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OPERATORS MANUAL
SSA 6
MULTICHANNEL AMPLIFIER
QUICK START
You gots your good habits, and you gots your bad habits. A good habit is to read at least this much of the manual. A bad habit is not to read any of this manual. Reading just this section can prevent grief worse than your worst nightmare. Grief that's hard to get rid of--harder than a bad habit. Be sure the amplifier is off before making any connections. Euroblock speaker connectors make connecting the amplifier easy. They are just like little snap-on terminal blocks that take up to 12 gauge wire. Gold plated RCA connectors take standard unbalanced sources. See Rane Note 110 for more information about other connectors. Keep your input cable lengths as short as possible. Speaker loads should be no less than four ohms per output. If you are running multiple speakers per Channel in series or parallel, check your final impedances. If you are running six separate Channels (unbridged), be sure all the BRIDGED switches on the rear panel are depressed. If you are running any Channels bridged, you are obviously a power user and we highly recommend you read further into the manual regarding this issue. With Input and Output connections completed, be sure all front panel LEVEL controls are all the way counterclockwise. Now flip the POWER switch and after hearing the relays click in after a second, notice that the READY lights come on. Slowly turn up each Channel's LEVEL control to the desired gain and if all is well you should hear something pleasant. If not, re-check connections, put on a better CD, and read more of the manual.
Manual-1
FRONT PANEL DESCRIPTION
1. POWER switch: Obediently turns the SSA 6 on and off every time you poke it with your finger (or other suitable object). All six Channels have delayed turn-on/instant turn-off relays to eliminate any switching transients. 2. THERMAL overload indicator: This red LED lights up if the SSA 6 becomes too hot, indicating that power has been removed from all six Channels. Be sure to check the fan filter and actual speaker impedances if this lights up. 3. POWER indicator: This magnificent blue LED lights whenever the SSA 6 POWER switch is turned on. 4. READY indicators: Each of these green LEDs light whenever the mute relay is passing the signal through to the speaker. Normal operation is the on status. 5. LOAD LIMIT indicators: Each of these red LEDs lights whenever a Channel leaves the Safe Operating Area (SOA). This means the amplifier turned down the Input level quickly and automatically, avoiding over-dissipation. Input signals 30 dB over a safe limit will cause the READY indicator and mute relay to turn off until the amplifier has been turned off and the problem corrected. Normal operation is the off status. 6. PEAK LIMIT indicators: These red LEDs light whenever a Channel's Output cannot follow its Input. The amplifier has turned down the Input level quickly and automatically, avoiding audible distortion. Normal operation is the off status. 7. Channel LEVEL controls: Each of these rotary controls determines the Input sensitivity of each respective Amplifier Channel. At its full clockwise position, an Input signal of 0 dBu (.775 vrms) drives the Amplifier to full power. As the controls are rotated counterclockwise, more Input signal level will be needed to achieve full power.
Manual-2
REAR PANEL DESCRIPTION
1. INPUTS: These are standard unbalanced RCA connectors. For balanced sources consult Rane Note 110. 2. NORMAL/BRIDGED switches: With the switch in the out position and the LED indicator on, the SSA 6 is operating in BRIDGED mode. The SSA 6 utilizes the BRIDGE switch to make internal connections between each pair of Channels: 1&2, 3&4, and 5&6. Whenever a signal is connected to an odd numbered Channel (say channel 1), the next even-numbered Channel is driven inverted when the BRIDGE switch is activated. When the BRIDGE switch is inactive, the internal connection is defeated and both Channels operate independently. Inputs should be connected to Odd Amplifier Channels only (1,3,5), and speakers connected to the "+" terminals of each Channel pair as shown on the SSA 6 chassis silk-screen. 3. OUTPUTS: Connect the speaker(s) to each of the six Channels by means of the Euroblock connectors with 18 to 12 AWG wire (See #2 for Bridged operation). 4. AC line cord: Plug this into a grounded AC outlet of l20VAC (or 240VAC if the SSA 6 is internally wired for 240V operation). NOTE: If you use an adapter to plug the SSA 6 into a non-grounded outlet (three-to-two prong adapter), be sure to screw the ground adapter to the outlet by means of the cover plate screw. 5. Line fuse: Use only a 15 amp 250 volt Fast-blow (or Normal blow--not Slow blow) fuse, 1.25" long, such as Buss ABC-15 (120 volt) or equivalent. For 240 volt use Buss ABC-8 or equivalent. 6. Fan filter: This washable filter may easily be removed for periodic cleaning by gently pulling on the black plastic housing and then lifting it awayperform this feat with the fan off, of course. Once the filter is removed, rinse it under hot tap water; and use dish soap to cut through particularly stubborn pollution deposits. IMPORTANT: Keep this filter clean to ensure proper cooling and reliability of the SSA 6. Never remove the filter with the unit plugged in. The SSA 6 draws a tremendous amount of air to ensure proper cooling and resultant long term reliability. Check and clean the filter as often as necessary, especially if the thermal overload indicator ever comes on.
Manual-3
OPERATING INSTRUCTIONS
Voltage Controlled Attenuators The voltage controlled attenuators (VCAs) in the SSA 6 allow a significant increase in usable volume levels without excessive clipping or interference from conventional distortion causing muting circuits. The VCAs do not affect dynamic response, distortion or noise levels of any material within the rated output specifications of the amplifier. They simply monitor the difference between Input and Output signals, and the power dissipated in the output devices. In the event of clipping or excessive dissipation in the output devices, the VCAs "jump in" (out of hiding, as it were) and turn down the Input level to correct the overdrive condition. This means that whenever a PEAK LIMIT LED flashes, a musical peak has been quickly turned down to avoid excessive clipping. This allows you to run the amplifier at a higher continuous level, typically about 4dB SPL higher than without VCAs. And that 4dB of increased SPL is the equivalent of a 250 watt amplifier without VCAs. If a LOAD LIMIT LED flashes, the Input level has been quickly turned down to prevent over-dissipation in the output devices due to excess phase shift or abnormally low impedances which may occur at some frequencies. This protection occurs without distorting or interrupting the musical program. Keep an eye on the LEDs on the SSA 6 front panel. Occasional flashing of the LIMIT LEDs means you are getting the most SPL out of the amplifier. Continual lighting of either LED indicates excessive input overdrive, or too low impedance of load. If the green READY LED goes off, a load has been encountered that could not be corrected by the VCAs, or the amplifier has offset. If this occurs, the amplifier must be turned off and the problem corrected before the Channel can be operated. If the READY LED will not light with the load disconnected, then an internal fault has occurred and the amplifier is in need of repair. Adapting the SSA 6 to Your Changing Needs With six Channels to choose from and built-in Bridging, there are a number of different combinations available to suit your present and growing needs. The nice thing about the SSA 6 is that you can re-configure it instead of losing money on an obsolete, used piece of gear you no longer need. Basically, you can start out with six Channels at 100 watts or three Channels at 300 watts. When the time comes, you can step up to six Channels at 300 watts by obtaining another SSA 6 and keeping the original. Upgrading to biamped speakers becomes easy as well, by simply adding a second SSA 6, both taking up only 10.5" rack space.
Rack Ears Ears are available as an accessory. The SSA 6RM Rack Mount Kit replaces the side panels to install the SSA 6 in a 19" rack. The SSA 6RM panels replace the side panels on the SSA 6. Because electronics are exposed during this simple procedure, we must issue the following warning...CAUTION: Rack ears should be installed by qualified personnel only. To avoid electric shock do not perform installation unless qualified to do so. Wait ten minutes before removing the side panels for the power supply caps to safely discharge. About the SSA 6 and Circuit Breakers... The SSA 6 will easily deliver over 900 watts of audio power, which requires as much as 15 amps of current from the AC outlet. 15 amps is not an uncommon value for household and some institutional circuitbreakers, though 20-amp versions are becoming more common. The bottom line is that the SSA 6 is capable of tripping a 15 amp circuit breaker under normal operation. An amp that delivers a lot of power, drinks a lot of power to do so. It is not likely that you will trip a breaker, but it is wise to be aware of the possibility so you don't panic if it happens.
İRane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com
All features & specifications subject to change without notice. JUN96
Manual-4
Parameter Power Output
Specification 100 150 300 Active Unbalanced 20k 0.6V input=100W/8 ohms 300:1 No Less Than 4 Ohms No Less Than 8 Ohms Continuous Variable Speed On/Off Transient Muting Servo-Locked Input Atten. 1% THD
Limit Min Min Min 1%
Units W W W Ohms mV
Inputs: ..........Impedance ..........Sensitivity Outputs: ..........Damping Factor ..........Minimum Load Fan Cooling Output Protection Input Protection ..........Peak Limit ..........Load Limit Frequency Response THD+Noise IM Distortion (SMPTE) Signal-to-Noise Ratio Crosstalk Maximum AC Power UL Listed CSA Certified Unit: Construction ..........Size ..........Weight Shipping: Size ..........Weight Note: 0dBu=0.775Vrms
Conditions/Comments All Channels Driven, 20-20kHz (6) 8 Ohm Loads (6) 4 Ohm Loads (3) Bridged Pairs into 8 Ohms Gold Plated RCA Connectors Level Controls at Max 1kHz Single Channel Operation Bridged Operation Intake Rear; Exhaust Front Output Relays Attenuates Input to Maintain <3% THD for 15dB of Overdrive Attenuates Input as much as -30dB to Maintain Safe Power DissapationRelay Cutout Fail-Safe 100W/8 Ohms, 20-20kHz 60Hz/7kHz, 4:1 re 100W, 0.775v sens., 20kHz BW 1kHz, Any Channel to Any Channel (6) Channels driven to full power Complies with UL 813 Complies with C22.2 #1 M90 (13.3cm x 44.1cm x 27.9cm) (14.5kg) (27.9cm x 58.4cm x 40.6cm) (17kg)
10%
DC
10-55kHz 0.07 0.1 103 -60 2200 UL All Steel 5.25"H x 17.4"W x 11"D (3U) 32 lb 11" x 23" x 16" 37 lb
+0/-3 .03 .05 2 3
dB % % dB dB W
BLOCK DIAGRAM
Manual-5