1. FRONT MOUNTING BRACKETS - used in conjunction with the rear brackets to mount the amplifier in arack system.

2 & 6. CHANNEL GAIN CONTROLS - these controls are used to adjust the gain of each channel, theydetermine how loud each channel will sound for a given input signal level. In Bridge mode CH1 potentiometercontrols the gain on both channels and in Stereo or Parallel mode just on CH1.Gain control range is:-0 dB~0dB.The segmented surround of the controls are illuminated green in the presence of mains power.

3 & 7. SIGNAL INDICATOR -  these indicators illuminate when there is signal activity on the associatedchannel,the sensitivity is around 0.35V.

4. CLIP INDICATOR - the segmented surround of the controls are usually illuminated green,but when the levelof signal on either channel is sufficient to clip the amplifier,the surround on that channel changes to RED.When the surround is RED,the amplifier has reached its maximum power output.The distortion is around 0.5%.

5. PARALLEL INDICATOR - shows when the amplifier is in Parallel mode,i.e.acting as two separate amps with a common input.

8. FRONT AIR INTAKE - the air flow for cooling on this amplifier flows from front to back.Make sure that thereis an adequate air supply at the front of the amplifier and that the rear of the amplifier has room for the exhaust to escape.

9. MAIN POWER SWITCH- switches the mains power ON and OFF. When the power switch is turned ON,the HH logo, gain controls and the protection indicators are all illuminated, the amplifier will now self testautomatically for around 10 seconds. The protection indicators will go out when the test has finished.

10 & 11. PROTECT INDICATORS - when these indicators are ON the amplifier is in protection mode,whichincludes output short circuit,overheating, DC, VHF constant non-music high frequency signal.

12. ILLUMINATED HH LOGO - this badge is illuminated when the mains power switch is in the ON position.

Rear Panel Features:

1. MAINS POWER FUSE - only replace with the same type and rating specified on the rear panel.

2. MAINS POWER INLET SOCKET - connect the mains cord here before connecting to the power source. (Either IEC or  NEUTRIK POWERCON)

3 & 4. CH1 & CH2 SPEAKON OUTPUTS -  use these output sockets to connect the speaker cabinets. Stereo mode:1+ connects to the positive port,1- connects to the negative port.

5 & 6. CHANNEL 1 & 2 BINDING POST OUTPUTS - binding post speaker outputs are provided for each channel and the speaker cables can be terminated with banana plugs or stripped wires.The red binding posts are the signal outputs from each channel and the black posts are the chassis ground. Connect the red posts to the positive inputs of the associated speakers.For Bridge mode operation,only the red binding posts are used and the associated speaker load is connected between the two red posts.

Note : Which ever connections are used, the parallel speaker load should be limited to a minimum of 4 Ohms per channel or 8 Ohms in bridge mode for any application.

7. REAR AIR EXHAUST - the air flow for cooling on this amplifier flows from front to back, allow sufficientclearance when rack mounting the unit.

8. SERIAL NUMBER LABEL - contains the serial number of the amplifier.

9. INPUT SENSITIVITY SWITCH - this switch changes the input sensitivity of the amplifier when using low or high nominal input signals.Most professional mixing consoles operate at a nominal level of +4dBu;therefore usethe 26dB position to provide plenty of fader  movement.For a disco mixer operating at a nominal level of 0 dBu or less use the higher gain position.

10. 30Hz HI-PASS -  toggles the hi-pass filter ON/OFF. In the ON position this filter will cut extremely low subsonic frequencies,protecting the speakers from over-excursion

11.OPERATION MODE SELECTOR -  use this switch to change the operation mode of the amplifier.

• Stereo mode:Both channels are independent of each other,acts as two separate amps.
• Parallel mode:Connect to the input on CH1,the signal is sent to both CH1 and CH2 outputs.CH 2 input is not active. Acts as two separate amps but with a common input.
• Bridge mode: Connect to CH1 input, the signal is sent to both CH1 and CH2 positive ports, acts as a single more powerful amp.

12. CHANNEL 1 COMBI INPUT -  balanced input socket for use with either XLR or Jack.

13. CHANNEL 2 COMBI INPUT -  balanced input socket for use with either XLR or Jack.

14 . CHANNEL 1 LINK -  this socket is in parallel with CH1 Combi Skt and provides an output signal same asthe input signal.

15. CHANNEL 2 LINK -  this socket is in parallel with CH2 Combi Skt and provides an output signal same asthe input signal.

SR Series Set-up Connections:

Specifications:

Controls & features............2 x illuminated volume, Stereo / parallel / Bridge mode switch, Sensitivity Switch, Hi Pass filter switch, illuminated logo

Cooling.............................Variable speed fan cooled

Crosstalk..........................>70dB

Damping Factor............... >200 (8 ohm stereo, 1kHz)

Design .......................... Class A/B circuit with switch-mode power supply

Dynamic Range ...............>80dB

Frequency Response..........20Hz - 20kHz +/- 0.25dB

Indicators ..........................Power, Signal, Clip, Mode, Protect (ch1 & ch2)

Input Impedance................ Balanced 20K, unbalanced 10K

Input Sensitivity..................26dB/32dB (2.48V/1.244V)

Product Type .....................2U Rackmount Power Amplifier

Protection .........................Temperature, short circuit, DC, VHF, low power, Clip

Rated Power 2 Ohm........... 2 x 600W stereo (40ms 1kHz burst 1% THD) (2 ohm)

Rated Power 4 Ohm............2 x 450W stereo EIA standard. 1200W Bridged (40ms 1kHz burst 1% THD) (4 ohm)

Rated Power 8 Ohm............2 x 310W stereo, 900W Bridged (EIA standard) (8 ohm)

S/N Ratio........................... >90dB

Signal connections...............2 x Balanced XLR/jack combi inputs, XLR link outputs

Slew Rate...........................20V/ms (8 ohm stereo, 1kHz)

Speaker Connections........... 2 x speakon socket & 2 pairs Binding Posts

THD + N.............................<0.05% (8 ohm stereo, 1/4 rated power, 1kHz)

Voltage Gain...................... 26dB/32dB

Mains Lead.......................... IEC

Dimensions (HxWxD) (mm) ....89 x 483 x 445mm (2U 19") (3.5 x 19 x 19.5 inch)

Weight................................... 9.0Kg

Packed Volume.......................  0.051m3 (1.8 cu. Ft)