Bryston 2B-LP Stereo Amplifier User Manual
Contents
1. yyww where yy is the two least significant digits of the year and ww is the week of the year must be accompanied by a copy of the bill of sale from a Bryston authorized dealer to qualify for warranty service The warranty is transferable from the original owner to a subsequent owner as long as a copy of the bill of sale from the original authorized Bryston dealer accompanies the re sale The copy of the bill of sale to any subsequent owner need ONLY include the Name of the Bryston Authorized Dealer and the Model and Serial number of the Bryston product The warranty will only be honored in the country of the original purchase unless otherwise pre authorized by Bryston BRYSTON SERVICE in CANADA BRYSTON SERVICE in the USA BRYSTON SERVICE outside Canada and the USA Postal address PO BOX 2170 Stn Main 79 COVENTRY ST Suite 5 contact your local distributor or rd re CHECK OUR WEB SITE www bryston ca ES E MAIL BRYSTON DIRECTLY cdnser bryston ca Courier address 677 NEAL DRIVE E PETERBOROUGH ONTARIO E o FAX BRYSTON DIRECTLY 01 705 742 0882 CANADA K9J 6X7 FAX 802 334 6658 PHONE BRYSTON DIRECTLY 01 705 742 5325 PHONE 705 742 5325 E mail usaser bryston ca FAX 705 742 0882 E mail cdnser bryston ca GENERAL DESCRIPTION Bryston s 2B LP stereo power amplifier consists of two amplifier modules each with its own power supply which can be operated independently or combined MONO mode to form a single 200 watt amplif2. 275 9 075 3 900 1 il r1 000 19 000 STEREO MONO L ORUSTOM Peterborough Ontario Canada C 120VAC Y gt 50 60 tz 720VA o U o t 60 on roon sZ OFF INPUT Connect only STEREO Left and Right OR a MONO speakers NEVER CONNECT BOTH STEREO amp MONO SPEAKERS AT THE SAME TIME LEFT GAUCHE MONO LEFT INPUT RED OUTPUTS ONLY MONO ENTREE DE GAUCHE SORTIES ROUGES SEULEMENT ili ao 12V AC DC REMOTE ON OFF CONTROL Typical MONO Speaker Hookup REG model shown IDEE i o SHOCK HAZARD DO NOT OPEN RISQUE DE CHOC NE PAS ENLEVER 8 ohms minimum load in bridged configuration OUTPUTS STEREO MONO ORESTO Peterborough Ontario Canada O 0 O onc oou S J OFF Typical STEREO Speaker Hookup PRO model shown RIGHT DROIT ees or INPUT LEFT GAUCHE INPUT MONO LEFT INPUT RED OUTPUTS ONLY MONO ENTREE DE GAUCHE SORTIES ROUGES SEJLEMENT ojo LESA Ei J 12V AC DC REMOTE ON OFF CONTROL SHOCK HAZARD DO NOT OPEN RISQUE DE CHOC NE PAS ENLEVER 2BLP_MANUAL_20070214
3. is especially true with amplifiers which can develop full undistorted power down to extremely low frequencies as all Bryston amplifiers can Many speaker manufacturers recommend series fuses to protect the drivers in case overload If you wish to use fuses follow the manufacturers recommendations since even small increases in current ratings of a fuse will result in large increases in power allowed Example A 3A fuse will allow about 70 watts to pass a 4A fuse 130 watts and a 5A fuse nearly 200 continuous watts It should be emphasised that almost any amplifier is capable of inflicting damage on almost any speaker if used in a thoughtless or abusive manner and that Bryston cannot be responsible for speaker damage caused in this way BRIDGED OPERATION MONO mode When operated in BRIDGED MONO mode the two internal amplifier sections are operated out of phase and the load is connected between the two HOT RED binding post terminals with no connection to ground The two amplifier sections operate together to form a single push pull amplifier with double the normal output voltage In this mode the amplifier can generate output voltages of greater than 42v rms into loads as low as 8 ohms thus producing output power levels exceeding 200 watts rms N B Only the left channel input is used in MONO mode INPUT CONNECTORS The 2B LP is supplied with one pair of input connectors either unbalanced RCA phono connectors on the home audio version or 3 pin
4. Brwssem 2B LP POWER AMPLIFIER OWNER S MANUAL IMPORTANT SAFETY INSTRUCTIONS The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of un insulated 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 1 Read these instructions 2 Keep these instructions 3 Heed all warnings 4 Follow all instructions 5 Do not use this apparatus near water 6 Clean only with dry cloth 7 Do not block any ventilation openings Install in accordance with the manufacturer s instructions 8 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 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 pro vided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs co
5. balanced XLR jacks pin 1 is ground pin 2 is positive amp pin 3 is negative with fully discrete active input circuitry on PRO units PRO models also come equipped with independent front mounted level controls All input connectors are gold plated and should be used only with quality gold plated input cable connectors as a poorly plated con nector will eventually corrode through the gold flash Bryston makes cables with appropriately heavily plated high quality connec tors available through your dealer OUTPUT CONNECTORS The 2B LP is equipped with four binding post terminals 2 red 2 black which can accept either standard banana plugs or bare wire Refer to the rear panel hook up diagram and to the descriptions of DUAL stereo and MONO operation for details on how to connect speakers to these terminals Since the binding posts are gold plated we recommend gold plated banana plugs be used for the lowest distortion N B Do not attempt to remove the red or black connector nuts from the binding post connectors They are not removable and attempting to force them off may break the connector or strip the threads OUTPUT CABLES For some time there have been available on the market special speaker cables constructed for extra high current and low loss and distortion These cables will cause no difficulty or instability with any Bryston amplifier In fact we recommend that low inductance cables be used for the smallest loss of signal between ampli
6. d cables are warranted for five years from the original date of manufacture The warranty includes parts and labour Bryston products having motorized moving parts excluding motorized volume controls are warranted for three years from the original date of manu facture The warranty includes parts and labour Bryston will remedy the problem by repair or replacement as we deem necessary to restore the product to full performance Bryston will pay ship ping costs one way usually the return portion during the first three years of warranty coverage In the event of a defect or malfunction contact Bryston s repair centers for return authorization Products must be returned using original packaging material only Packing material may be purchased from Bryston if necessary This warranty is considered void if the defect malfunction 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 possession 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 and country to country As of 2006 02 22 Bryston will only warranty Bryston products purchased through authorized Bryston dealers Bryston products with a date code of 0608 or higher date code format is
7. fier speaker GROUNDING and the GROUND SWITCH The left most switch on the rear panel is a GROUND LIFT switch It is connected between the chassis ground including the third prong on the power line cord and the signal ground This switch is normally left in the connected closed position Occasionally a multi amplifier rack installation or an unusual grounding situation with a preamp using a three wire power line cord will cause a ground loop between the signal ground and the chassis ground This switch will allow the elimination of the resulting hum in such cases without resorting to a cheater plug by switching to the separated open position Note that this switch does not disconnect the chassis from the third prong on the power line cord which must be left intact for safety reasons REMOTE ON OFF CONTROL optional Some 2B LP models come equipped with a remote on off control feature This feature allows the amplifier to be turned on and off by application of a control voltage of 12V AC or DC at 5mA The control voltage is connected via the dual spring loaded terminal block located beside the Remote Local toggle switch To insert wires press a small 1 8 wide maximum blade screwdriver into the small rectangular orange slotted levers located at the top of the terminal blocks While pressing in against the lever insert the control voltage wires into the circular openings then release the lever The terminal blocks can accept s
8. ier 80 load in a 1 rack height chassis Operated indepen dently DUAL mode each channel can deliver 60 watts into 80 or 100 watts into 40 Each of the two amplifier modules use 2 of Bryston s custom power transistors for a total of 4 output devices per 2B LP POWER CONSIDERATIONS In general if your preamp has a three prong grounded line cord you can avoid local ground loops which could cause hum or noise in the system by plugging the preamp s line cord into the same wall outlet next to the power amp CLIPPING INDICATORS The 2B LP amplifier uses a pair of 2 colour LEDs with green indicating power on and red indicating actual overload or distortion SPEAKER POWER HANDLING 8 FUSE PROTECTION Most speakers will safely absorb an undistorted musical signal up to the full power capability of even large amplifiers like the 2B LP DUAL mode However once the signal starts to be clipped the distortion by products generated by the overdriven signal can result in very high power levels fed to the smallest and most fragile of the speaker s components It should be noted that an amplifier is quite capable of distorted power levels of twice the undistorted rating and that all the excess power goes to the high frequency driver It is also quite possible to damage the woofer by causing it to exceed its excursion limits and impact against the back of the magnet by doing such things as turning up the bass control on a preamp and playing music quite loud This
9. nvenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 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 combination to avoid injury from tip over 13 Unplug this apparatus during lightning storms or when unused for long periods of time 14 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 operate 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 BRYSTON LIMITED WARRANTY Bryston analog audio circuits are warranted to be free from manufacturing defects for twenty 20 years from the original date of manufacture The warranty includes parts and labour Bryston Digital circuits an
10. ounted thermal circuit breakers CSA testing procedures call for these thermal breakers to be artificially bypassed whereupon an additional resetting thermal protection mechanism internal to the power transformers will come into play and will cycle to protect the amplifier from damage CSA does not consider this normal operation however and therefore consid ers this model unacceptable for 4 ohms loading 2B LP EXTERNAL DIMENSIONS 19 000 SPECIFICATIONS Output power 60 watts ch 8Q 18 376 i USTO gt 2 a t TOD bs o O o THD NOISE Crosstalk 100 watts ch 40 200 watts bridged 8Q O o lt 01 20Hz to 20KHz 100dB below full output FRONT VIEW 1 0004 16 874 TOP VIEW below noise 20Hz to 20KHz at 50 watts Slew rate gt 60v usec Damping factor gt 500 20Hz ref 8Q Power BW 5Hz to gt 500KHz Input sensitivity 775v for 60W 8Q Input impedance 50KQ unbalanced 10KQ balanced Power Consumption amp Heat Load 1 Idle Current 58W 2 Stereo 8 Ohms 50W ea 286W 3 Stereo 4 Ohms 100W ea 498W 4 Bridged 8 Ohms 200W 504W 5 Max Wattage 504W 6 Max Heat Dissipation 304W 1037 Btu Hr o Rubber feet FF 001b u 7 1 e a 1 0007 1 0004 x N E Nea 9
11. tranded wire gauges between 18 to 26 AWG To bypass the remote on off control place the toggle switch in the LOCAL position To turn the power amplifier off place the toggle switch in the centre position Only when the toggle switch is in the REMOTE position will the 2B re spond to a remote control voltage Please note that some 2B LP models may contain a mechanical push button power switch located on the front panel This mechanical power switch is in series with the remote electronic power switch and must therefore be in the ON pressed in position to enable the amplifier If the front power switch is in the OFF out position then the amplifier will be off regardless of the position of the rear mounted Remote ON OFF switch or the presence or absence of a dc control voltage The control voltage must be 12V at 5mA but it can be either AC or DC due to an internal rectifier circuit If a DC control voltage is used it does not matter which terminal is connected to positive and which is connected to negative CSA ADVISORY This amplifier will deliver full undistorted power at 4 ohms without current limiting and will deliver a dynamic musical signal to a 4 ohm load without overheating However Canadian Standards Association CSA procedures call for testing at 33 3 of full measured undistorted power into 4 ohms continuously which is an extreme condition insofar as internal amplifier heat dissipation and causes cycling on the heat sink m
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