PJB D-600 User manual

PJB D-600
OWNER’S MANUAL

Thank you for purchasing the PJB D-600. A great deal of dedication and
passion went into designing and building this no compromise, high
performance compact amplifier. It was conceived to be a dedicated amplifier
for the “connoisseur” bassist. Reading this manual will enable you to get the
bestperformancefrom itso that you may enjoy many years of service.
READ THIS FIRST
•Before using the D-600 please read ALL theinstructions.
•On receipt of product, check for any signs ofphysicaldamagearisingfrom
shipping. If any damage is visible contactyourdealer.
•Keep all original packing.
•Do not use this amplifier in a waythat would compromise its ventilation system.
When operating, never coverthe heatsinkon rearpanel.
•Donotlocatethisamplifiernearany heatsource.
•This amplifier must be connected only to a powersourcespecifiedin this manual.
•For safety do not leave the amplifier plugged into a power source for long
periods of time when not in use.
•Do not let any liquid or foreign objects fallintoanyopeningsonthe amplifier.
•Never use this amplifier if it has:
1. Suffered any physical damage.
2.Been subjectedto anyliquids,rainormoisture.
3. Damaged cables connected to it.
If any of the above occurs, the amplifier shouldbeexaminedbyqualifiedservice
personnel.
•Always operate this amplifier with the correctly rated fuse.
•Neverusethisamplifierwithoutproper grounding.
•The mains plug is used as disconnect device, the disconnect device shall
remain readily operable.
•Protective earthing terminal. The apparatus should be connected to a
mains socket outlet with a protective earthing connection.
•Correct Disposal of this product. This marking indicates that this product
should not be disposed with other household wastes throughout the EU. To
prevent possible harm to the environment or human health from
uncontrolled waste disposal, recycle it responsibly to promote the sustainable
reuse of material resources.
•The apparatus shall not be exposed to dripping or splashing.

FRONT PANEL AND BACK PANEL OVERVIEW
POWER
ON
HI-TREBLE
+18dB-18dB
0
MID
-18dB
0
+18dB
HI-BASS
+18dB-18dB
0MID
-18dB
0
+18dB
LINE IN
INPUT A
INPUT B AUX IN
LIMITER
LEVEL LEVEL
123 5678910 11 12
14 15 17 18 19 20 21 22 23 24 25 26
16
413
27
O
I
OVERLOAD INPUT LEVEL
+18dB-18dB
0LO-BASS
+18dB
0
-18dB
LO-TREBLE
+18dB-18dB
0HI-TREBLE
+18dB-18dB
0
MAXMINMINMAX
OFF
ON
VOLUME
MAXMIN
HEADPHONE
OVERLOAD
LOW
HIGH
MUTE
LOW
HIGH
MUTE
INPUT LEVEL
+18dB-18dB
0LO-BASS
+18dB
0
-18dB
LO-TREBLE
+18dB-18dB
0
HI-BASS
+18dB-18dB
0
115V 230V
3028 29 31 32 33 34 35 36
EXT. SPEAKER
DI OUT
LIFT
TUNER FX SEND
MINIMUM IMPEDANCE 4 OHMS
PRE-AMP OUT
GROUND
FX RETURN
VOLTAGE SELECTOR
AC~INPUT
CAUTION
PULL MAIN PLUG
BEFORE OPENING
REFER TO OWNERS MANUAL
NO USER SERVICEABLE PARTS INSIDE
FRONT AND BACK PANEL DESCRIPTION
1. INSTRUMENT INPUT JACK CHANNEL A
This is a standard ¼ inch mono jack socket. This is a high impedance input that can be used
with Piezo pickups on double basses.
2. CLIP/ MUTE INDICATOR
When the amplifier output is clipping, the LED will light up with red. When muted, the LED
will light up with green.

3. INPUT GAIN SWITCH CHANNEL A
High: Higher sensitivity, high impedance input.
Low: Lower sensitivity input setting for guitars with onboard electronics.
Mute: mute the input stage, when switch on, the clip LED will light up with green.
4. INPUT LEVEL SENSITIVITY CHANNEL A
5. LOW BASS EQ CONTROL.
This will adjust the fundamental tones of E and A strings on 4 string basses and B, E & A
on 5 string basses.
6. BASS EQ CONTROL.
This will adjust the fundamental tones of D and G-strings on 4 & 5 string basses.
7. MID RANGE EQ CONTROL.
8. LOW TEBLE EQ CONTROL.
9. HIGH TREBLE (PRESCENCE) EQ CONTROL.
10. COMPRESSOR THRESHOLD LEVEL CONTROL.
This will vary the level the limiter threshold. The compression ratio is 3dB to 1. Adjust this
to suit your playing style and output power of your instrument. The blue LED will light up
when the signal is being compressed. This will vary on how hard the instrument is played and
how the threshold is adjusted.
11. AUX INPUT VOLUME CONTROL
Use to control the level of backing/rhythm track.
12. HEADPHONE OUTPUT JACK
This jack accepts ¼ inch stereo headphone jacks.
13. MASTER VOUME CONTROL.
This is the master volume control and it controls how much power you send to your speakers as
well as the line out socket on the back of the amp. When setting up your tone or plugging in your
instrument, you should keep this control at a low level. All instruments are different when it
comes to how much output is from the pickups. Likewise for players, depending on how hard or
soft you play.
14. INSTRUMENT INPUT JACK CHANNEL B
This is a standard ¼ inch mono jack socket. This is a high impedance input that can be used
with Piezo pickups on double basses.
15. CLIP/ MUTE INDICATOR
When the amplifier output is clipping, the LED will light up with red. When muted, the LED
will light up with green.

16. INPUT GAIN SWITCH CHANNEL A
High: Higher sensitivity, high impedance input.
Low: Lower sensitivity input setting for guitars with onboard electronics.
Mute: mute the input stage, when switch on, the clip LED will light up with green.
17. INPUT LEVEL SENSITIVITY CHANNEL B
18. LOW BASS EQ CONTROL.
This will adjust the fundamental tones of E and A strings on 4 string basses and B, E & A
on 5 string basses.
19. BASS EQ CONTROL.
This will adjust the fundamental tones of D and G-strings on 4 & 5 string basses.
20. MID RANGE EQ CONTROL.
21. LOW TEBLE EQ CONTROL.
22. HIGH TREBLE (PRESCENCE) EQ CONTROL.
23. LIMITER IN/OUT SWITCH.
Sends signal through limiter or bypass.
24. COMPRESSOR INDICATOR.
This blue L.E.D (Light Emitting Diode) will light up when the signal is being compressed.
This will vary on how hard the instrument is played and how the threshold is adjusted.
25. AUX INPUT JACK
Stereo input for Drum machine or I-pod/MP3 player.
26. LINE INPUT.
Input matched to accept high-level outputs from other bass/guitar pre-amps.
This input is a direct feed to the power amp and does not pass through limiter or
EQ sections.
27. POWER ON/OFF SWITCH.
This switches the main power on and off in the amplifier. When you turn on the power, it will
have about 2 seconds delay to protect the speaker.
Do not leave the amplifier plugged into a power source for long periods of time when not in use.
28. AC INPUT -VOLTAGE SELECTOR.
Switches the amplifier to run on either 110-115volt or 220-240volt AC power. Never try to
run the amplifier on a 220-240volt supply when switched to 110-115volt. This can
possibly cause major damage to the amplifier.
29. AC INPUT SOCKET & FUSE.
Connects the amplifier to AC power supply. Always use a grounded plug and make sure

the AC cable is more than 3A rating at 250-volt AC. If you require a longer AC power cord,
we recommend the PJB heavy-duty 20 foot power cords. These are available as an
accessory. If fuse needs replacing, use a slow blow ¾ inch fuse.
30. BALANCED LINE OUT.
This is an ultra-low impedance (200Ω) balanced line out for use with recording or PA mixing
consoles. This output is not controlled by the volume control. Changing the level on your
instrument will however, vary the DI output.
31. GROUND LIFT SWITCH.
This allows the grounding of balanced out socket to be disconnected. This is useful if you are
experiencing hum caused by grounding loops/problems.
32. TUNER OUT
Connect to instrument tuner. This output can also be used as an additional line out.
33. PRE-AMP OUT.
Can be used for driving a second amplifier.
34. FX SEND SOCKET.
Connect the FX send to auxiliary FX unit input.
35. FX RETURN SOCKET HIGH.
Connect the FX Return to auxiliary FX unit output.
36. LOUDSPEAKER OUTPUTS (NEUTRIK SPEAKON CONNECTORS).
The D-600 amplifier will work on any load from 16Ωdown to 2Ω, which is the safe maximum
load for this amplifier. The ‘Speakon’ sockets are in parallel so connecting two 8Ωspeakers
will result in a 4Ωtotal load. We recommend that you use PJB high current speaker cables:
which are dedicated high-current, low-resistance cables. Using inferior cables will greatly
impair the performance of your system.
Just to avoid any confusion, a speaker that has a low impedance has a greater load on the
amplifier. So a maximum load refers to a minimum speaker impedance as more current is
flowing through the amplifier’s output stage, speaker cables and cabinets.

OPERATION & POSITIONING
TURN THE VOLUME DOWN on the D-600 before plugging in your instrument.
Connect the speaker or speakers to the D-600. For best results with this amplifier you should
use PJB loudspeaker cabinets and PJB cables.
ALWAYS USE A HIGH QUALITY GROUNDED AC POWER CABLE. NEVER
USE THIS AMPLIFIER WITH THE GROUND CONNECTION REMOVED. We
recommend you use PJB cables for speaker connections as they have virtually no loss
so there is maximum transfer of power from amplifier to speaker.
Setting Up the Limiter
Although a limiter is not essential to bass amplification, it can be a useful tool in smoothing out
the character of your instrument or playing style. The D-600 limiter has a preset compression
ratio of 3 to 1. For each additional increase of 3dB above the set threshold, the increase in level
is actually 1dB. So the dynamic range of your instrument is reduced.
First set up the limiter by having the compression control (10) set fully clockwise. Now switch
on the limiter (23). Start playing and turn control (10) counter-clockwise. You will see the blue
light start to come on and that is the indication that the limiter is now working. Set this control to
suit your taste.
TRANSPORTING AND STORING THE D-600
When transporting or storing the D-600, it is recommended that you always use the gig bag
provided. That will ensure that you amp has the best protection from dust and will stay looking
like new.
When Storing:
•Keep in a dry location preferably at room temperature in the gig bag.
•Do not store in temperatures below -20 Degrees C or above 40 Degrees C.
•Do not allow it to get wet. If this occurs, never turn it on in this condition.
•Do not leave the D-600 permanently connected to a power source.

SPECIFICATIONS
Amplifier
PJB 600watt, D class amplifier with digital switch mode power supply.
Frequency Response
30Hz -25KHz
Signal to Noise Ratio
Better than 90 dB (EQ off, Volume on Full.)
Impedance
High Input: >4MΩ/22pF
Low Input: >100KΩ/22pF
Line Input: >75KΩ
Pre Amp Line Out: < 2KΩ
Bal. Out: <200Ω
Levels
High Input: 10mV-2.5V
Low Input: 20mV-5V
Pre Amp Out: 1.2V
FX send: 1V
Bal. Line Out: Typical 500mV
Compressor / Limiter
Gain: 0dB
Compression Ratio: 3dB: 1dB
EQ CENTER FREQUENCIES
50Hz, 160Hz, 630Hz, 2.5KHz, 12KHz at +/- 18dB
Included Parts
6 ft AC Power Cord.
Padded gig bag with shoulder strap.

SERVICE/WARRANTY INFORMATION
IN USA
The D-600 has a limited warranty period of 2 years, starting from the date of purchase. The
buyer must complete and return the enclosed warranty card within 14 days of purchase.
In other countries
Please contact the local distributor as other warrantee terms may apply.
This warranty covers defect in materials or workmanship that occurs in normal use. Within
warranty period PJB will repair or replace the defect unit free of labor and parts charge. It is the
buyer’s responsibility to use the unit strictly according to instructions written in this manual
and amplifier manual.
This warranty is not transferable; it is provided to original owner only. Damage/defects
caused by the following conditions are not covered by this warranty:
•Improper handling, neglect or failure to operate the unit in compliance with the
instructions given in user manual;
•Connection or operation of the speakers in any way that does not comply with the technical
or safely regulations applicable in the country where the product is used;
•Repairs or modifications by anyone other than authorized PJB service agent;
•Damages/defects caused by force majeure or any other condition that is beyond the
control of PJB.
Should you need any warranty service, please bring the D-600 back to the dealer from whom
you purchased, along with your sales receipt. Depending on the complexity of the repair work,
your dealer may return the defect unit to PJB service center for repair or replacement.
Phil Jones Bass
American Acoustic Development LLC
8559 Page Avenue
St. Louis, MO 63114 USA
Phone: [phone]
Fax: [phone]
www.philjonespuresound.com
[email protected]
Phil Jones Bass is a division of American Acoustic Development LLC.
www.aadsound.com