bhi Ltd
ParaPro EQ20-DSP
ParaPro EQ20
Quickstart Guide for bhi ParaPro EQ20 Range
Introduction
The bhi ParaPro EQ20 range of audio DSP units feature a 20W modular audio power amplifier with a
parametric equaliser plus the option of the latest bhi dual Channel DSP noise cancelling technology and
Bluetooth technology. The parametric equaliser allows any specific part of the frequency range to be
selected and adjusted in strength. The user is then able to adjust these parameters to determine exactly
how the equalization is applied. The most important feature of a parametric equaliser is that it allows you
to select which frequency to adjust. For example, instead of having a simple mid-range adjustment as in
a standard graphic equaliser which boosts or reduces a pre-set range of frequencies, you can specify
exactly which frequency to boost or reduce. This gives you greater flexibility and accuracy to set the audio
to suit your own hearing.
The bhi DSP noise cancelling option provides mono and stereo DSP noise cancellation to improve the
speech quality in all types of radio and voice communications and the Bluetooth option allows the user to
transmit audio from their Bluetooth enabled device through the EQ20, effectively turning their wired
speakers that are connected to the EQ20 unit into Bluetooth speakers.
Each ParaPro EQ20 unit is supplied with a selection of cables and connectors to enable you to connect to
your radio and speaker/speakers or headphones, and start enjoying the superb audio quality of your bhi
ParaPro EQ20 audio DSP unit.
Accessories and options
Your bhi ParaPro EQ20 product is supplied with the following:
EQ20 & EQ20B versions (Non DSP noise cancelling)
1 x ALD-007 - 3.5mm stereo jack plug to 3.5mm jack plug lead 1.2M long.
2 x ALD-001 - 3.5mm mono jack plug to 3.5mm mono jack plug lead 1.2m long.
2 x 4mm red banana plugs – 2 x red banana plugs with screw terminals for speaker connection
2 x 4mm black banana plugs - 2 x black banana plugs with screw terminals for speaker connection
1 x 1030-FPL – Fused DC power lead
1 x PSU12-2A-ROW – UK/US/EU/AUS 12V DC 2 Amp mains plug-in power supply 2.1mm plug Centre
+VE
2 x ADP-P004 - Phono Plug to 3.5mm Mono Socket
Quick start user guide
Feedback card
EQ20-DSP & EQ20B-DSP (DSP noise cancelling versions)
1 x ALD-007 - 3.5mm stereo jack plug to 3.5mm jack plug lead 1.2M long.
2 x ALD-001 - 3.5mm mono jack plug to 3.5mm mono jack plug lead 1.2m long.
2 x 4mm red banana plugs – 2 x red banana plugs with screw terminals for speaker connection
2 x 4mm black banana plugs - 2 x black banana plugs with screw terminals for speaker connection
1 x 1030-FPL – Fused DC power lead
2 x ADP-P004 - Phono Plug to 3.5mm Mono Socket
Quick start user guide
Feedback card
Optional extras:
1 x PSU12-2A-ROW – UK/US/EU/AUS 12V DC 2 Amp mains plug-in power supply 2.1mm plug Centre
+VE
Before you Begin
Using the rear panel diagram and descriptions of each connection below, connect your equipment to the
relevant sockets using the connections on the rear of the unit to suit your own setup. Connect the power.
Using the unit
Once you are ready to use the unit turn the power supply on and switch the EQ20 unit on using the green
on/off button. Switch on your radio, receiver or audio source and set the various controls to tailor the
audio to your own individual taste.
Try adjusting the Bass and treble controls along with the boost or cut function for each control to give you
the best audio for your ears. For the EQ only units without DSP this will just be a case of adjusting the
audio. For EQ-DSP users there is the added feature of adjusting the DSP noise filter to remove noise
and interference to give you improved speech quality. Increasing the “DSP Noise Filter” (12) control will
further reduce the background noises and enhance any voice signals. Adjust the unit until you find a
suitable filter level for the current signal you are listening to.
You may find that you have to increase the appropriate Volume Level after increasing the filter level as
the effect of the noise reduction reduces the mean audio level so that everything sounds quieter (this is
because you have reduced the noise level significantly). You can get a feel for how much clearer the
Noise Reduction is making the signal by switching the “DSP Noise Filter” (12) control fully anticlockwise
to DSP off, and then clockwise back to the selected filter level. Note that the DSP algorithm may take a
short while to take full effect, approximately 500 ms, dependent on the noise content of the signal.
Bluetooth
The Bluetooth function is enabled by pressing the “Sel” (6) until the Bluetooth LED illuminates. Once you
have done this make sure that you enable the Bluetooth scan function on your Bluetooth input source
device so that you can pair with your EQ20 unit. You should see a Bluetooth device named
“ParaProxxxx” identified in your Bluetooth device list. Connect to this device and you will then be
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connected via Bluetooth to your Bluetooth enabled bhi ParaPro EQ20 unit. Select the audio on your
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device and this should now play out of the speakers that you have connected to your device or through
headphones if connected to the front of the unit (9). This in effect turns your speakers into Bluetooth
speakers. Adjust the volume control on your device as well as the Volume control on the EQ20 unit to get
the desired audio output. Adjusting the Bass and treble controls along with the boost or cut function for
each control to give you the best audio for your ears. For the EQ only units without DSP this will just be a
case of adjusting the audio response to suit your ears.
Note: See the section “Notes for EQ User Guide” for a more in depth explanation of the input signal
levels and parametric equaliser settings
Front Panel Controls and display indications
Rear Panel connections
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Input connections:
19 – Ch1 3.5mm mono socket
20 – Stereo input, 3.5mm stereo socket (Main connection for stereo line level inputs)
21 – Ch2 3.5mm mono socket
22 – 12V DC input socket, 2.1mm centre positive (2A)
Audio output connections
13 – Speaker output Right channel gnd, 4mm socket (Black)
14 – Speaker output Right channel signal, 4mm socket (Red)
15 – Speaker output Left channel gnd, 4mm socket (Black)
16 - Speaker output Left channel signal, 4mm socket (Red)
17 – Speaker output Right channel RCA phono socket (Red)
18 – Speaker output Left channel RCA phono socket (White)
Front Panel Controls and connections
1 - Power on/off volume control. Push to switch the unit on and off (source select LED’s will light in
sequence). Rotate clockwise to increase volume.
2 – Bass tone control 100Hz to 1 kHz. Rotate clockwise to increase Bass frequency (use in conjunction
with Bass boost or cut control. See Notes for EQ20.
3 – Treble tone control - 1 kHz TO 10 kHz. Rotate to treble increase frequency (use in conjunction with
treble boost and cut function). See Notes for EQ20.
4 – Ch1 select LED. Lights orange when Channel 1 is selected.
5 – Ch2 select LED. Lights red when Channel 2 is selected.
6 – Audio input select button. Press to select input source.
7 - Stereo audio select LED. Lights green when stereo audio is selected.
8 – Bluetooth select LED. Lights blue when Bluetooth is selected. Pair with input device Bluetooth and
play audio through EQ20 via Bluetooth.
9 – 3.5mm stereo socket. Stereo headphone socket. Listen with stereo headphones. Speaker output
muted once headphones are plugged-in.
10 – Treble boot or cut control. Booth or cut your selected frequency by + or – 10dB.
11 - Bass boost or cut control. Booth or cut your selected frequency by + or – 10dB.
12 – DSP noise filter control. Fully anticlockwise audio bypassed DSP not selected. Rotate clockwise to
increase filter level from 9 to 40dB of noise reduction.
Notes for EQ20 User Guide
Input signal level
The input signal(s) must be as high as possible that does not cause clipping. This will ensure the best
possible performance of the DSP noise filtering function.
The currently selected input channel is shown with an illuminated LED. That LED will flash rapidly for 1.5
seconds if it detects a peak in the signal that is likely to cause clipping.
The input signal level is controlled from the signal source equipment (not the EQ20 unit). Adjust the
source level so that it is marginally below the level that causes the LED on the EQ20 unit to start flashing
(overload detection).
Very occasional flashing of the LED is ok, there is some margin before the onset of clipping occurs.
Clipping distortion can be very severe if the input signal is much too high, so ensure your source signal is
not too high.
Signal-to-noise-ratio and also the performance of the DSP noise filtering will not be optimum if your input
signal is much too low. An input signal “just” lower than the clipping limit is ideal.
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