EQ1 seven-band equalizer - Störung | Sound Art & Professional Audio Störung | Sound Art & Professional Audio

EQ1 seven-band equalizer

Weiss EQ1 – the reference when it comes to digital mastering EQs. Available in four different models, including linear phase and dynamic versions.
The EQ1 is a two channel digital equalizer with seven parametric bands. It has digital inputs/outputs exclusively. The EQ1 is available in four different configurations. All of them work at up to 24 Bit/96 kHz. The basic model is the EQ1-MK2, the linear phase model is the EQ1-LP, the dynamic model the EQ1-DYN. The EQ1-DYN-LP incorporates both LP and DYN versions in one unit. The mode of operation (LP or DYN) can be chosen after power-up. All models are user-upgradeable to any other version.

«The new upgrades to the DS1 and EQ1-LP are remarkable. I think that the double-sampling EQ1-LP is the finest sounding equalizer that has ever been produced, whether analog or digital.»
– Alan Silverman, Arf! Digital, USA



12.157,62

Price (21% VAT included)




MAIN FEATURES

Basic EQ1 functions
The basic features are common to all four models, namely the seven identical parametric bands, i.e. all seven bands cover the entire audio frequency range. Each band has Boost/Cut, Frequency and Q/Slope knobs and operates in any of the following modes: High shelving, low shelving, peaking, high cut, low cut, bypass.

Controls, display
There are seven times three knobs in order to have “one knob per parameter” operation. The knobs are touch sensitive to switch the LCD to display the parameters of the touched band. The LCD shows the overall frequency response, the detailed parameter values and various status information.

Snapshots, MIDI, metering
Other basic features are an A/B compare memory, a 128 position snapshot bank with two additional banks for back-up (can also be dumped/recovered via MIDI), a peak meter with over indicators, MIDI control for each parameter, an overall bypass switch and an overall gain control, a channel ganging switch.

Signal processing, connectivity
The internal processing is done at 88.2 or 96 kHz in a 40 Bit floating-point format. A very low noise filter architecture optimized for audio is used. The digital input/output are in AES/EBU format on XLR connectors. The AES/EBU output can be POW-R dithered to 16, 20 or 24 Bits.

M/S mode
The EQ1 can be switched to M/S mode which is especially useful for the dynamic model of the EQ1. Also see the article: “Stereo Shuffling: New Approach – Old Technique” by Michael Gerzon. Other specialties are variable slope shelving filters and very high Q (up to 650) peaking filters for notching out offending frequencies.

APPLICATIONS

The EQ1 can be inserted into any digital audio chain with sampling rates between 44.1 and 96 kHz. The synchronization is done via the AES/EBU input signal.

EQ1-MK2
The EQ1-MK2 is the basic model with minimum phase type filters.

EQ1-LP, the EQ1-MK2 with linear phase response
The EQ1-LP has the same parameter set and features as the EQ1-MK2. In addition it can be switched between minimum and linear phase behavior. Linear phase means that the delay introduced by processing is constant across the whole spectrum, unconstrained by the EQ settings. The sound, or character, of an equalizer has been said to be influenced by phase response as for example John Watkinson mentioned in Studio Sound magazine 9/97: “… much of the audible difference between EQs comes down to the phase response.” The EQ1-LP is therefore the ideal tool for corrective amplitude adjustment, without the unwanted phase distortion added by standard equalizers.

EQ1-DYN, the EQ1-MK2 with four dynamic bands
The EQ1-DYN features four freely adjustable dynamic bands, and additionally three linear bands per channel. Setting up the dynamic bands is as easy as setting a linear band. There is just one additional parameter to be adjusted by the user, the threshold control. This makes multi-band dynamic control as easy and as versatile as adjusting a parametric equalizer. The dynamic EQ can be used as a de-esser or to give the bass an extra punch etc..
Bands 1, 2, 5 and 6 are the dynamic bands (each individually switchable to linear) and bands 3, 4 and 7 are ordinary linear bands. A dynamic band operates similar to a compressor, with two additional features:
1) The band is sensitive to signal level in its frequency range only. So when applying dynamic bass EQ, only the bass-band of the program affects the dynamic behavior. There is no cross-modulation from other bands.
2) The gain is only applied to certain frequencies, and not across the whole audio band.
3) Other modes (low-cut, high-cut, low-shelving, high-shelving) are linear (no automatic boost/cut adjustment), and behave exactly the same as in the EQ1-MK2.
The reason for choosing exactly bands 1, 2, 5 and 6 is the following: As the name implies, a dynamic band is sensitive to the level of the input signal. Sometimes it is desirable to first add some EQ, and afterwards dynamically add some more. Or vice versa, first do some dynamic corrections and afterwards add overall EQ, including in the corrected band. Because the EQ bands are connected in series, this is only possible if there are linear bands before and after the dynamic bands.

EQ1-DYN-LP, Dynamic and Linear Phase EQ in a single unit
The EQ1-DYN-LP contains both the Dynamic and the Linear Phase EQ programs. After power-up of the unit, the user can chose between Dynamic (DYN) and Linear Phase (LP) modes. The workspace storage, the snapshots and the snapshot backups are fully independent between the DYN and LP parts of the unit. This means that all setup data are retained in any case.

Power
Mains voltage: 115 V or 230 V with voltage selector
Fuse rating: 500 mA slow blow
Power consumption: 40 VA max.

Size
Depth: 30 cm
Width: 43,3 cm (19″)
Height: 8,8 cm (2HU)

AES/EBU Input
Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
Maximum input word-length: 24 Bits
Channel Status Data: Input accepts professional or consumer format
Channel Status Data Bits forwarded to AES/EBU output: see table below
Connector: XLR female

AES/EBU Output
Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz (always the same as the input)
Output word-length: 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 output Channel Status Data Bits are generated in the various conversion modes.

Output selected: Consumer format, Input: Consumer format:
All Bits fed forward (transparent), except for Byte 1:
• Bits 0…6: 0000000 (category code general)
• Bit 7: 1 (original)

Output selected: Consumer format. Input: Professional format:
Byte 0:
• Bit 0: 0 (consumer)
• Bit 1: 0 (audio)
• Bit 2: 1 (copy allowed)
• Bits 3, 4: Pre-emphasis according to input
• Bit 5: 0 (two 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 (accuracy grade II)
• Bits 6, 7: 00

Bytes 3…23: Reserved bytes

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

Output selected: Professional format. Input: Consumer format:
Byte 0:
• Bit 0: 1 (professional)
• Bit 1: 0 (audio)
• Bits 2, 3, 4: Pre-emphasis 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 = 24 Bit)
• 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:
• All Bits fed forward (transparent), except if EQ not bypassed for Byte 2:
• Bits 0, 1, 2: 001 (max. sample length = 24 Bit)
• Bits 3, 4, 5: 101 (24 Bit word-length)
• Bits 6, 7: 00

Overload
Number of consecutive over-samples to cause “over” display: 1…16 selectable

Filters
The filter topology used in the EQ1 is a very low noise filter structure for a state of the art performance.

Parameter Tables
Center/corner frequencies (Hz):
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/Cut, applicable to shelving and peaking filters (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

Threshold, applicable to dynamic peaking filters (dB):
0, −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

Slope, applicable to cut filters:
0 dB/octave, 6 dB/octave, 12 dB/octave

Overall Gain (dB):
off, −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
Dither:
Dithering algorithms are implemented using the POW-R set of algorithms, i.e. POW-R #1, POW-R #2, POW-R #3

MIDI Remote Control Protocol
All band parameters plus the controls parameters are remote controllable. Each parameter has its corresponding MIDI controller number. According to the different parameters, the controllers are limited in their range. Invalid values are replaced by the maximum allowable values. Details can be found in the EQ1 manuals.