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EQ1-MK2



The Gambit Series EQ1-DS has now been upgraded to the EQ1-MK2.
Like the old EQ1-DS, the EQ1-MK2 supports 44.1, 48, 88.2 and 96kHz sampling frequencies, always using either 88.2 or 96kHz for internal processing. This is responsible for the well-renowned sound of these high resolution units.
Adding to the high resolution processing, the EQ1-MK2 now features an extended parameter set, increasing the number of possible EQ settings. It also includes a MS matrix coder.
Combined with the flexibility of seven independent bands per channel, the mastering or recording engineer can now twist the transfer curve to his customer's exact specifications.
Parameter resolution
The Q now reaches from a near whole-bandwidth-covering 0.20 to a needle-like 650 in 128 steps, allowing everything from subtle sound colouring to notch filter tone removal. The boost varies in 0.1 dB steps from -39dB (for notching) to +18dB. To compensate for the extremely accurate notch filter type, the frequency resolution has been doubled, now running from 14Hz to 21kHz in 12th octave steps plus including special notch frequencies such as 50 and 60 Hz and their harmonics.
Q for shelving filters
Q can now also be adjusted for the shelving filters. Operation is the same as for the peaking filters: by turning the Q-knob, one can control the slope of the shelving-filter curves. The effect can easily be seen on the frequency response curve.
MS coder/decoder
The EQ1-MK2 includes an MS coder. This enables processing in the MS domain: CH1 becomes the M-signal, CH2 the S-signal.
Encoder and decoder can be switched on seperately, this allows decoding of an MS-recording, with processing either before or after the decoding process.
This is an exciting new feature to the EQ1 and can yield amazing results after some experimentation.

EQ1-MK2 Technical Data:
The version 4.0 software runs on a new SHARC based DSP board which can be exchanged for the old DSP32C based board. The EQ1-DS MK2 features a much higher parameter resolution than the EQ1 or the EQ1-DS. The center frequency, boost/cut and Q each now have a 128 step resolution. The center frequency parameter is stepped in halftone steps and includes 50/60 Hz frequencies with their harmonics for hum suppression. The boost/cut ranges from +18dB down to -39dB with 0.1dB resolution around 0 and the Q factor can be varied from 0.2 to a dazzling 650 for notching out hum frequencies.
Here is a complete list of the parameter values

AES/EBU Input
Sampling Frequencies: 44.1 kHz, 48.0 kHz, 88.2 kHz, 96.0 kHz
Maximum Input Wordlength: 24 Bits
Channel Status Data: Input accepts professional or consumer format.
Channel Status Bits
forwarded to AES/EBU output: see table below
Connector: XLR female
Sampling Frequencies: 44.1 kHz, 48.0 kHz, 88.2 kHz, 96.0 kHz (always the same as the input)
Output Wordlength: 24 Bits
Connector: XLR male

AES/EBU Channel Status Data:
The EQ1 allows to convert the incoming Channel Status Data as follows:
* From Consumer to Professional
* From Professional to Consumer
* Transparent mode, i.e. Channel Status Data is fed forward to the output without any conversion (one exception, see below)
The following tables describe how the Channel Status Data bits are generated in the various conversion modes.
Output selected: Consumer format.
Input: Consumer format.
Output: All bits fed forward (transparent), except for:
Byte 1: Bits 0..6: 0000000 (category code general)
Bit 7: 1 (original)
Input: Professional format.
Output:
Byte 0: Bit 0: 0 (consumer)
Bit 1: 0 (audio)
Bit 2: 1 (copy allowed)
Bits 3,4: Preemphasis according to input
Bit 5: 0 (2 channel mode)
Bits 6,7: 00 (Mode 0)
Byte 1: Bits 0..6: 0000000 (category code general)
Bit 7: 1 (original)
Byte 2: Bits 0,1,2,3: Sampling Frequency according to input
Bits 4,5: 00 (accuaracy grade II)
Bits 6,7: 00
Bytes 3..23: reserved bytes

Output selected: Professional format.
Input: Professional format.
Output: All bits fed forward (transparent), except for:
Byte 2: Bits 0,1,2: 001 (max. sample length= 24bit)
Bits 3,4,5: 101 (24 bit word length)
Bits 6,7: 00

Input: Consumer format.
Output:
Byte 0: Bit 0: 1 (professional)
Bit 1: 0 (audio)
Bits 2,3,4: Preemphasis according to input
Bit 5: 0 (source fs locked)
Bits 6,7: Sampling Frequency according to input
Byte 1: Bits 0,1,2,3: 0001 (two channel mode)
Bits 4,5,6,7: 0000 (no user bit encoding)
Byte 2: Bits 0,1,2: 001 (max. sample length= 24bit)
Bits 3,4,5: 101 (24 bit word length)
Bits 6,7: 00
Bytes 3..12: All bits 0
Byte 23: CRCC byte

Output selected: Transparent.
Input: Any format.
Output: All bits fed forward (transparent), except if EQ not bypassed:
Byte 2: Bits 0,1,2: 001 (max. sample length= 24bit)
Bits 3,4,5: 101 (24 bit word length)
Bits 6,7: 00
Power:
Mains Voltage: 110 / 220 Volts with voltage selector
Fuse rating: 500 mA slow blow
Power Consumption: 40VA max
Number of consecutive over-samples to cause "over" display: 1..16 settable
The filter topology used in the EQ1 is a very low noise filter structure for a state of the art performance.

Parameter Table:
Frequencies (in Hertz):
13.8, 15.4, 17.3, 19.4, 21.8, 24.5, 27.5, 30.9, 34.6, 38.9, 43.7, 49.0, 50.0, 51.9, 55.0, 58.3, 60.0, 61.7, 65.4, 69.3, 73.4, 77.8, 82.4, 87.3, 92.5, 98.0, 100, 104, 110, 117, 120, 123, 131, 139, 147, 150, 156, 165, 175, 180, 185, 196, 200, 208, 220, 233, 240, 247, 250, 262, 277, 294, 300, 311, 330, 349, 360, 370, 392, 415, 440, 466, 494, 523, 554, 587, 622, 659, 698, 740, 784, 831, 880, 932, 988, 1047, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1976, 2093, 2217, 2349, 2489, 2637, 2794, 2960, 3136, 3322, 3520, 3729, 3951, 4186, 4435, 4699, 4978, 5274, 5588, 5920, 6272, 6645, 7040, 7459, 7902, 8372, 8870, 9397, 9956, 10548, 11175, 11840, 12544, 13290, 14080, 14917, 15804, 16744, 17740, 18795, 19912, 21096.

Boost/Cuts, applicable to shelving and peaking filters:
All numbers in dB:
-39.0, -36.0, -33.0, -30.0, -27.0, -24.0, -21.0, -18.0, -17.0, -16.0, -15.0, -14.0, -13.0, -12.0, -11.5, -11.0, -10.5, -10.0, -9.5, -9.0, -8.5, -8.0, -7.5, -7.0, -6.5, -6.0, -5.5, -5.0, -4.8, -4.5, -4.3, -4.0, -3.8, -3.5, -3.3, -3.0, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.2, -2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, -1.2, -1.1, -1.0, -0.9, -0.8, -0.7, -0.6, -0.5, -0.4, -0.3, -0.2, -0.1, 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9. 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.3, 3.5, 3.8, 4.0, 4.3, 4.5, 4.8, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0, 17.0, 18.0.

Q, applicable to peaking filters:
0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, 1.50, 1.55, 1.60, 1.65, 1.70, 1.75, 1.80, 1.85, 1.90, 1.95, 2.00, 2.10, 2.20, 2.30, 2.40, 2.50, 2.60, 2.70, 2.80, 2.90, 3.00, 3.10, 3.20, 3.30, 3.40, 3.50, 3.60, 3.70, 3.80, 3.90, 4.00, 4.10, 4.20, 4.30, 4.40, 4.50, 4.60, 4.70, 4.80, 4.90, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 22.0, 24.0, 26.0, 28.0, 30.0, 35.0, 40.0, 45.0, 50.0, 55.0, 60.0, 65.0, 70.0, 75.0, 80.0, 85.0, 90.0, 95.0, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 220, 240, 260, 280, 300, 350, 400, 450, 500, 550, 600, 650

Shape, applicable to shelving filters:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 ,41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128
Slope, applicable to cut filters:
0dB/octave, 6dB/ octave, 12dB/ octave

Overall Gain:
All numbers in dB:
-8 , -92.0, -89.0, -86.0, -83.0, -80.0, -77.0, -74.0, -71.0, -68.0, -65.0, -62.0, -59.0, -56.0, -53.0, -50.0, -48.0, -46.0, -44.0, -42.0, -40.0, -39.0, -38.0, -37.0, -36.0, -35.0, -34.0, -33.0, -32.0, -30.0, -29.5, -29.0, -28.5, -28.0, -27.5, -27.0, -26.5, -26.0, -25.5, -25.0, -24.5, -24.0, -23.5, -23.0, -22.5, -22.0, -21.5, -21.0, -20.5, -20.0, -19.5, -19.0, -18.5, -18.0, -17.5, -17.0, -16.5, -16.0, -15.5, -15.0, -14.5, -14.0, -13.5, -13.0, -12.5, -12.0, -11.5, -11.0, -10.5, -10.0, -9.5, -9.0, -8.5, -8.0, -7.5, -7.0, -6.5, -6.0, -5.8, -5.6, -5.4, -5.2, -5.0, -4.8, -4.6, -4.4, -4.2, -4.0, -3.8, -3.6, -3.4, -3.2, -3.0, -2.8, -2.6, -2.4, -2.2, -2.0, -1.8, -1.6, -1.4, -1.2, -1.0, -0.8, -0.6, -0.4, -0.2, 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0
 


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