High Voltage Audio EQ-6S User Manual

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EQ-6S

6-BAND STEREO EQUALIZER

USER GUIDE

HIGHgVOLTAGE

A U D I O

WWW.HIGHVOLTAGEAUDIO.NET

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F CAUTION: HIGHgVOLTAGE !

RISK OF ELECTRIC SHOCK

!! WARNING !!

SET AC VOLTAGE SELECTION INSIDE BEFORE USE

HEALTH AND SAFETY

- Always read these complete instructions before operating the equipment.

- Always use a properly grounded IEC cable with this equipment and never defeat the grounding pin as this provides not only a safety ground but is required for low noise operation.

- Avoid using this equipment around stray magnetic fields. The enclosure is designed to shield the circuits from magnetic fields and radio interference and so during racking of the equipment it’s important to ensure typical grounding procedures are followed.

- Avoid the use of the equipment in high temperature environments as this can degrade the performance and reduce the lifetime of the internal components.

- There are some internally accessible adjustments in this equipment. If there is a requirement to perform internal adjustments, please ensure one is comfortable with opening the equipment and performing said adjustments. Please seek qualified assistance if unsure.

- If adjustments are to be made to this equipment, please disconnect the equipment from mains power prior to opening the equipment and performing the adjustment. While we understand that some adjustments are to be made with the equipment live, any damage to the equipment as a result of dropped metal objects or liquid damage will not be covered by the warranty.

HIGH VOLTAGE AUDIO reserves the right to change the specifications or modify the designs of its equipment. Company contact information is on the last page of this manual.

VOLTAGE SELECTION AND FUSE

This equipment is capable of operating over a range of mains voltages to cater for various regions. Please ensure the correct mains voltage setting and correct fuse are used prior to connecting the equipment to mains. To avoid the risk of fire, replace the mains fuse only with the correct value.

For mains voltages from 100-120 VAC, use a T200mAL (M205 SLO-BLO only) and configure the internal mains voltage selector to display 115V. For mains voltages from 200-240 VAC, use a T100mAL (M205 SLO-BLO only) and configure the internal mains voltage selector to display 230V.

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THANK YOU FOR CHOOSING

HIGHgVOLTAGE

A U D I O

Thank you for choosing products from HIGH VOLTAGE AUDIO. We expect you will be satisfied with the quality, performance and value of our products, which are made possible through careful design and construction choices.

ABOUT HIGH VOLTAGE AUDIO

HIGH VOLTAGE AUDIO is a partnership based in Australia, working out of both Melbourne and Perth. We go to every effort to accurately create the tone, feel and functionality of great outboard gear. Our work is the culmination of years of experience in sound production and electronics. Our products are built here in Australia, so our customers can have the confidence that they will purchase a product that not only sounds great, but is dependable, reliable and easy to use.

In 2017, we shipped our acclaimed bus compressors all over Australia, and all over the globe.

In 2018, we are proud to begin the year by launching our first equalizer product offering, in the form of the HIGH VOLTAGE AUDIO EQ-6S - a mastering grade six (6) band stereo equalizer.

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OVERVIEW

The HIGH VOLTAGE AUDIO EQ-6S is a six (6) band, mastering grade stereo equalizer. With its precision built stepped rotary switches, at 0.5 dB steps for a total +/- 5.5 dB range, the EQ-6S provides perfect stereo tracking and ease of recall.

The EQ-6S equalizer is a broad-stroke, sound sculpting device with five (5) fixed frequency bands and a frequency switchable, high shelf PRESENCE FILTER.

Unlike the majority of equalizers on the market, the EQ-6S is a dedicated stereo equalizer. With one set of controls under the hood, the EQ-6S is incredibly quick and easy to dial in.

Compared to its rivals, the EQ-6S boasts unrivaled control, precision, noise performance and value. The EQ-6S is capable of broad, colourful EQ sculpting, perfect for adding character as well as high end sparkle to mixes.

LETS GET TECHNICAL

Each of the EQ-6S filter bands are built around non-inverting gain stages sitting between 6 dB/Octave high and low pass filters. The filters are designed to be four times the previous band and the signal exits the previous band at a drop of -6 dB. The signal then flows into the following stage to add back up to 0 dB.

Since non-inverting gain stages have a positive voltage gain, the EQ-6S’s bands all interact with one another to an extent. When increasing the gain of the

PRESENCE FILTER

, there will be an

overall increase in gain across the whole frequency response.

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REAR PANEL CONNECTIONS

The rear panel features XLR INPUT and OUTPUT connectors for the LEFT and RIGHT channels. These connections have been wired PIN 2 HOT to conform with AES standards.

NOTE: To run in unbalanced mode, ensure your unbalanced cable ties pin 3 to pin 1 at the cable.

The AC INPUT connection is a typical 3 pin IEC power cable. You must use the correct fuse value and ensure the internal voltage selector meets the requirements for your region.

PLEASE REFER TO THE VOLTAGE SELECTION AND FUSE SECTION ON PAGE 2 PRIOR TO POWERING YOUR UNIT.

front PANEL CONTROLS

The front panel features five (5) fixed frequency controls for each band. A separate

PRESENCE

FILTER

control, consisting of an additive-only gain control and a six (6) step frequency selector.

The IN illuminated push button, when pushed in, will engage both channels simultaneously. When this push button is out and non-illuminated, both channels will be disengaged and will perform a true bypass of the equipment.

The

POWER

illuminated push button, when pushed in, will power the unit ready for use. When

this push button is out and non-illuminated, the equipment is in a powered down state.

RIGHT CHANNEL

LEFT CHANNEL

OUTPUT OUTPUT

INPUT

AC INPUT

CAUTION: HIGHgVOLTAGE

RISK OF ELECTRIC SHOCK

!! WARNING !!

SET AC VOLTAGE SELECTION INSIDE BEFORE USE

40 Hz

160 Hz

2k5 Hz

POWER

650 Hz

FREQUENCY

GAIN

EQ-6S

STEREO

EQUALIZER

6-BAND STEREO EQUALIZER

HIGHgVOLTAGE

A U D I O

SUB

PRESENCE FILTER

-5

-3

-2

-1

-4

OFF

10k

2k55k40k

20k

-5

-3

-2

-1

-4

-5

-3

-2

-1

-4

-5

-3

-2

-1

-4

-5

-3

-2

-1

-4

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frequency BANDS

SUB (10 Hz)

Fixed frequency, bell shaped boost and cut (+/- 5.5 dB @ 0.5 dB steps)

TIP

: The 10 Hz frequency can be utilized as a 40 Hz HIGH PASS filter at full -5.5 dB cut!

40 Hz

Fixed frequency, bell shaped boost and cut (+/- 5.5 dB @ 0.5 dB steps)

Bypass

Sub Max Cut

Sub Max Boost

Bypass

Sub Max Cut

Sub Max Boost

-6

-5

-4

-3

-2

-1

Magnitude (dB)

10 100 1k 10k

Frequency (Hz)

Frequency Response

Bypass

Sub Max Cut

Sub Max Boost

Bypass

40Hz Max Cut

40Hz Max Boost

Bypass

40Hz Max Cut

40Hz Max Boost

-6

-5

-4

-3

-2

-1

Magnitude (dB)

10 100 1k 10k

Frequency (Hz)

Frequency Response

Bypass

40Hz Max Cut

40Hz Max Boost

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160 Hz: Fixed frequency, bell shaped boost and cut (+/- 5.5 dB @ 0.5 dB steps)

650 Hz: Fixed frequency, bell shaped boost and cut (+/- 5.5 dB @ 0.5 dB steps)

Bypass

160Hz Max Cut

160Hz Max Boost

Bypass

160Hz Max Cut

160Hz Max Boost

-6

-5

-4

-3

-2

-1

Magnitude (dB)

10 100 1k 10k

Frequency (Hz)

Frequency Response

Bypass

160Hz Max Cut

160Hz Max Boost

Bypass

650Hz Max Cut

650Hz Max Boost

Bypass

650Hz Max Cut

650Hz Max Boost

-6

-5

-4

-3

-2

-1

Magnitude (dB)

10 100 1k 10k

Frequency (Hz)

Frequency Response

Bypass

650Hz Max Cut

650Hz Max Boost

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2.5 kHz: Fixed frequency, high shelf boost and cut (+/- 5.5 dB @ 0.5 dB steps)

PRESENCE: Selectable frequency as indicated, high shelving boost (+ 11 dB @ 0.5 dB steps)

Bypass

2k5Hz Max Cut

2k5Hz Max Boost

Bypass

2k5Hz Max Cut

2k5Hz Max Boost

-10

Magnitude (dB)

10 100 1k 10k

Frequency (Hz)

Frequency Response

Bypass

2k5Hz Max Cut

2k5Hz Max Boost

Presence Max 2k5Hz Presence Max 5kHz Presence Max 10kHz Presence Max 20kHz Presence Max 40kHz

Magnitude (dB)

10 100 1k 10k

Frequency (Hz)

Frequency Response

Presence Max 2k5Hz Presence Max 5kHz Presence Max 10kHz Presence Max 20kHz Presence Max 40kHz

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INTERNAL ADJUSTMENTS

INPUT GAIN ADJUSTMENT

The EQ-6S has internal INPUT GAIN adjustment trimmers for both left and right channels and is calibrated before shipment. If further adjustment is required, unity gain calibration can be performed as follows:

1. Ensure the equipment is powered OFF and the IEC power cable is unplugged, but the XLR input and output cables are connected.

2. Viewing from the top of the enclosure, unscrew the two (2) Philips head screws that are located toward the rear of the case and carefully pry the lid upward; a suction cup is handy for this task.

3. Carefully plug the IEC power cable and push both

POWER

button to be illuminated.

4. Feed a -12 dB, 1kHz sine wave tone using a signal generator from your DAW into each channel and take a note of the signal on each channel of your DAW software where the generator is feeding the EQ-6S channels (e.g. -10.5 dBFS).

5. Now push the IN button to be illuminated and take a note of the DAW master output signal, reset this signal by clicking the indicated dB signal of the channel (e.g. -11.2 dBFS).

6. Adjust the trimmer for each channel separately and ensure that the master output measures the same as the the measurement taken in step 4 (e.g. -10.5 dBFS).

7. Once both channels have the same signal measure when both IN and bypassed, calibration is complete.

8. Carefully POWER OFF the unit and re-assemble the lid by sliding the lid firstly toward the front of the unit at an angle, then dropping the rear of the lid into the enclosure. Screw the two (2) Philips head screws back into the enclosure.

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SPECIFICATIONS

Frequency Response

+/- 0.3 dB, 10 Hz to 70 kHz

Maximum headroom

Approximately +28 dBu @ 10K Ohms

Noise floor

< -105 dB SNR

Total harmonic distortion

< 0.003%

Input Impedance (balanced)

48 K Ohms

Output Impedance (balanced)

50 Ohms

Replacement fuses (M205)

USA (100-120VAC) 200mA Slo-Blo

EU, AU (200-240VAC) 100mA Slo-Blo

*Specifications subject to change without notice.

WARRANTY

HIGH VOLTAGE AUDIO warrant our products with a standard warranty period of one (1) year from the date of purchase for parts and labour, subject to inspection. Products will be free of manufacturing defects. This warranty does not include damage incurred through shipment, rough user operation of the product or modifications or attempted repair by unauthorized personnel. This warranty is offered solely to the original purchaser of the product, directly from HIGH VOLTAGE AUDIO and is not transferrable. This warranty does not include shipping charges to and from HIGH VOLTAGE AUDIO.

Warranty service communication must be conducted directly through HIGH VOLTAGE AUDIO.

HIGH VOLTAGE AUDIO reserves the right to alter the design of their products and specifications without notice.

CONTACT

web: http://www.highvoltageaudio.net facebook: http://www.facebook.com/hvaudio instagram: http://www.instagram.com/hvaau email: [email protected]

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HIGHgVOLTAGE

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