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SPA SERIES
STEREO POWER AMPLIFIER
Offering top power, superior performance and full professional
operating features in a roadworthy compact chassis, the SPA
Series are perfect for even the most demanding sound
reinforcement installation and touring applications.
The operating instruction in this manual are for the SPA 850,
SPA 1400 and SPA 2400 power amplifiers. The operation and
functions of these units are the same, except as noted.
• Continuously variable speed fan with back-to-front air flow
• Full operating features: user-defeatable clip limiter; switchable
30Hz low-cut filter; balanced XLR and 1/4” TRS inputs; detent
volume controls; stereo (dual-channel, parallel-input, or bridged
mono operating models with selector switch; binding post and
Neutrik Speakon™ outputs; ground-lift switch
• Complete, advanced safety/reliability features: soft-start turn on;
noise-free on-off; built-in DC offset; independent DC and
thermal overload protection on each channel; short circuit and
speaker protection; DC servo operation; built-in current limiter
• Parallel outputs allow “daisy chaining” amps
• ~115V (60Hz)/~230V (50Hz) AC select switch
• Clip and Signal LED indicators for each channel
• Durable double rack space (2U) steel casing
• SPA 850 — 2 x 350W @4Ω, 2 x 425W @2Ω
Bridge mono: 600W @ 8Ω, 850W @ 4Ω
SPA 1400 — 2 x 500W @4Ω, 2 x 800W @2Ω
Bridge mono: 1000W @ 8Ω, 1400W @ 4Ω
SPA 2400 — 2 x 750W @4Ω, 2 x 1400W @2Ω
Bridge mono: 1600W @ 8Ω, 2400W @ 4Ω
Congratulations on your choice of stereo power amplifiers —
you have purchased one of the finest stereo amplifiers on the
market today. This unit was developed using the expertise of
professional sound engineers and working musicians. You will
find that your new NADY AUDIO SPA 850/1400/2400 has
superior performance and greater flexibility than any other
amplifiers in its price range. Please read this manual carefully
to get the most out of your new unit.
Thanks for selecting NADY AUDIO as your choice in
amplifiers.
Date of Purchase __________________________________________
Dealer’s Name ____________________________________________
City______________________________________________________
State____________________Zip ______________________________
Model # __________________________________________________
Serial # __________________________________________________
FEATURES ..................................................................3
WARNING....................................................................4
FRONT AND REAR CONTROLS ................................5
INSTALLATION ............................................................7
CONNECTIONS ..........................................................8
BLOCK DIAGRAM ......................................................10
SPECIFICATIONS ......................................................11
FEATURES
CONTENTS
3