User Instructions PULSE SPA1300, SPA2400 Power
User Instructions
PULSE SPA1300, SPA2400
Power Amplifiers
Unpacking and Inspection
Carefully unpack the unit. If it appears damaged in any way, return it to the retailer it was purchased
from in its original packaging. PULSE cannot accept any responsibility for damage arising from the use
of non approved packaging.
The PULSE series of amplifiers are fully featured rack mount professional power amps, designed
to provide high quality, reliable performance for all professional applications from live bands to
club installations.
2 Channel high power stereo amplifiers with SMT technology which give them superior sound and
greater reliability. Feature stereo/bridge mode, softstart, short circuit protection and limiter. The
amplifiers are 19" rack mountable & have removable rubber feet for both mobile & fixed use.
Available in 1300W & 2400W
Detented rotary volume controls
Protection, clip, signal, bridge & power LED indicators
Stereo/Bridge mode
Short circuit and thermal protection
Selectable sensitivity
Ground/Lift switch
Fan cooled
Rugged steel enclosures with front & rear mounting ears
Inputs: Balanced XLR & balanced 6.35mm (1⁄4") jacks
Ì Outputs: 3x Speakon (1x bridge mode) & 2 pair binding posts
Do not use these amplifiers in damp or high humidity environments. Do not use outdoors or
anywhere where liquids could fall or splash onto the amplifier.
Ensure the amp is adequately ventilated, with free airflow to the front and rear panels. Keep
away from other heat sources. If the amps are mounted in a rack with other amps, ensure
there is adequate cool air flow front and rear. Note that air is drawn in through the back
panel, and exhausted through the front panel.
NEVER cover the amplifiers, as they may overheat.
PULSE power amplifiers are designed to fit standard 19” racks, with a 2U height and 17”
depth. We recommend the use of rear rack supports, especially if the rack is to be mobile.
Use shakeproof washers or threadlock adhesive to prevent mounting bolts becoming loose
in transit.
Ensure that the AC power supply is correct for your amplifier. The required AC supply is
stated on the rear panel next to the AC power input.
Ensure that you use the correct type of mains lead for your equipment and country. This
must be free from damage and easily accessible during use.
Keep away from magnetic recording media (tape, mini disc, hard drive etc). Power
amplifiers produce an electromagnetic field, which could affect stored files.
Wiring Conventions in PULSE
PULSE Power Amplifiers
Phono/RCA (unbalanced); Tip=Signal Positive. Sleeve=Signal Ground.
XLR (balanced); Pin1=Signal Ground, Pin2=Signal Positive, Pin3=Signal Negative.
Speakon ; 1+=Speaker Positive. 1-=Speaker Negative.
Air ventilation fans – DO NOT BLOCK
Balanced 6.35mm Jack signal link output
Balanced XLR signal input
Ground Lift Switch – some equipment may present a mains hum/buzz, this switch will
remove the signal ground and reduce the effect of the mains hum.
Mode selection switch – this selects either BRIDGE MONO, PARALLEL or STEREO
In BRIDGE MONO the amplifier works as one signal channel ideal for driving higher power
speakers. This must be used in conjunction with the BRIDGE MONO speaker output, only
one signal input is required (into Channel A), this must be mirrored on the front panel
controls – turn Channel B to the lowest setting and only use Channel A to control the
In PARALLEL mode the amplifier works as two independent channels but couples the input
signal together to allow the use of one input signal while retaining independent volume
controls for each channel output.
In STEREO mode the amplifier will operate as two independent channels – both Channel A
and Channel B
Sensitivity Switch – Selectable input sensitivity allows the user to match the amplifiers
input gain to the output of their mixer or signal processing equipment.
IEC Mains Inlet – Use only the supplied power cord or suitable replacement with the
correct fuse.
Channel B speaker output via SPEAKON™ socket. Use 1+1- terminals only, minimum
speaker impedance 4Ω
Binding post outputs – for certain installations it may be better suited to use the binding
post outputs. As with all speaker wiring care must be taken to ensure no wires can
present a short cirtcuit to the amplifier.
Speaker wires carry high voltages, care
should be taken to ensure no bare wires can be touched as this may result in electric
Channel A speaker output via SPEAKON™ socket. Use 1+1- terminals only, minimum
speaker impedance 4Ω
Bridge Mono speaker output via SPEAKON™ socket. Use 1+1- terminals only,
minimum speaker impedance 8Ω
This equipment is designed to comply with the following standards:
BS EN55103-1:1996 BS EN55103-2:1997 BS EN60065:2002
When this product reaches the end of its life, do not dispose with household waste. See for details of how to dispose of PULSE products in an environmentally sound fashion, or
contact PULSE directly via
Amplifier care bullet points.
DO …
Read the manual; understand the operation, limitations and safety instructions before using
the product
Use good quality cables of the correct type, in the correct sockets. Speaker cables should
be manufactured from 1.5mm2 or larger cable. Keep speaker lengths as short as possible to
minimise signal loss.
Listen to your sound; if it’s distorted, reduce gain, volume or both
Use adequate amplification and speakers for your needs
Checks the mains supply in the venue; use a mains checker.
Ensure your amp, speakers and all cables are free from damage
Protect your amp from moisture, smoke/fog machines and glitter cannons
Make and check all connections before you switch on
Set amp volume to ‘0’ at switch on. Slowly turn up, checking all speakers are working. If
there are problems turn the amp off and resolve them
Source output to mixer/preamp input (shielded signal cable),
Mixer/preamp output to power amp input (shielded signal cable),
Power amp output to speaker input (unshielded speaker cable).
Prevent airflow to your amp; ventilation is required front and rear
‘Daisy chain’ speakers. Run a maximum of 1x4Ω speaker or 2x8Ω speaker per amplifier
Run amplifiers with the clip or limit lights on constantly
Send a clipped or overdriven signal from your mixer or source to the amp
Store your amp or speakers in a damp environment
Overload mains sockets; Never run more than 3000W of amplifiers, lights or other
electronic equipment from one mains outlet socket.
Connect 2 amp channels, or 2 different amps to one speaker
Short circuit or cross-connect an amps inputs or outputs
The front panel has both SIGNAL and CLIP LED indicators – if the CLIP LED’s illuminate
reduce the input signal to the amplifier immediately. A clipped signal within the audio signal
chain can damage both speakers
speakers and amplifiers.
WARNING - Using electric product, basic precautions should always be followed, including the
1. Read all the SAFETY INSTRUCTIONS before using the product.
2. To reduce the risk of injury, close supervision is necessary when the product is used near children.
3. Do not use this product near water -for example, near a bathtub, washbowl, kitchen sink, in a wet
basement or near a swimming pool or the like.
4. This product is capable of producing sound levels that could cause permanent hearing loss. DO
NOT operate for a long period of time at high volume or at a level that is uncomfortable. If you
experience any hearing loss or ringing in the ears, you should consult an audiologist.
5. This product should be located so that its location or position does not interfere with its proper
6. This product should be located away from heat sources such as radiators, heat registers or other
products that produce heat.
7. The product should be connected to a power supply only of the type described on the operating
instructions or as marked on the product. Always ensure that a good quality mains lead is used
applicable for your country. The following wiring convention is used in all product mains leads, and
must be strictly observed: Green & Yellow = Earth. Brown = Live. Blue = Neutral. IMPORTANT: THIS
8. If the mains fuse need replacing, DISCONNECT THE PRODUCT FROM THE MAINS SUPPLY.
The fuse is above the mains IEC socket, and must be replaced with a fuse of the type and rating
stated on the rear panel. If a replacement fuse fails immediately, contact your local service agent. DO
NOT replace with a higher value.
9. The power-supply cord of the product should be unplugged from the outlet when left unused for a
long period of time. When unplugging the power-supply cord, DO NOT pull on the cord, but grasp it by
the plug.
10. Ensure the mains isolation switch is readily accessible when the product is in use.
11. Care should be taken so that objects do not fall and liquids are not spilled into the enclosure
through openings.
12. The product should be serviced by qualified service personnel when:
A. The power-supply cord or the plug has been damaged; or
B. Object have fallen, or liquid has been spilled into the product; or
C. The product has been exposed to rain; or
D. The product does not appear to operate normally or exhibits a marked change in performance; or
E. The product has been dropped or the enclosure damaged.
14. DO NOT attempt to service the product beyond that described in the user-maintenance
instructions. All other servicing should be referred to qualified service personnel.
15. WARNING -DO NOT place objects on the product’s power cord or place it in a position where
anyone could trip over, walk on or roll anything over it. DO NOT allow the product to rest on or to be
installed over power cords of any type. Improper installations of this type create the possibility of fire
hazard and/or personal injury.
Turn volume to zero on both channels
Check all connections (input and output, at both ends of cable)
Check status lights on front panel
Disconnect from mains before changing fuse
Replace fuse only with same type and rating
If problems persist contact a qualified service agent
All PULSE products are thoroughly examined and tested before leaving the factory, and if used
correctly will give many years of excellent service. However, if a problem arises, proceed as follows:
A) Contact the retailer from whom the unit was purchased and describe the symptoms of the fault.
B) If the retailer cannot help, return the equipment to the national distributor for your country. Use the
original packaging to protect the product from damage. Include a note with the equipment stating your
name and address, details of the problem, date code and date and place of purchase.
The unit does not contain any user serviceable parts. For details of spares, accessories and other
products, contact you local retailer. In the event of any difficulty contact PULSE directly
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