Page 1
SESSION 77
OWNER’S MANUAL
Page 2
T h a n k y o u f o r p u r c h a s i n g t h e P J B S E S S I O N 7 7 .
P h i l J o n e s B a s s h a s b e e n b u i l d i n g ba s s a m p l i f i e r s f o r t h e mo s t d e m a n d i n g o f
b a s s i s t s . Ph i l t h o u g h t it w a s ab o u t tim e th a t a b a s s am p th a t d e l i v e r e d the
t r u e to n e o f a ba s s i n s t r u m e n t , li k e yo u ha v e n e v e r he a r d be f o r e w i t h on e
m a j o r diff e r e n c e . I t wou l d be t h e mos t a f f o r d a b l e b a s s a m p y e t . We lo o k e d
i n t o th e mo s t e f f i c i e n t wa y we cou l d bui l d a n am p w i t h o u t sa c r i f i c i n g the
m o s t im p o r t a n t a s p e c t : TON E !
I t i s l o u d e n o u g h t o w o r k w i t h m o s t dr u m m e r s a n d c o m p a c t e n o u g h t o b e
u s e d an y w h e r e .
T h e t w o s u p e r h i g h - e f f i c i e n c y a n d p r o p r i e t a r y 7 - i n c h s p e a k e r s w e r e
d e s i g n e d by P h i l Jo n e s to g e t the mos t of t h e 100 wat t s c l a s s D a m p l i f i e r .
T h e s e 2 a m a z i n g w o o f e r s a r e c o m p l i m e n t e d b y o u r h i g h e n e r g y 3 - i n c h K
h i g h f r e q u e n c y t r a n s d u c e r. We h a v e u s e d t h i s s p e a k e r i n t h o u s a n d s o f PA
s p e a k e r s a n d h a v e p r o v e n t o b e b l o w o u t p r o o f . T h e r e s p o n s e o f t h i s s p e a k e r
s y s t e m i s o f t h e h i g h e s t f i d e l i t y f r o m 3 0 H z t o 2 0 K H z a n d t h a t m e a n s i t d o e s
n o t o n l y so u n d gre a t w i t h bas s bu t an y in s t r u m e n t th a t p l u g s i n t o it.
T h e s e s s i o n 7 7 i s a s i n g l e c h a n n e l , b a s s a m p l i f i e r , 1 0 0 w a t t s o u t p u t . B y
u s i n g a l l d i g i t a l c i r c u i t r y t h e a m p w i l l w o r k o n a n y AC v o l t a g e f r o m 1 0 0 t o
2 6 0 Vo l t s wi t h o u t th e n e e d o f a sel e c t o r. Dig i t a l c i r c u i t s ar e f a r m o r e
e f f i c i e n t t h a t t h e old a n a l o g c o u n t e r p a r t s a n d t h e b e n e f i t i s l e s s w a s t e d
p o w e r a s he a t , th u s g i v i n g th e am p a g r e a t e r lo n g e v i t y. He a t i s an a m p l i f i e r ' s
w o r s t e n e m y si n c e it s l o w l y kil l s e l e c t r o n i c c o m p o n e n t s .
We d i d n o t sk i m p o n q u a l i t y of p a r t s e i t h e r ; we j u s t r e d u c e d d o w n t o t h e
b a s i c n e e d s o f m o s t b a s s p l a y e r s . To e n s u r e l o n g e v i t y w e e q u i p p e d t h i s a m p
w i t h a sol i d ki c k p r o o f ac o u s t i c a l l y tr a n s p a r e n t , c u r v e d st e e l g r i l l . Thi s a m p
u s e s t h e s a m e l e v e l o f q u a l i t y p a r t s f o u n d o n a l l P J B a m p s . O u r g o a l w a s t o
g e t t h e b e s t so u n d i n g , m o s t re l i a b l e am p at a n un b e a t a b l e pr i c e .
1
Page 3
READ THIS FIRST
Before using the SESSION 77 please read ALL the instructions.
On receipt of product, check for any signs of physical damage arising from
shipping. If any damage is visible contact your dealer.
Do not install this equipment in a confined or building-in space such as a
book case or similar unit, and remain a well ventilation conditions at open
site. The ventilation should not be impeded by covering the ventilation
openings with items such as newspaper, table-cloths, curtains etc.
WARNING: Only use attachments/accessories specified or provided by the
manufacturer (such as the exclusive supply adapter etc).
WARNING: Please refer the information on exterior bottom enclosure for
electrical and safety information before installing or operating the
apparatus.
WARNING: To reduce the risk of fire or electric shock, do not expose this
apparatus to rain or moisture. The apparatus shall not be exposed to
dripping or splashing and that objects filled with liquids, such as vases,
shall not be placed on apparatus.
WARNING: The appliance coupler is used as disconnect device, the
disconnect device shall remain readily operable.
When not in use and during movement, please take care of the power
cordset, e.g. tie up the power cordset with cable tie or something like that.
It shall be free from sharp edges and the like that can cause abrasion of the
power cordset. When put into use again, please make sure the power
cordset being not damaged, If any damages found, please look for the
service person to replace the power cordset specified by the manufacturer
or have the same characteristics as the original one.
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. To return your used device, please
use the return and collection systems or contact the retailer where the
product was purchased. They can take this product for environmental safe
recycling.
2
Page 4
FRONT PANEL PANEL OVERVIEW
AUX I NPUT
HEA DPHON E
PHI L JO NES BASS
INP UT
CLIP
INP UT LEVEL BAS S MID TRE BLE
MUTE
LOW
HIGH
0 0 0
MAXMIN
+18d B-18d B+18d B-18d B-18d B +18d B
MAS TER VOL .
MIN MAX
LEV EL
MIN M AX
LIN E OUT
SESSION 77
1 2 3
4 5
6
7
8
9 1 0
11 12 13
FRONT PANEL DESCRIPTION
1. BASS INSTRUMENT INPUT JACK.
This is a standard ¼ inch mono jack socket.
For the best possible sound we recommend you use the PJB BI-12 instrument cable as it
has very low self-capacitance and absolute shielding resulting in greater transparency of
sound and less noise.
POW ER
OFF
ON
14
2. LED CLIP/MUTE INDICATOR.
When the amplifier output is clipping, the LED will light up with red. When the amplifier
muted, the LED will light up with green
3. INPUT /MUTE SWITCH.
Top Position: Mute On
Middle Position: Low sensitivity for mainly active basses.
Bottom position: High sensitivity for passive basses.
4. INPUT LEVEL ADJUSTMENT.
Different instruments and also different playing styles and even players will affect the
signal level so adjust this control so that the signal overload Clip light does not light up.
This optimizes the best signal to noise ratio between amp and instrument and will give
you the full extent of the amplifiers tone and power.
3
Page 5
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Page 6
12. HEADPHONE SOCKET (STEREO PHONES).
We recommend the PJB H-850 headphones as they were designed for bass and high fidelity
music reproduction. They are a perfect match to the SESSION 77
When a headphone is connected to the jack, the speaker output will be disconnected and
the speakers will be muted.
13. POWER SWITCH.
This switches off the amplifier from the DC supply but AC signal will still be in the
internal supply. We advise that you disconnect the power supply from AC source if you
do not intend to use the unit for long periods of time.
14. POWER INDICATOR.
Will light up when you have DC supply connected and amp switched on.
5
Page 7
OPERATION & POSITIONING
TURN THE VOLUME DOWN or switch the Mute on the SESSION 77 before plugging
in your instrument.
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.
Loudspeakers also vary in efficiency with frequency. Most loudspeakers are generally
louder in the mid range than in the bass or extreme high frequencies: Which is one reason
why we need EQ in am amplifier. An EQ control is just a frequency selective volume
control: It boosts or cuts level at a specific frequency. So excessive boosting of
frequencies, especially on bass frequencies where almost 90% of the amplifier power is
used can rob a bass system of headroom.
Amp positioning and EQ
Nearly all bass speakers are Omni-directional at all the fundamental tones of a bass: that
is from about 200Hz (that's the fundamental of a G string on 12 Fret) all the way down to
the lowest frequency a speaker can reproduce. The open E is 41.2Hz and open B string is
31Hz.
Mid range and high frequencies tend to be directional which is why many players angle
their cabinets to ear level so they can hear the definition better.
Because bass frequencies radiate all around the cabinet, the bass will sound weaker when
the cabinet is placed on a large stage with no boundaries. By placing the speakers close to
a wall or even to a corner, the bass frequencies will appear to be much stronger and it may
not need to have much boost on EQ allowing the amp to have more headroom.
By careful positioning of your bass speakers, you may be able to get a fuller low
frequency without the use of boosting too much EQ. This will give not only your amp
more headroom but will put less stress on your speakers.
Keeping the cabinet on the floor will give deeper bass than if it is placed on a stand or
chair as the floor reinforces the low frequencies.
th
TRANSPORTING AND STORING THE SESSION 77
When transporting or storing the SESSION 77, it is recommended that you always use the
optional cover (not included). A dedicated cover can be purchased separately.
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 SESSION 77 permanently connected to a power source.
6
Page 8
SPECIFICATIONS
Amplifier
100 watt D class amplifier with digital switch mode power supply.
Frequency Response
30Hz -20KHz
Signal to Noise Ratio
Better than 84dB (EQ center, Volume on Full.)
Impedance
High Input: >500KΩ/22pF Low
Input: >30KΩ/22pF
Pre Amp Line Out: < 2KΩ
Levels
High Input: 30mV-2V
Low Input: 50mV-1.5V
Pre Amp Out: 1.2V
VENTED ENCLOSURE
2 x7 inch PJB Ferrite Speakers + 1 x PJB 3 inch Tweeter.
Crossover Frequency 4KHZ@ 6dB/Octave
Weight: 27.5lbs
Dimensions: 17inches wide x 11.5 inches high x 14.3inches deep.
Included Parts
6 ft AC Power Cord.
7
Page 9
SERVICE/WARRANTY INFORMATION
PJB amplifiers carry a 2 years limited warranty on parts and labor.
Products must be purchased from an authorized PJB dealer.
Buyer must complete and return the enclosed warranty card within 15 days of
purchase, or register online by
This warranty covers defect in materials or workmanship that occurs in normal use.
Within warranty period PJB or its local distributor 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 the owner’s 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 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.
www.philjonespuresound.com/support/register
IMPORTANT:
•
In all warranty issues your first line of communication should be to the retailer you
purchased from, even if you have purchased product from an online source.
•
When a local distributor is available, customer who prefers to purchase across
country online maybe required to pay shipping charges to retailer in order to
obtain service.
Further questions, please contact PJB by email info@philjonespuresound.com, or
call 314-814-3383.
IN USA
American Acoustic Development LLC
8509 Mid County Industrial Drive, St.Louis MO 63114 USA
Tel: Sales-314 814 3383; Service/Repairs-314 814 1264
Fax: 656 536 1338
www.pjbworld.com
support@philjonespuresound.com
For servicing outside USA please contact our distributor in your country.
Information can be found on our website.
8
Page 10
PH IL JONES BASS
8509 Mid County Industrial Dr / St Louis,
MO 63114 USA
Phone: 314-814-3383
Fax: 636-536-1338
www.pjbworld.com
Pr in te d in China
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