User manual NADY SPA 1400

[. . . ] This product should be used only with a cart or stand that will keep it level and stable and prevent wobbling. This product, in combination with headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an audiologist. [. . . ] AC VOLTAGE SELECTOR SWITCH: Before plugging in the power cord, check to see that the unit is set for the proper voltage for your area: ~115V (60Hz) or ~230V (50Hz). A cover plate is provided to ensure that this switch is not accidently reset or tampered with between uses. L/R CHANNEL OUTPUT CONNECTORS (SpeakonTM & Binding Posts) The SpeakonTM and binding post (banana jack) outputs are compatible with a speaker load of 2 or greater (4 or greater for bridged operation). Connections are as depicted on the rear panel and in the following CONNECTIONS section on page 8 of this manual. FRONT AND REAR CONTROLS 11. BALANCED INPUT CONNECTORS (1/4" TRS & XLR) These 1/4" (6. 3mm) TRS (Tip/Ring/Sleeve) phone jacks and XLR jacks are compatible with balanced inputs and are wired as Tip/Pin 3 = (+), Ring/Pin 2 = (-), and Sleeve/Pin 1 = Ground. Normal maximum input level at clipping is 1. 15V RMS (+ 4dB). Since the TRS phone jacks and XLR jacks are wired internally in parallel, you can parallel this unit with another amplifier by using either the LINE 1/4" jack or the XLR jack (depending on which you're using to input your signal) to output the signal to the input jack of the other amplifier. The 1/4" TRS phone jacks can also be used for unbalanced inputs. For TRS phone plugs, simply connect the unused side of the balanced input to ground. For 1/4" TS phone plugs, no change is necessary for compatibility with this input. Balanced input signals are recommended as they are less prone to AC hum. For long cable runs a source of less than 600 ohms output impedance is needed to avoid signal loss. For short cable runs an unbalanced signal input should be suitable. For stereo (two-channel) operation, use the inputs for both CH-A and CH-B; for parallel or bridged mono operation, use only CH-A input. (See 13-MODE SELECTOR SWITCHES below for more explanation. ) 12. CLIP LIMITER SWITCH This switches the internal Clip Limiter ON or OFF for both channels. The limiter prevents excessive signals from overloading the amplifier (and thus flattening the peaks of the waveform and introducing distortion) by automatically lowering the amplifier gain to minimize overdrive. This limiting is primarily used to protect full-range speakers from high frequency distortion or damage to the horns caused by bass overdrive. However, when driving a subwoofer, defeating the limiter can produce a desired extra "punch" to bass instruments, such as kick drums. MODE SELECTOR SWITCH The SPA Series amplifiers offer 3 modes of operation: PARALLEL, STEREO & BRIDGED. Slide the switch to one of the three positions for you application. · PARALLEL (MONO) INPUT -- This mode allows both channels to operate in parallel with the same signal and without requiring a Y-cord. [. . . ] Ch A Pin2+ = ChB Pin1+ and Ch A Pin2- = Ch B Pin1-) · Bridged Mono Mode To put the amplifier in bridged mono mode, turn the amplifier off and slide the mode selector switch (13) toward the right "BRIDGED" position and properly connect the input/output wiring as shown. Keep the level control of channel "B" turned completely down (counter clock wise). (Note: Do not connect a speaker load of less than 4 ohms as it can damage your amplifier. ) (Note: This mode produces a large amount of power. Be sure that your wiring and speaker can handle it. ) Do Not Use CHANNEL A Do Not Use This SpeakonTM for Bridge Mode CHANNEL A PIN 1+ PIN 2+ + - 9 BLOCK DIAGRAM 10 SPECIFICATIONS POWER SPECIFICATIONS 2 EIA out power 1Hz, THD maximum 1% Both channels 4 8 Bridged 8 4 SPA 850 425 350 + 350 200 + 200 600 850 SPA 1400 800 500 + 500 300 + 300 1000 1400 SPA 2400 1400 750 + 750 500 + 500 1600W 2400 ELECTRICAL SPECIFICATIONS INPUT SENSITIVITY INPUT IMPEDANCE FREQUENCY RESPONSE (at 10dB below rated output power VOLTAGE GAIN DISTORTION (SMPTE-1M) S/N ratio SPA 850 1. 15V (+3. 4dBU) SPA 1400 1. 15V (+3. 4dBU) SPA 2400 1. 15V (+4dBU) 10K Unbalanced & Balanced 25Hz~25KHz +0/-1dB -3dB points: 5Hz~50KHz 30dB <0. 03% 100dB 32dB <0. 03% 100dB 34dB <0. 03% 100dB GENERAL SPECIFICATIONS PROTECTIONS SPA 850 SPA 1400 SPA 2400 Full short circuit, open circuit, thermal, ultrasonic, and RF protection; stable into reactive or mismatched loads; ON/OFF muting; current limiter (crowbar) Front: Power switch, 40 detent input level control for each CONTROLS channel. [. . . ]