Bryston 2b lp owners manual
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Page 1
IMPORTANT SAFETY INSTRUCTIONS The lightning flash with arrowhead symbol within an equilateral triangle, is intended to aler t the user to the presence of un-insulated dangerous voltage within the products 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 aler t the user to the presence of impor tant 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 manufacturers 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 par ticularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use only with the car t, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a car t is used use caution when moving the car t/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 par ts and labour. Bryston Digital circuits and cables are warranted for five years from the original date of manufacture. The warranty includes par ts and labour. Bryston products having motorized moving par ts, excluding motorized volume controls, are warranted for three years from the original date of manu - facture. The warranty includes par ts and labour. Bryston will remedy the problem by repair or replacement, as we deem necessary, to restore the product to full per formance. Bryston will pay ship - ping costs one way (usually the return por tion) during the first three years of warranty coverage. In the event of a defect or malfunction, contact Brystons 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 par t 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 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. Postal address: P.O. BOX 2170, Stn. Main PETERBOROUGH, ONTARIO CANADA K9J 7Y4 Courier address: 677 NEAL DRIVE PETERBOROUGH, ONTARIO CANADA K9J 6X7 PHONE: 705-742-5325FAX: 705-742-0882E-mail: cdnser@bryston.ca 79 COVENTRY ST., Suite 5 NEWPORT, VERMONT U.S.A. 05855-2100 PHONE: 80 2-334-1201 FAX: 802-334-6658E-mail: usaser@bryston.ca BRYSTON SERVICE in CANADA : BRYSTON SERVICE in the USA : contact your local distributor or CHECK OUR WEB SITE: www.bryston.ca E-MAIL BRYSTON DIRECTLY: cdnser@bryston.ca FAX BRYSTON DIRECTLY: 01-705-742-0882 PHONE BRYSTON DIRECTLY: 01-705-742-5325 BRYSTON SERVICE outside Canada and the USA :
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GENERAL DESCRIPTION Brystons 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 amplifier (8Ω load) in a 1 rack height chassis. Operated indepen - dently (DUAL mode) each channel can deliver 60 watts into 8Ω (or 100 watts into 4Ω). Each of the two amplifier modules use 2 of Brystons 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 preamps 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 & 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 speakers 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 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 balanced XLR jacks (pin 1 is ground, pin 2 is positive & 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 amplifier & 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.