High Voltage Audio HVA-NEQ Manuale utente

HVA-NEQ

PARAMETRIC EQUALIZER

USER GUIDE

HIGHgVOLTAGE

A U D I O

WWW.HIGHVOLTAGEAUDIO.NET

FCAUTION: HIGHgVOLTAGE !

RISK OF ELECTRIC SHOCK

!! WARNING !!

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 AND FUSE SELECTION

This equipment is capable of operating over a range of mains voltages to cater for all

regions.

To avoid the risk of fire, replace the mains fuse only with a T500mAL (M205 SLO-BLO

only).

| 3

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 manufacturer of boutique audio electronics based in

Australia. 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.

Our products are staples in the racks of renowned mix and mastering studios all over

the world. We design products that are accessible for professionals and enthusiasts

alike.

OVERVIEW

The High Voltage Audio HVA-NEQ parametric equalizer is a powerful, dual-channel

mastering EQ designed with the professional mastering engineer in mind. Each

channel features four precise fully parametric bands, each with a variable Q/shelf,

frequency and cut/boost controls with gain multipliers, low and high pass filters, and

a switchable mid/side matrix to allow for greater flexibility with program material. All

controls are stepped, allowing for precision recall and stereo tracking.

All four bands and low/high pass filters can be independently switched in or out,

allowing for the efficient auditioning of each band or filter. Each band is equipped

with an adjustable Q control which adjusts the bandwidth of each band. The low and

high frequency bands are equipped with a switchable shelf, perfect for adding low

end energy or high frequency sheen.

The gain multiplier toggle switches allow for the fine tuning the amplitude of the

cut/boost switches. This allows for minute corrections to be performed with the x½

multiplier or larger cut/boosts with either the x1 or x2 multiplier selected. The

powerful gain multiplier feature allows for the HVA-NEQ to be easily adapted to

mixing applications where a greater cut/boost range is desired. Each gain switch can

be instantly toggled between cut, boost, or band-bypass.

The HVA-NEQ features a high efficiency, EMI filtered switch mode power supply with

additional filtering added to ensure clean, interference-free performance with a

universal input voltage range to cater for all regions.

| 5

front PANEL CONTROLS

POWER

A single illuminated pushbutton, when latched, will power the unit ready for use with a

white LED indicator within the switch.

M-S / BYP / L-R

Toggles the selections of either MID-SIDE or LEFT-RIGHT processing of the signal.

The centre position completely removes the unit from the signal path for a true bypass.

In M-S mode, the signal is encoded to Mid (M=L+R) and Side (S=L-R) before the EQ

circuit. After the EQ circuit, the signal is decoded back to Land Ragain.

NOTE: M-S mode requires both channels to be engaged.

HPF – HIGH PASS FILTER

A 6 position rotary control to select the roll off frequency of the high pass filter (HPF).

The associated toggle switch engages the filter when IN is selected.

LPF – LOW PASS FILTER

A 6 position rotary control to select the roll off frequency of the low pass filter (LPF).

The associated toggle switch engages the filter when IN is selected.

Hz - FREQUENCY

Each band has a 12 position rotary control to select the centre frequency of the filter.

dB - GAIN

Each band has a 12 position rotary control to adjust the amount of equalization

applied to the signal of the filter. Each GAIN control has an associated BOOST /

OUT / CUT toggle which controls the desired amplitude of the signal, or bypassed.

OUT is a hardwire bypass for that band. To use a band, you must select to boost or

cut prior to equalization. GAIN controls also have an associated x2 / x1 / x½

multiplier toggle. With this selected in x1 mode, the dB gain scale on the front panel

is adhered, providing 0.5dB increments in the GAIN control. By selecting x2, the

gain scale numbers are multiplied to allow for large 1.0dB increments in the GAIN

control. Selecting x½halves the indicated gain scale, providing 0.25dB increments.

NOTE: Although accurate stereo tracking is always maintained between channels at

every gain/multiplier setting, there may be some minor variance in actual dB vs front

PARAMETRIC

EQUALIZER

HVA-NEQ

HIGH

VOLTAGE

1.3

1.6

1.0

131

162

200

106

1.0

0.5

± 0

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

156

126

102

193

236

288

689

856

558

448

362

610

497

405

752

926

1k1

2k6

3k2

2k1

1k7

1k4

2k4

3k7

4k6

5k7

13k1

16k2

20k

10k6

8k6

7k0

L/M

CHANNEL

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

1.0

0.5

1.5

2.0

2.5

4.5

5.0

5.5

4.0

3.5

3.0

POWER

5k7

8k4

4k1

10k5

15k3

Hz Hz

R/S

CHANNEL

± 0

± 0 ± 0 ± 0 ± 0 ± 0

2.2

3.0

LMF

HMF

LMF

HMF

L-R

M-S

BYP

L-R

M-S

BOOST

CUT

OUT

x½

BOOST

CUT

x½

BOOST

CUT

x½

BOOST

CUT

x½

BYP

131

162

200

106

156

126

102

193

236

288

689

856

558

448

362

610

497

405

752

926

1k1

2k6

3k2

2k1

1k7

1k4

2k4

3k7

4k6

5k7

13k1

16k2

20k

10k6

8k6

7k0

LPF

HPF

23k

5k7 8k4

4k1

10k5

15k3

23k

OUT

BOOST

CUT

OUT

x½

BOOST

CUT

x½

BOOST

CUT

x½

BOOST

CUT

x½

OUT

1.3

1.6

1.0

2.2

3.0

1.3 1.6

1.0

2.2

3.0

1.3

1.6

1.0

2.2

3.0

1.3 1.6

1.0

Q Q Q Q

2.2

3.0

1.3 1.6

1.0

2.2

3.0

1.3 1.6

1.0

2.2

3.0

1.3 1.6

1.0

2.2

3.0

panel dB figures due to parts tolerances. The multiplier toggle will effectively provide

36 step gain controls per band!

Q – BANDWIDTH

Each band has a rotary control to adjust the desired bandwidth of the ‘bell’ filter,

ranging between and indicated 1.0 and 3.0 (calculated). Due to parts tolerances, the

Q factor may vary and typical real world measurements of the bands are more within

0.7 and 2.2.

NOTE: Despite the aforementioned variance in Q figures, precise channel tracking is

still maintained.

The LF and HF bands have an additional step to enable shelf mode.

| 7

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. This equipment is

capable of operating between 100V-250VAC to cater for all regions.

PLEASE REFER TO THE VOLTAGE AND FUSE SELECTION SECTION ON PAGE

2 PRIOR TO POWERING YOUR UNIT.

CAUTION: HIGH

VOLTAGE

RISK OF ELECTRIC SHOCK

!! WARNING !!

~100 - 250VAC

50 Hz/60 Hz

RIGHT CHANNEL

LEFT CHANNEL

HIGH

VOLTAGE

HVA-NEQ

PARAMETRIC

EQUALIZER

OUTPUT OUTPUT

INPUTINPUT

AC INPUT

frequency GRAPHS (L-R mode)

LF band @ 20 Hz -Conditions: Gain Max, Multiplier x1, Q: 1.6 (centered)

LMF band @ 102 Hz -Conditions: Gain Max, Multiplier x1, Q: 1.6 (centered)

HMF band @ 405 Hz -Conditions: Gain Max, Multiplier x1, Q: 1.6 (centered)

| 9

HF band @ 2 kHz -Conditions: Gain Max, Multiplier x1, Q: 1.6 (centered)

Q @ 2 kHz – Conditions: (HF band, including shelf)

HPF – HIGH PASS FILTER

LPF – LOW PASS FILTER

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