KV2 Audio JKP - Manual (Page 8)

MONITOR OUT INPUT
LINE OUT
NOTCH
FREQ
PHASE GAIN
JK
A
JKA - Acoustic DI BOX - Line Driver
Features
8
JKA Block diagram
M A D E I N C Z E C H R E P U B L I C
2
3
1
LINE OUT
PHANTOM POWERED
LOW Z 50Ω
MONITOR OUT
600Ω
INPUT
JACK 1/4
ON
NOTCH FILTER
- 6dB
0dB
-12dB
GAIN
0dB
PHASE
+10dB
NOTCH FREQ
JKA - Acoustic DI BOX - Line Driver
The JKA is a dedicated DI for acoustic instruments. The JKA features a
high-impedance 1/4” jack input capable of receiving signal from all types of pick-ups.
A +10dB gain boost is available for low-level instruments. The JKA also features a
tunable notch filter for eliminating the resonant frequency in an acoustic instrument,
reducing feedback issues.
1. Phantom Power Supply
For ease of use, maximum headroom and low noise the, JK1 is powered by phantom
power from the mixing console. A green LED indicates the presence of phantom
power. Simply switch on phantom power on your console and you are good to go.
2. High Impedance Input
The JKA includes one 1/4“ high impedance jack input. It is adapted to connect the
pick-up of acoustic instruments that require high load impedance (e.g. Piezo electric
pick-ups). By using the GAIN selector switch, the amplification of the JKA can be
increased by +10dB.
3. Line Out XLR Output
The main symmetrical LINE OUT output works with an impedance of 50Ω
and it is intended for connection to a mixing desk. The output is not
separated galvanically from the input.
4. Monitor Out 1/4“ Jack Output
The adjacent symmetrical MONITOR OUT 1/4“ jack output has an
impedance of 100Ω, the same level as LINE OUT and it is separated from
the main output using a transformer. When using a mono jack the relevant
input is switched automatically to the asymmetrical mode. It can be used
for monitoring on the stage.
5. Tunable NOTCH Filter
To eliminate the dominant self-resonance, (feedback) of any acoustic
instrument, the JKA is equipped with a phase switch selector and a tunable
NOTCH filter with a switchable attenuation level of - 6dB and -12dB.
Recommended method of adjustment for the NOTCH filter:
a) Increase the amplification until the acoustic instrument feeds back
b) Suppress the acoustic feedback at low frequencies using the PHASE
switch
c) Increase the amplification until the acoustic instrument feeds back
again, put the NOTCH switch selector to the - 6dB position and eliminate
the feedback by use of the potentiometer. If the acoustic feedback
continues to happen at the same frequency put the NOTCH switch
selector in the -12dB position.
6. PHASE Switch Selector
Selects between 0° and 180° for LINE OUT output. This switches the XLR pin-2 and pin-3 to interface with
older equipment. Also can be used when the instrument is being reproduced by the DI and microphone to
avoid cancellation.
JKA - FRONT PANEL
JKA - REAR PANEL
JKA, ACOUSTIC DI BOX
Product number:
KVV 987 204
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