Acoustic 136 User manual

INSTRUCTION MANUAL
ACOUSTIC MODEL 136 BASS AMPLIFIER
P/N 410059

INSTRUCTION MANUAL FOR ACOUSTIC
MODEL 136 BASS AMPLIFIER
Thank you for giving us this opportunity to acquaint you with the various features of vour
new ACOUSTIC 136 BASS Amolifier.
Your ACOUSTIC 136 was designed to meet the highest standards of excellence and perform-
ance under the most demanding and exacting playing conditions.
The name ACOUSTIC on your 136 amplifier is synonymous with the ultimate in professional
amplification. Your ACOUSTIC 136 is the standard by which all others are judged.
LIFETIME GUARANTEE
ACOUSTIC Control Corporation guarantees its products to the original purchaser to be free
from defects in materials and workmanship:
1. Provided the Warrantee Reqistration Card ls completed and mailed to ACOUSTIC within
+en days (10) from the date of purchase.
2. Provided the purchaser delivers the product to an authorizecl ACOUSTIC Service Center
for repair
3. Provided the product has not been misused or mishandled.
Once the rroduct has been delivered to the Service Center, all repairs of any defects will be made
free of any charge to the original purchaser.
+Warrantee may vary on export models depending on country of purchase. Check with dealer
where purchased as to terms and extent of warrantee.
P/N 410059

SPECIFICATIONS
136 E lectronics
Preamplifier Gain x80 (hiqh gain input)
Signal-to-noise Ratio . 80db
Minimum Input Voltage For Rated Output 21mv
Maximum Input Voltage . 1.16 Volts
Power gLllput Measured Across 3.2 Ohm Load 110 Watts (RMS)
Rated output on export models is measured at24Ov at 60 cycles. Using any lower source will
result in a slight power loss, but will not damage the unit in any way.
Booster Output Voltage At 100 Watts . 230mv
Channels .......2
fnputs Per Channel 2 (1 14" phone jacks)
Gain Difference Between Inputs . . 10db
120 Volt AC Outlet* . . . 1
*Export Models have a 240v AC convenience outlet
r use 3 Amp Slo-Blo Fuse at 125V (3AG)
"Export models nave a
Corrtrols Channel A
1.5 amp slo-blo fuse at 250v (3ab).
Briqht/Normal Switch
Rotary Potentiometer
Rotary Potentiometer
RotarV Potentiometer
Rocker Type
Rocker Type
Volume
Treble
Controls Channel B
Bright/Normal Switch
Bass
Volume
Treble
Rotary Potentiometer
Rotary Potentiometer
Rotary Potentiometer
Bass
P/N 41005St

Power Section Controls
Ground Reverse (GND)
Power On/Off (PWR)
Rocker Type
Rocker Type
1 Neon Lamp
Domestic models are designed for operation at 12O volts 60H2.
Export models are designed for operation at 24O volts 50/60H2
1 36 Speaker Cabinet Specifications
Speaker Complement 1 Eminence 15" Soeakers
Cabinet Design . Horn Loaded-Ducted Port
Cabinet Construction . 314" Braced Plywood
Speaker Access SnaP-Off Gr
lndicator
Speaker Mounting (each speaker)
Cabinet Size 23-112" H x
8 Bolts (10-32
32"112" W x 1
ill Frame
Threads)
4-1t2" D
75lbs.
Shipping Weight
P/N 410059

rtoDEt | 36
P/N 410059

f NPUTS (Hish and Low Gain) (U (21
The first input (1) is louder than the second input (2). The first input (1)should be used in
most cases to achieve maximum signal-to-noise ratio; however, if your instrument puts out such a
large signal that you can turn the volume control just a little bit above the off position, then use the
second input (2) to cut down on the signal. There is no difference in tone between the two inputs -
only volume. (No. 2 is 10 DB lower than No. 1.)
BRIGHT SWITCH (3)
In the BRIGHT position, the treble is boosted in relation to the bass and mid-range. lt is most
active at lower volume control settings and decreases in activity as the volume control (4) is
advanced to avoid feedback and oscillations at high volume.
VOLUME (4) (71
The Volume Control (4) increases the volume of all frequencies and special functions equally
with the exception of the Bright Switch (3). (See aborye.)
TREBLE (5) (B)
The treble circuitry is of the cut and boost type. This type of control allows you a great deal
of treble boost, as well as sufficient treble cut for maximum sustain in the mid-range at higher
power levels. Always keep in mind that straight up is flat. Turning the treble control to the left of
center eliminates treble, to the right of center increases treble.
BASS (6) (e)
The Bass Control is also of the cut and boost type. Flat (or normal) is straight up. To the left
of center cuts bass, to the right of center boosts.
GROUND REVERSE (10)
Under some conditions, the ground reverse switch can reduce or eliminate a persistant hum
or click in the strings. Set the switch in whichever position reduces or eliminates the oroblem.
POWER OFF/ON (11)
This turns the whole system on (see hook-up procedure). lf everything is working, there
might be a loud thump when you turn the amp on. DoN'T pANlc. This is normal.
P/N 410059

PILOT LAMP (12)
Lamp to show that pow-.r is on.
AC LINE CORD (13)
All Acoustic amplifiers have a 3 wire grounding plug. This will eliminate any possibility of
shock hazard AS LONG AS ALL OTHER EOUIPMENT lS SIMILARLY GROUNDED. Shock
conditions are caused by different ground potentials betrveen the amplifiers and the P.A. system,
or between the amplifiers and the actual ground (cement floor, dirt, or wet stage, for example).
This voltage difference can be dangerous, and if the ground reverse sr,rritch doesn't eliminate the
shock, DON'T PLAY. Make the stage manager of electrician correct the problem.
FUSE (14)
Keep in mind that a fuse is simply a circuit breaker that operates if a potentially dangerous
situation exists. lf the fuse does blow, always replace it with a 3 Amp Slo-Blo fuse at 125 volts
(3AG).* Do not use any other type or rating.
"Export models have a 1.5 Amp (3AB) Slo-Blo fuse at 250 volts.
AC CONVENTENCE OUTLET (15)*
This outlet will provide AC power for auxiliary equipment. Do not plug equipment into this
outlet if the power demands are higher than the rating marked next to the outlet. The outlet
st:ys on even when the amplifier is off.
*Export models have a 24O volt AC outlet.
SPEAKER JACKS (16 & 17)
When using only one speaker bottom, you may use either speaker jack. All Acoustic speaker
systems have a nominal impedence of 4 ohms. You may use any number of speaker systems as
long as the total impedence is not less than 4 ohms.
P/N 410059

BOOSTER OUTPUT JACK (18)
This jack would be used if you desire to drive an additional power amp and speakers using
the lead to control the extra power amp. The jack may also be used as a recording output to
drive a tape recorder or as an output that will plug directly into a P.A. system to prevent the
possibility of P.A. feedback. The booster output will provide a signal level of 230mv when the
amplifier is putting out about 100 watts. Make sure that 230mv is sufficient for the auxiliary
equipment.
NOTE:
Export models are designed for operation at 240 volts at 50/60 cycles.
P/N 410059

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