तकनीकी स्पेसिफिकेशन और आयाम

माइक्रोफ़ोन preamplifier

बैलेंस्ड DB25 एनालॉग आउटपुट्स पर measured।

स्पेसिफिकेशन	मान
Microphone gain	0–70 dB
Switchable pad	−15 dB, all channels
Line gain	−10 to 60 dB; −25 to 45 dB with pad
Phantom power	48 V ±4 V at 10 mA per channel
Microphone EIN	<−127.0 dBu
CMRR	>80 dB from 100 Hz to 2 kHz
Maximum input level	+20 dBu; +35 dBu with pad
Microphone input impedance	>2 kΩ balanced; approximately 2.2 kΩ
Line input impedance	>8 kΩ balanced; approximately 8.6 kΩ
Frequency response	±0.5 dB, 10 Hz–100 kHz at minimum gain
Crosstalk	<−90 dBu, 10 Hz–10 kHz
THD+N at 0 dBu, 1 kHz	<0.003% (−90.5 dBu), mostly third harmonic
SNR	>90 dB at minimum gain
XLR wiring	Pin 2 hot, pin 3 cold, pin 1 shield
1/4-inch TRS wiring	Tip hot, ring cold, sleeve shield

Discrete JFET D.I.

माइक्रोफ़ोन-preamplifier circuitry के माध्यम से measured।

स्पेसिफिकेशन	मान
D.I. gain	0 dB unity gain into the 0–70 dB preamp range
Maximum input level	+17 dBu
Input impedance	1 MΩ unbalanced
Frequency response	±0.5 dB, 10 Hz–50 kHz
THD+N at 0 dBu, 1 kHz	<0.01% (−80 dBu), mostly second and third harmonic
SNR	>85 dB at minimum gain
1/4-inch TS wiring	Tip hot, sleeve shield

बैलेंस्ड एनालॉग लाइन आउटपुट्स

स्पेसिफिकेशन	मान
Output circuit	Ground-sensing compensation
Maximum output level	+22 dBu
Output impedance	<200 Ω ground-sensing; <100 Ω unbalanced
Connector	8-channel, 25-pin Tascam-format DB25

A-D converter

माइक्रोफ़ोन preamplifiers के बिना AES-17 के अनुसार measured।

स्पेसिफिकेशन	मान
Chipset	Burr-Brown PCM4204, 24-bit PCM
Digital reference	Selectable: 0 dBFS = +18 dBu or +12 dBu
Frequency response	±0.1 dB, 20 Hz to Fs/2 (Nyquist)
Crosstalk	<−110 dBFS at 1 kHz; <−90 dBFS at 10 kHz
THD+N at −1 dBFS, 1 kHz	0.0015% (−96.5 dB)
THD+N at −6 dBFS, 1 kHz	0.0009% (−101 dB)
Dynamic range	113.5 dB unweighted; 116.0 dB A-weighted
Peak LED line-up	−2 dBFS, moves with reference level
Signal LED line-up	−38 dBFS, moves with reference level

Digital आउटपुट और क्लॉक

स्पेसिफिकेशन	मान
ADAT SMUX	8 channels, 44.1–96 kHz
Clock	Internal crystal or external सोर्स
Word-clock input	75 Ω BNC with switchable 75 Ω termination

HMX MOSFET saturator

स्पेसिफिकेशन	मान
THD+N at 0 dBu, minimum drive, 1 kHz	0.35%, second and third harmonic only
THD+N at 0 dBu, maximum drive, 1 kHz	2.73%, dominated by second to fourth harmonics
Noise at minimum drive	−73 dBu, सोर्स manual में इसे “like an old tube amp” कहा गया है
Frequency response effect	Low-frequency emphasis from 30–150 Hz
Waveshaping	Asymmetrical, tube-like soft clipping

HMX pre-emphasis और de-emphasis filtering तथा तीन cascaded Class-A MOSFET amplifiers का उपयोग करता है। Drive बदलने पर इसका आउटपुट लेवल constant रखा जाता है। सोर्स मैनुअल में note किया गया है कि added noise DAW के भीतर एनालॉग dither की तरह काम कर सकता है।

IRON transformer saturator

स्पेसिफिकेशन	मान
THD+N at 0 dBu, minimum drive, 1 kHz	0.11%, mostly second and third harmonic
THD+N at 0 dBu, maximum drive, 1 kHz	0.006%; सोर्स manual में note है कि driver load बदलने पर यह clean up होता है
Low-frequency THD+N below 300 Hz	Complex variation with level and frequency; distorts bass content
Noise at minimum drive	−84 dBu, सोर्स manual में इसे “like a 2-inch tape machine” कहा गया है
Frequency response effect	Rising air boost/resonance from 4–15 kHz
Waveshaping	Symmetrical magnetic-loop saturation, transient shaping and phase shift

IRON magnetic-core saturation को अपने drive और recovery amplifiers की थोड़ी asymmetrical saturation के साथ combine करता है। 1:1 transformer की secondary loading high-frequency response को shape करती है।

पावर supply

स्पेसिफिकेशन	मान
Design	Low-noise, shielded linear PSU with custom transformers; fanless operation
Maximum consumption	35 W
Internal DC rails	±15 V, +48 V, +32 V and +9 V
Selectable mains voltage	100, 120, 220 or 230 V AC
Fuse	T200mA for 220–250 V or T315mA for 90–120 V; time-delay slow-blow type

फिजिकल स्पेसिफिकेशन

स्पेसिफिकेशन	मान
Rack size	1RU
Width	482 mm
Maximum depth	286.5 mm
Chassis depth shown in drawing	250.4 mm
Height	44 mm; drawing also marks 44.04 mm
Weight	4.5 kg