Bryston 875Z Stereo Amplifier User Manual
Contents
1. REAR PANEL of BRYSTON 875Z POWER AMPLIFIER CH2 ZONE4 CH 1 SERIES CH2 CH 1 SERIES CH2 ZONE2 CH 1 SERIES CH2 ZONE1 CH1 Du LEFT BUS 4 LEFT BUS 4 r LEFTBUS 4 LEFTBUS a 2 RIGHT BUS Wl WM nier bus RIGHT BUS LEFT EE CINPUT SELECT SWITCHES gt 1998087 EE lt INPUT SELECT SWITCHES gt p CRM T our THRESHOLD XE INPUT BUSES Eos T STEREO STEREO STEREO STEREO RIGHT POWER UP Model 8752 12V AC DC lt SINGLE ENDED INPUTS gt lt SINGLE ENDED INPUTS gt lt SINGLE ENDED INPUTS gt No 875 000002 SERIES SERIES SERIES SERIES E MUTE OPTION MUTE OPTION SIG EXT SIG EXT MUTE OPTION ON SIG EXT MUTE OPTION SIG EXT LEVEL POWER LEVEL LEVEL E SERIES Y LEVEL zONEI MUTES SERIES SERIES 4 im pm 750 80 7O250W 80 7 750 80 E OUTPUTS OUTPUTS OUTPUTS 24 lt 12V ON OV OFF FRONT CENTRE FRONT LEFT FRONT RIGHT A sub woofer is often located out of the way due to its inherent lack of directionality A powered sub woofer which contains its own power amplifier as shown above is connected directly to the surround sound processor Centre line 110 The LEFT SURROUND and RIGHT SURROUND speakers should be positioned the at 110 degrees and 112. 8754 OWNER S MANUAL 10 11 12 13 14 A A IMPORTANT SAFETY INSTRUCTIONS The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the product Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus includ ing amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched p
3. red terminal on the loudspeaker Use the black terminal to feed the black terminal on the loudspeaker SERIES mode Use the Ch1 red terminal to feed the red terminal on the loudspeaker and Use the Ch2 red terminal to feed the black terminal on the loudspeaker MUTE OPTIONS SWITCH Each zone has individual muting options ON Left position Zone will remain on as long as power is on in the amplifier SIG Centre position Mutes the Zone when the signal is absent for more than 8 minutes EXT Right position Zone will mute when 12v is present at the External Zone Mute connector 9 3 8752 EIGHT CHANNEL POWER AMPLIFIER 8 SIGNAL SENSE THRESHOLD When the MUTE OPTIONS SWITCH of any of the four zones is set to the S G position that zone is muted unless the input signal exceeds the threshold level set by the SIGNAL SENSE THRESHOLD control Only the input levels of the ODD numbered channels is measured by the sense circuitry ie ch1 in zone 1 ch3 in zone 2 ch5 in zone 3 and ch in zone 4 although both channels in the zone will be muted and un muted by the SIGNAL SENSE THRESHOLD mute circuitry The minimum setting for this threshold is 20mV and is at the fully counter clockwise position of the S GNAL SENSE THRESHOLD control The maximum threshold is approximately 100mV and is at the fully clockwise position 9 EXTERNAL ZONE MUTE CONNECTOR When 12 volts is applied between the COM pin and a Z pin th
4. 25kg 55 108 Power Consumption amp Heat Load max power typical use single channel 75W 8 ohms 150 Watts 15 Watts 8 channels 75W 8 ohms 1200 Watts 120 Watts Max Heat Dissipation 8 ohms 2400 Btu Hr 240 Watts single channel 100W 4 ohms 210 Watts 21 Watts 8 channels 100W 4 ohms 1680 Watts 168 Watts Max Heat Dissipation 4 ohms 3500 Btu Hr 350 Watts At Idle 110 Watts BRYSTON 20 YEAR WARRANTY Bryston products are warranted to be free from manufacturing defects for a minimum of twenty years from the original date of manufacture This includes parts labour and return shipping to the first owner and all subsequent owners Warranty coverage is automatic and commences with the original date of manufacture which is kept on file at Bryston In the event of a defect or malfunction Bryston will remedy the problem by repair or replacement as we deem necessary to restore the product to full performance This warranty is considered void if the defect mal function or failure of the product or any component part was caused by damage not resulting from a defect or malfunction or abuse while in the pos session of the customer Tampering by persons other than factory authorized service personnel or failure to fully comply with Bryston operating instructions voids the warranty This warranty gives you specific legal rights and you may also have other rights which may vary from province to province an
5. Thermal Shutdown The 875 channel has thermal shutdown circuitry to prevent damage due to over heating Should thermal shutdown occur the both stereo channels will mute and the channel leds will turn orange indicating this condition When the channels have cooled to a safe operating condition the channels will return to normal operation Persistent Thermal shutdown indicates steps need to be taken to increase airflow across the channels heat sink Also see installation section on ventilation FUSES There are two fuse holders located at the front edge of the top panel When checking fuses power down the unit and dis connect the power cord Use only the specified fuses as indicated on the label located between the two fuse holders on the top panel See photo at top of page DUST FICHT CHANNEL FONERA AMPUHER 875Z REAR PANEL CONNECTORS amp SWITCHES The following is a description of the rear panel switches for the 875 Zone Amplifier and their function There are 8 x 75 watt amplifiers in the 875B Zone amp The channels are split into 4 zones each with 2 channels Each zone will operate in stereo or the channel outputs may be connected in series to achieve a mono channel of 250 watts Both channels in each zone have 4 input options 1 ODD NUMBERED CHANNEL INPUT SELECTORS Channels 1 3 5 7 This four position slide switch selects input signals for this channel and in SERIES bridged mode it is the sole input used for the
6. Local external switch To power up the 875 using an external control voltage supply a 4v to 12v AC or DC control voltage to the IN terminals of the Power Up connector The front panel Power switch needs to be off for remote operation Use paired wire of 22 gauge to 18 gauge between the source device and the 875 The amplifier will now power up when the control voltage is present Immediately following power up the control voltage will appear at the OUT terminals of the Power Up connector for the control of other equipment Removal of the control voltage causes the 875 to turn off and the control voltage at the OUT terminals is interrupted AC power input This is a high current plug for the power cord receptacle Check that the voltage rating at the right of the connector con forms with your locality With the front panel power switch in the off position insert the power cord into the 875 then plug the other end to an appropriate A C power outlet REAR PANEL DETAIL of 875Z AMPLIFIER KC INPUT BUSES RIGHT POWER UP 12V AC DC REAR PANEL DETAIL of BRYSTON SP1 SURROUND PROCESSOR PREAMP POWER EXTERNAL ZONE MUTES a OC E AUX IR EA 25 12V ON OV OFF MUTE C ON OFF SES ETON This signal can be used to turn on subsequent voltage stripped amp tinned wires controlled devices 24 to 12 gage stranded copper Strip length 28 7mm PLUG IN SCREW TERMINAL CONNECTOR Insert wires into open
7. combined channel 1 2 3 4 5 6 or 7 8 amplifier channel m 151 position top left stereo bus 210 position right stereo bus a 314 position sum of left and right stereo bus mono of stereo bus ath position bottom direct input from RCA jack 875 v 75watts 8ohms EVEN NUMBERED CHANNEL INPUT SELECTOR Similar to above INPUT SELECTOR SWITCH but only controls the input to channel 2 4 6 or 8 when the pair of adjacent channels is in STEREO mode In SERIES mode this switch has no effect STEREO BUS INPUTS 2 daisy chained RCA connectors for the left white bus input and two daisy chained RCA connectors for right red bus input Sensitivity is 875 mV for an ouptput of 75 watts into 8 ohms STEREO SERIES SWITCH Controls the two channels in this zone STEREO top position individual channels SERIES bottom position bridged mode wherein channels 1 2 using only Ch1 input or channels 3 4 using only Ch3 input or channels 5 6 using only Ch5 input or channels 7 8 using only Ch7 input are combined into a single higher power channels Sensitivity in SERIES mode 1 8v input at 250 watts output into 8ohms CHANNEL DIRECT INPUT CONNECTORS Sensitivity 875mV for an output of 75watts into Bohms CHANNEL LEVEL CONTROL Normal or maximum is fully clockwise Minimum is fully counter clockwise which fully attenuates the input signal SPEAKER BINDING POST CONNECTORS STEREO mode Use the red terminal to feed
8. elevator style wire clamp and tighten with slot screw driver Do not over tighten or wires may eventually come lose Mese Maximum tightening torque is 4 5 Ib IN in 0 5Nm Note The OUT terminals of the Power Up connector are connected to the IN terminals once the 875 has powered up The control current across the OUT terminals is determined by the source equipment The carrying current of the OUT relay is 2 amps The 875 itself draws less than mA from the control current when operating SERIAL NUMBER SP1 12V TRIG OUT Power Output Gain Select and Sensitivity Input Impedance Distortion IMD or THD noise Noise Slew Rate Power Bandwidth Damping Factor Dimensions Weight 8757 EIGHT CHANNEL POWER AMPLIFIER Technical Specifications 5 watts per channel into 8 ohms 100 watts per channel into 4 ohms 29dB 850Vin 75W 8 Ohms single ended input 23dB 1 7 75W 8 Ohms balanced input 20 Kohms single ended 40 Kohms balanced 0 00796 20Hz to 20kHz at 75 watts into 8 ohms 0 010 20Hz to 20kHz at 100 watts into 4 ohms Measured with input shorted 20Hz to 20kHz gt 105dB below rated output 29dB gain 68dBu gt 107dB below rated output 23dB gain 7OdBu gt 60 volts microsecond 1 Hz to over 100 kHz Over 500 at 20 Hz ref 8 ohms W D H 19 or 17 x 19 x 3 5 inches 2 rack spaces approx
9. 0 degrees from centre respectively LEFT SURROUND RIGHT SURROUND If a Single Back Surround speaker is used in place of two Back Surround speakers it should be located on the If two Back Surround speakers are used in a 7 1 system as shown they should be placed equidistant from the centre line and behind the listeners such that they do not point directly at the listeners 30787200 PE DEN CHANNEL SE CH1 CH1 CH5 INPUT POWER AMP OUT gt POWER AMP OUT gt SWITCH STATUS LED STATUS LED CH 1 4 CH 5 8 POWER BRIDGE PONER BRIDGE SUPPLY STEREO SUPPLY STEREO MUTE RLY SWITCH SWITCH STATUS C LED STATUS LED CH2 SE gt POWERAMP OUT gt D SE CH2 CH6 INPUT INPUT SWITCH SWITCH 24v 24 24 fd pipi Z1 MUTE Z3 MUTE ZAMUTE IU 33V 48V 33V 15 RR CH3 gt POWER AMP gt OUT STATUS LED BRIDGE BRIDGE STEREO STEREO MUTE RLY SWITCH SWITCH OUT STATUS LED STATUS C LED STATUS LED SE CH4 CH8 gt POWER AMP OUT gt POWER AMP OUT gt CH2 INPUT SWITCH 24 24 24v 24 24v 824v 12v REMOTE TURN ON POWER UP AND ZONE MUTE CONTROL CIRCUITRY POWER SWITCH AC IN SOFT START CIRCUITRY A A 12v ZONE MUTES Sa yer 875 SERIES 8 CHANNEL POWER AMPLIFIERS DRISTOR POWER CONTROL External control voltage power u
10. alanced input is 23dB and the single ended input is 29dB 8752 A Home Install version Z has 4 stereo amplifiers separated into 4 zones can be independently muted or respond to program sense circuitry Each channel can select from a discrete input or from a common stereo input when distribution is wanted The inputs are single ended with a gain of 29dB Each stereo pair may be bridged The power up sequence of either 875 model may be controlled from a 12v control voltage The 875 uses soft start power control circuitry to eliminate high inrush currents when A C power is applied WARRANTY see back page for details SHIPPING BOX amp PACKING MATERIAL Please keep the original shipping box and all packing material This will ensure the amplifier is protected in future trans port In the unlikely event you have a problem and must return it for service you must use the proper packing material Ship the amplifier only in the original packing material as the unit is not insurable by carriers otherwise INSTALLATION The most important installation consideration is ventilation The 875 series amplifiers are a convection cooled Unrestricted air flow across its heat sinks is a must For this reason do not install anything directly above it Allow 3 5 2u to 5 3u inches of space above and to the sides of this amplifier Do not install directly above other heat generating equip ment Should your installation conditions be constr
11. articularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combi nation to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not oper ate normally or has been dropped WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR SPLASHING AND ENSURE THAT NO OBJECTS FILLED WITH LIQUIDS SUCH AS VASES ARE PLACED ON THE EQUIPMENT TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE AC MAINS DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC RECEPTACLE THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE 968170907 Table of Contents Important Safety Instructions General Introduction Introduction Description Shipping Box amp Packing Materials Installation Wiring the 875Z Front Panel Power S
12. d country to country BRYSTON SERVICE CANADA BRYSTON SERVICE USA BRYSTON SERVICE OUTSIDE CANADA the USA 24 STEINWAY BLVD UNIT 48 79 COVENTRY ST SUITE 5 CONTACT YOUR LOCAL DISTRIBUTOR ETOBICOKE ONTARIO NEWPORT VERMONT OR CANADA M9W 6T8 U S A 05855 2100 CHECK OUR WEB SITE www bryston ca E MAIL BRYSTON DIRECTLY info bryston ca PHONE 416 675 2585 PHONE 802 334 1201 FAX BRYSTON DIRECTLY 705 742 0882 FAX 416 675 3103 FAX 802 334 6658 PHONE BRYSTON DIRECTLY 705 743 5325 E mail cdnser gta igs net E mail usaser bryston ca BRYSTON LTD 677 NEAL DRIVE P O BOX 2170 PETERBOROUGH ONTARIO CANADA K9J 7 4
13. e corresponding Zone will be muted When the 12 volt control signal is removed the channel will be un muted 10 POWER INLET Primary or mains power cord input connector IEC 320 inlet Connect the supplied power cord to this connector only after checking the unit label and verifying that the amplifier is set for your local power requirements for A C voltage and line frequency 11 POWER UP CONNECTOR When an external 12v control signal is applied between the 2 IN pins on the connector the amplifier will power up When the 875 has powered up the incoming 12v is handed to the OUT terminals to turn on other equipment This circuit draws 2 ma to turn the 875 on SPEAKER BINDING POST CONNECTORS REAR PANEL of 875Z CH2 ZONE1 CH 1 SERIES LEFT BUS 1 fA max INSULATED WIRE ABUS SIGNAL SENSE up to 3 AWG in size LI L R BUS THRESHOLD Stripped 5 8 to 314 INPUT BUSES SPADE LUG 16mm to 18mm STEREO RIGHT POWER UP Model 875Z 120VAC 60Hz 2300VA 12V AC DC Serial No 875 000002 SERIES Date 0401 ON SIG EXT POWER INLET EXT LEVEL LEVEL ZONE MUTES SERIES 4 75W 80 19250 80 1 75W 8O COM BANANA PLUG 8757 EIGHT CHANNEL POWER AMPLIFIER REAR PANEL TYPICAL HOOKUP of Fari a an 875Z in a 5 1 HOME SURROUND SOUND PROCESSOR THEATRE UNBALANCED OUTPUTS N STALLATI BALANCED OUTPUTS
14. icted then additional forced air cooling may be necessary Any 875 channels thermally shutting down during operation indicates insufficient cooling and a remedy must be found for cooling the amplifier Provide a minimum 6 space to the rear of the 875 for ventilation and dressing cables to and from the ampli fier Never operate the 875 in a vertical position WIRING THE 8752 also see rear panel description Speaker wires should be as short as practical Use quality wire and if runs are more than 3 meters use at least 12 gauge wire The speaker binding posts will accept wire up to 3 gauge in size Bryston can custom build cables for your applica tion A C power Before plugging in the power cord be sure your 875 is specified for the correct A C voltage for your locality The voltage is listed by the power input connector Never lift the safety ground to the amplifier or remove the ground pin from the plug Power line conditioners The 875 s performance will not improve with the use of power line conditioners In fact most of the time they restrict the flow of current in the power line to the amplifier thereby reducing performance at high output levels 1 1076770 BUE IA CHANNEL NON CHE FUSE FOR FUSE FOR ZONES 1 amp 2 ZONES 3 amp 4 Bina sem 757 POWER FRONT PANEL of 875Z Blk FRONT PANEL POWER switch The front panel label 8752 POWER is a switch used to apply or remove A C line power to the 875 soft start c
15. ircuitry Push the switch and the 875 will initiate the start up sequence The switch cap remains indented when circuits are on Push the switch again the 875 will initiate the power off sequence LED Indicators Each 875 channel has a single multi colour LED indicator to monitor the following conditions Unlit LED no power The 875 channel LED when unlit indicates no A C mains power is present at the channel If all channel LED indica tors are unlit the 875 probably needs only to be powered on A group of 4 LEDs not lighting possibly indicates a blown group fuse When checking fuses unplug the power cord Use only the specified fuses for your operating volt age See FUSES section below Red LED muted Each channel normally mutes momentarily during power up and power down sequences Green LED operating normally Flashing Red LED Clipping Clipping occurs when the channel output level no longer can follow the level increase at the input Over driven input condition When a 875 channel is driven into clipping the channel led will change from green to red then back to green when the level is reduced Flashing Red Momentary clipping can be tolerated however it indicates that maximum un distorted power has been surpassed and potential speaker damage may result if over load conditions persist Any amplifier that is constantly operated into clipping indicates a more powerful amplifier is needed for that application Orange LED
16. witch LED Indicators Fuses 875Z Rear Panel Connectors amp Switches Input Select Switches Stereo Bus Inputs Stereo Series Switch Channel Direct Input Connectors Channel Level Control Speaker Connectors Mute Options Switch 8757 Rear Panel Connectors amp Switches contd Signal Sense Threshold External Zone Mute Connector Power Inlet Power Up Connector Typical Hookup of the 875Z in a 5 1 Home Theatre Installation Block Diagram AC Power Control External Control Voltage Power Up AC Power Input Technical Specifications Important Warranty Information 875Z MANUAL 2004 03 24 875Z EIGHT CHANNEL POWER AMPLIFIER Inside front cover Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Back Cover 30787200 ciate teen INTRODUCTION Thank you for choosing the 875 Eight Channel Power Amplifier Bryston welcomes any suggestions you may have or comments regarding the operation of your amplifier We consider you our customer to be Bryston s most important resource and your opinion is very much appreciated DESCRIPTION The 875 series is a modular multi channel audio power amplifier design of 8 x 75 Watts per channel Currently the 875 is available in two different versions 2 875 Home Theatre version the HT is essentially 4 stereo amplifiers Each stereo pair selects from bal anced or single ended inputs Each stereo pair may be bridged The gain of the b
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