PULSE+ SPA300 User manual

User Instructions
PULSE SPA300, SPA600, SPA900
Power Amplifiers
www.pulse-audio.co.u

SAVE THESE INSTRUCTIONS!!
Unpacking and Inspection
Unpacking and Inspection Unpacking and Inspection
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 appro ed packaging.
INTRODUCTION
INTRODUCTION INTRODUCTION
INTRODUCTION
The PULSE series of amplifiers are fully featured rack mount professional power amps, designed
to pro ide high quality, reliable performance for all professional applications from li e bands to
club installations.
MAIN FEATURES
MAIN FEATURES MAIN FEATURES
MAIN FEATURES
2 Channel stereo power amplifiers which are fan cooled and feature stereo/bridge mode,
softstart, short circuit protection and switchable limiter. The amplifiers are 19" rack mountable &
ha e remo able rubber feet for both mobile or fixed use.
• A ailable in 300W, 600W & 900W
• Detented rotary olume controls
• Protection, clip, signal, bridge & power LED indicators
• Stereo/Bridge mode
• Short circuit and thermal protection
• Ground/Lift switch
• Rugged steel enclosures with front & rear rack mount ears
• Signal Inputs: 2x Balanced XLR & 2x phono
• Signal Outputs: 2x Balanced XLR
• Speaker Outputs: 3x Speakon (1x bridge mode) & 2 pair binding posts

INSTALLATION GUIDELINES
INSTALLATION GUIDELINES INSTALLATION GUIDELINES
INSTALLATION GUIDELINES
• Do not use these amplifiers in damp or high humidity en ironments. Do not use outdoors or
anywhere where liquids could fall or splash onto the amplifier.
• Ensure the amp is adequately entilated, 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 co er the amplifiers, as they may o erheat.
• 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 adhesi e to pre ent 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 dri e etc). Power
amplifiers produce an electromagnetic field, which could affect stored files.
Wiring Conventions in
Wiring Conventions in Wiring Conventions in
Wiring Conventions in ULSE ower Amplifiers
ULSE ower AmplifiersULSE ower Amplifiers
ULSE ower Amplifiers
Phono/RCA (unbalanced); Tip=Signal Positi e. Slee e=Signal Ground.
XLR (balanced); Pin1=Signal Ground, Pin2=Signal Positi e, Pin3=Signal Negati e.
Speakon ; 1+=Speaker Positi e. 1-=Speaker Negati e.

1) Air entilation slots – DO NOT BLOCK
2) Channel B speaker output ia SPEAKON™ socket. Use 1+1- terminals only, minimum
speaker impedance 4Ω
3) Bridge Mono speaker output ia SPEAKON™ socket. Use 1+1- terminals only,
minimum speaker impedance 8Ω
4) Channel A speaker output ia SPEAKON™ socket. Use 1+1- terminals only, minimum
speaker impedance 4Ω
5) Balanced XLR signal link output
6) Unbalanced phono (RCA) signal input connections
7) Balanced XLR signal input
8) Mode selection switch – this selects either BRIDGE MONO or STEREO operation.
In BRIDGE MONO the amplifier works as one signal channel ideal for dri ing 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
amplifier.
In STEREO mode the amplifier will operate as two independent channels – both Channel A
and Channel B
9) Limiter – this will help protect your amplifier and speakers against input signals that are
too high. When the limiter function is switched on and the input signal too high the
amplifier will automatically reduce the input gain. This is as safety feature and does not
permit misuse or abuse of the amplifier.
10) Ground Lift Switch – some equipment may present a mains hum/buzz, this switch will
remo e the signal ground and reduce the effect of the mains hum..
11)
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 oltages, care

should be taken to ensure no bare wires can be touched as this may result in electric
shock.
12) IEC Mains Inlet – Use only the supplied power cord or suitable replacement with the
correct fuse.
13) Mains Inlet Fuse – Replace only with the same rating as originally supplied. If the fuse
fails do not replace with a higher alue.
Compliance
Compliance Compliance
Compliance
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 www.recycle-
more.co.uk for details of how to dispose of PULSE products in an en ironmentally sound fashion, or
contact PULSE directly ia www.pulse-audio.co.uk
Amplifier care bullet points.
Amplifier care bullet points. Amplifier care bullet points.
Amplifier care bullet points.
DO
DO DO
DO …
……
…
1. Read the manual; understand the operation, limitations and safety instructions before using
the product
2. Use good quality cables of the correct type, in the correct sockets. Speaker cables should
be manufactured from 1.5mm
2
or larger cable. Keep speaker lengths as short as possible to
minimise signal loss.
3. Listen to your sound; if it’s distorted, reduce gain, olume or both
4. Use adequate amplification and speakers for your needs
5. Checks the mains supply in the enue; use a mains checker.
6. Ensure your amp, speakers and all cables are free from damage
7. Protect your amp from moisture, smoke/fog machines and glitter cannons
8. Make and check all connections before you switch on
9. Set amp olume to ‘0’ at switch on. Slowly turn up, checking all speakers are working. If
there are problems turn the amp off and resol e them
F
FF
FOLLOW THE SIGNAL ATH!
OLLOW THE SIGNAL ATH! OLLOW THE SIGNAL ATH!
OLLOW THE SIGNAL ATH!
• 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).

DO NOT
DO NOT DO NOT
DO NOT …
……
…
1. Pre ent airflow to your amp; entilation is required front and rear
2. ‘Daisy chain’ speakers. Run a maximum of 1x4Ω speaker or 2x8Ω speaker per amplifier
channel.
3. Run amplifiers with the clip or limit lights on constantly
4. Send a clipped or o erdri en signal from your mixer or source to the amp
5. Store your amp or speakers in a damp en ironment
6. O erload mains sockets; Ne er run more than 3000W of amplifiers, lights or other
electronic equipment from one mains outlet socket.
7. Connect 2 amp channels, or 2 different amps to one speaker
8. Short circuit or cross-connect an amps inputs or outputs
9. The front panel has both SIGNAL and CLIP LED indicators
The front panel has both SIGNAL and CLIP LED indicators The front panel has both SIGNAL and CLIP LED indicators
The front panel has both SIGNAL and CLIP LED indicators –
––
– if the CLIP LED’s illuminate
if the CLIP LED’s illuminate if the CLIP LED’s illuminate
if the CLIP LED’s illuminate
reduce the input si nal to the amplifier immediately. A clipped si nal
reduce the input si nal to the amplifier immediately. A clipped si nal reduce the input si nal to the amplifier immediately. A clipped si nal
reduce the input si nal to the amplifier immediately. A clipped si nal within the audio si nal
within the audio si nal within the audio si nal
within the audio si nal
chain can dama e both speakers and amplifiers.
chain can dama e both speakers and amplifiers.chain can dama e both speakers and amplifiers.
chain can dama e both speakers and amplifiers.
IMPORTANT SAFETY INSTRUCTIONS
INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK OR INJURY
INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK OR INJURY INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK OR INJURY
INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK OR INJURY
TO PERSONS
TO PERSONS TO PERSONS
TO PERSONS
WARNING - Using electric product, basic precautions should always be followed, including the
following:
1. Read all the SAFETY INSTRUCTIONS before using the product.
2. To reduce the risk of injury, close super ision 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 le els that could cause permanent hearing loss. DO
NOT operate for a long period of time at high olume or at a le el 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
entilation.
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 con ention is used in all product mains leads, and
must be strictly obser ed: Green & Yellow = Earth. Brown = Li e. Blue = Neutral. IMPORTANT: THIS
UNIT MUST BE EARTHED!

8. If the mains fuse need replacing, DISCONNECT THE PRODUCT FROM THE MAINS SUPPLY.
The fuse is abo e 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 ser ice agent. DO
NOT replace with a higher alue.
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 ser iced by qualified ser ice personnel when:
A. The power-supply cord or the plug has been damaged; or
B. Object ha e 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 ser ice the product beyond that described in the user-maintenance
instructions. All other ser icing should be referred to qualified ser ice personnel.
15. WARNING -DO NOT place objects on the product’s power cord or place it in a position where
anyone could trip o er, walk on or roll anything o er it. DO NOT allow the product to rest on or to be
installed o er power cords of any type. Improper installations of this type create the possibility of fire
hazard and/or personal injury.
IF YOUR AMP STOPS WORKING ;
IF YOUR AMP STOPS WORKING ; IF YOUR AMP STOPS WORKING ;
IF YOUR AMP STOPS WORKING ;
• READ THE MANUAL !!!
• Turn olume 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 ser ice agent

Service
Service Service
Service
All PULSE products are thoroughly examined and tested before lea ing the factory, and if used
correctly will gi e many years of excellent ser ice. Howe er, 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 ser iceable parts. For details of spares, accessories and other
products, contact you local retailer. In the e ent of any difficulty contact PULSE directly
ia www.pulse-audio.co.uk