporates Z-Systems's proprietary digital signal processing algorithms, intuitive user interfaces, and the highest-quality parts. Both units feature six channels of 24-bit /96 kHz digital processing and the ability to handle multiple simultaneous sample rates and wordwidths within each channel group.

The z-Q6 offers four bell-shaped filters and two shelving filters per channel, as well as individual channel volume offsets and a master volume control.

The z-CL6 offers six channels of compression/limiting with variable ratio, attack, release, threshold, and make-up gains per channel. In addition, the z-CL6 features a sophisticated linking mechanism whereby the different channel groups can be custom-tailored to trigger and compress in unison or separately.

Both the z-Q6 and the z-CL6 feature POW-r wordlength reduction and MIDI automation for snapshot automation. The z-Q6/z-CL6 are available individually or together as a suite.


Quotes From Satisfied Users

“I called Glenn Z and accused him of hiding A/D and D/A converters inside, along with six channels of Pultec Tube EQ.... The z-Q6 is one of those exceptional pieces of equipment that has a quiet elegance about it... It only does one thing and it does it to virtual perfection."
Glenn Meadows, Audio Media Magazine

“In virtually all settings, I found the [zCL6] to be incredibly smooth and analog sounding at even the most extreme parameter settings."
Bobby Owsinski, Surround Professional Magazine

"This is a really excellent-sounding unit. It sounds at least as good as the best analog equalizer that I have in my signal path."
Eddy Schreyer, Oasis Mastering

"The z-Q6/z-CL6 sound great and the functionality is just right. They're the ideal solution for surround mastering."
Bob Ludwig, Gateway Mastering

"The Z-Systems surround units are being used to master many of the initial Sony Music front line 5.1-channel DVD audio releases. We are very happy with their performance."
Vlado Meller, Sony Music Entertainment -- New York

Product Specifications: z-CL6
Inputs: 3 AES/EBU (transformer-isolated, 110-ohm terminated)
Outputs: 3 AES/EBU (transformer-isolated, 110-ohm terminated)
Input/output precision: up to 24-bits
Sample rates supported: 44.1 kHz, 48.0 kHz, 88.2 kHz, 96 kHz
Compression ratios: 1.1:1 to 8.0:1
Limiter ratio: 100:1
Threshold: from -95.0 dBFS to 0.00 dBFS
Attack time: from 5.0 us to 950 ms.
Release time: from 5.0 us to 950 ms.
Highpass filters in detector chains: -12 dB/octave slope w/corner frequency from 10 Hz to 990 Hz
Dynamic range: better than 130 dB
THD + Noise: less than -130 dB
Number of presets: 50
Power supply: 110/220VAC, 50/60Hz
Product Specifications (z-Q6)
Inputs: 3 AES/EBU (transformer-isolated, 110-ohm terminated)
Outputs: 3 AES/EBU (transformer-isolated, 110-ohm terminated)
Input/output precision: up to 24-bits
Sample rates supported: 44.1 kHz, 48.0 kHz, 88.2 kHz, 96 kHz
Gain control: from -95 dB to +12 dB
Gain resolution: 0.1 dB increments from +12 dB to -12 dB, 1 dB increments from -12 dB to -20 dB, 2 dB increments from -20 dB to -50 dB, 3 dB increments from -50 dB to -70 dB, 5 dB increments from -70 dB to -95 dB
Filter types: 4 parametric, 2 shelving x 6 channels
Center frequency resolution: 1/6-th octave ISO from 28 Hz to 20 kHz
Filter gain/cut: from -95 dB to +12.0 dB
Filter bandwidths: 24 steps from Q = 0.4 to Q = 8.0 (nominal)
Shelf filter slopes: 6 dB/octave
Dither types: 24-bit, 20-bit and 16-bit proprietary floating-point techniques
Noise shaping types: POW-r curves #2 and #3
Digital filter architecture: proprietary minimum roundoff-noise structure
Dynamic range: better than 144 dB
THD+N: better than -135 dB
Number of presets: 50
Power supply: 110/220VAC, 50/60Hz

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