High Voltage Audio HVA-NEQ Manual de usuario
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
g
VOLTAGE
1.3
1.6
1.0
30
25
20
38
47
57
131
162
200
106
86
70
1.0
0.5
± 0
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
Q
1.0
0.5
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
Q
1.0
0.5
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
Q
1.0
0.5
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
Q
156
126
102
193
236
288
689
856
1k
558
448
362
610
497
405
752
926
1k1
2k6
3k2
4k
2k1
1k7
1k4
3k
2k4
2k
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
dB
Hz
1.0
0.5
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
1.0
0.5
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
1.0
0.5
1.5
2.0
2.5
4.5
5.0
5.5
4.0
3.5
3.0
dB
Hz
POWER
Hz
5k7
8k4
4k1
10k5
15k3
Hz Hz
R/S
CHANNEL
± 0
± 0
± 0 ± 0 ± 0 ± 0 ± 0
Hz
2.2
3.0
LF
LMF
HMF
HF
LF
LMF
HMF
HF
L-R
M-S
BYP
L-R
M-S
BOOST
CUT
OUT
x½
x2
x1
BOOST
CUT
x½
x2
BOOST
CUT
x½
x2
BOOST
CUT
x½
x2
BYP
30
25
20
38
47
57
131
162
200
106
86
70
156
126
102
193
236
288
689
856
1k
558
448
362
610
497
405
752
926
1k1
2k6
3k2
4k
2k1
1k7
1k4
3k
2k4
2k
3k7
4k6
5k7
13k1
16k2
20k
10k6
8k6
7k0
LPF
HPF
34
44
26
20
58
78
34
44
26
20
58
78
23k
5k7 8k4
4k1
10k5
15k3
23k
IN
OUT
IN
OUT
OUT
x1
OUT
x1
OUT
x1
BOOST
CUT
OUT
x½
x2
x1
BOOST
CUT
x½
x2
BOOST
CUT
x½
x2
BOOST
CUT
x½
x2
IN
OUT
IN
OUT
OUT
x1
OUT
x1
OUT
x1
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.
F
CAUTION: HIGH
g
VOLTAGE
!
RISK OF ELECTRIC SHOCK
!! WARNING !!
~100 - 250VAC
50 Hz/60 Hz
RIGHT CHANNEL
LEFT CHANNEL
HIGH
g
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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