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Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
Kensington user manual
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Kensington user manual

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  • 1. Biro Technology i n s t r u c t i o n m a n u a l Kensington Active Subwoofer
  • 2. 2 Contents Introduction ..................................................................................... 3 Features ........................................................................................... 3 Placement ........................................................................................ 4 Connection ...................................................................................... 5 Using a single Kensington in a stereo setup .............................................................. 5 Using a stereo pair of Kensingtons in a stereo setup .................................................. 7 Using a single Kensington with a surround-sound or home theater decoder ................ 7 Using a stereo pair of Kensingtons with a surround-sound or home theater decoder .... 8 Adjustment ...................................................................................... 8 Special instructions for using the Kensington with the Biro Technology L/1 .................. 9 Warranty......................................................................................... 10 Specifications ................................................................................ 10 Care ................................................................................................ 10
  • 3. 3 Introduction The Biro Technology Kensington is a high-perfor- mance active subwoofer system which when properly used will provide you with unparalleled listening pleasure. This manual contains useful guidelines and other important information that will help you get the most out of your new product. Please take a few minutes to review it. We strongly suggest at a mini- mum that you read the sections on “Placement”, “Connection”,and"Adjustment" beforeattemptingto install your new system. Features The Kensington is able to set new standards of perfor- mance for a product of its class through meticulous engineering, careful cost/benefit analyses, and ex- tended listening trials. Some of the technical features you’ll find in the Kensington include: Built-in active crossover. The on-board active crossover has been engineered so that integrating the subwoofer with your existing loudspeakers is simple and seam- less. Careful filter design assures that the subwoofer will not be localizable under any reasonable condi- tions. The crossover is completely defeatable for sur- round-sound and home theater applications. Flexible input structure. The Kensington accepts line level or speaker level inputs. Right and left channel stereo inputs are internally summed so that a single subwoofer can be used in conventional stereo or sur- round-sound application. Built-in high-power amplifer with active standby. The Kensington's built-in amplifier can generate over 200 watts of power for plenty of headroom. Input-signal sensing circuitry automatically turns the amplifier power on and off. High efficiency, long-throw 310mm (12") driver with vent- ed coil and optimally damped 2nd order low-frequency cutoff. The low-frequency response of the Kensington has been designed to be free of unnatural sounding
  • 4. 4 Placement The Kensington may be oriented either vertically or horizontally. Which makes the most sense for you will depend on your specific needs and aesthetic tastes. In either case, the cabinet should be placed on the floor with the driver side (i.e., the side with the grille cloth) facing toward the listening area. If you are using it vertically, the best results are likely to be had if the cabinet is oriented such that the low-frequency driver isasclosetotheflooraspossible.Whenpositionedthis way, the text on the back of the cabinet will be "right side up". If you are using only a single Kensington in your system, locate it midway between the main stereo loudspeakers(orfrontstereopairinasurround-sound setup). If you are using a stereo pair of Kensingtons, place them close to the main stereo loudspeakers (or front stereo pair in a surround-sound setup). In many cases a pair of vertically oriented Kensingtons can be used in leiu of loudspeaker stands. TheKensingtonisnotmagneticallyshielded.Ifyouare incorporating it into a home theater system with a standardtelevisiondisplay,besuretoprovideenough distance between it and the CRT display so that the driver's magnetic field doesn't affect it. Typically 60– 100 cm (2–3 feet) will suffice. You may wish to experiment with placing the Kens- ington closer to or farther from the rear wall. We recommend that you start with a spacing of at least 60 cm(2feet).Ifyouthencannotachieveassmoothalow- frequency response as you desire, moving the cabinet resonances and will deliver controlled and unfatigue- ing response to well below audibility. Underpinning all the design considerations in the Kensington is the standard Biro Technology credo of technology in support of music. The motivating force behind Biro Technology is, quite simply, music. In everything we do, our goal is to bring the listener closer to the spirit of the performance.
  • 5. 5 closer to or farther from the back wall may help you achieve the desired effect. This will change the sub- woofer's interaction with the room, thereby changing thenetresponsesomewhat.Exactlyhowitwillchange will be different for each room, so some experimenta- tion will be required. The Kensington's crossover was designed to integrate seamlessly with any main loudspeaker that has a reasonablywell-dampedsecond-orderlow-frequency cutoff. Therefore, for best integration between the main loudspeakers and the Kensington, we recom- mend that you plug your main loudspeaker's low- frequencyports(ifpresent)usingwell-packedfoamor a similar material. However, if you are using the Kensington as an LFE device and/or in conjunction with the bass management functions in a surround- soundorhometheaterdecoderpluggingtheportswill likely not be useful. Connection Before attempting to connect your Kensington, please read the section on Placement—especially the last- paragraph. All audio connections to and from the Kensington should be made with the power switch in the OFF position. The Kensington requires 120 VAC power. Make sure the power switch is in the OFF position and insert the AC power cable into the back of the Kensington. Then connect the other end of the cable to a source of 120 VAC power. Using a single Kensington in a stereo setup There are two sets of inputs on the Kensington—one set will accept line level inputs and the other speaker level inputs. If you are using a high-quality stereo preamplifier (or a receiver or integrated amplifier with a preamplifer outputs), you may use the Kensington's line level inputs. If your preamplifier has two pairs of outputs, simply connect one pair to the pair of LINE IN jacks on
  • 6. 6 thebackoftheKensington.Thenconnecttheotherpair the the input of your power amplifier. If your preamplifier has only a single set of outputs, then you will need to obtain a "Y-splitter" cable from a cable supplier to give your preamplifier an additional outputpair.Alternately,youmayconnectyourpream- plifier's output to the Kensington's LINE IN jacks and then use the Kensington's LINE OUT jacks to route the singal back to the power amplifier. The Kensington's LINE OUT is a direct passive connection in parallel with the LINE IN jacks (i.e., the LINE OUT signal does not undergo any processing nor is it passed through any electronics inside the Kensington.) (Note: many preamplifiers cannot drive long cables without compromising performance. If you notice a degradation in midrange or high-frequency perfor- mance after connecting the Kensington using the line inputs, we recommend you experiment with using the speakerlevelinputsasdescribedbeloworuseapream- plifier that is not sensitive to cable loads.) You can use the Kensington's speaker level inputs if: youdonothaveaccesstolineleveloutputstodrivethe Kensington, it is inconvenient to wire another set of line level cables from your electronics to the Kensing- ton, your preamplifier cannot drive the added load presented by the additional cables, or your power amplifer produces a low-frequency coloration that you like and would like the Kensington to reproduce. Using good-quality speaker wire (preferably termi- nated with banana jacks) connect the stereo ouput of youramplifertotheSPEAKERLEVELINterminalson the back of the Kensington. Pay close attention to the polarity of these connections as an incorrect connection can damage the amplifier driving the Kensington. The connec- tion to the main speakers can then be made via the Kensington's SPEAKER LEVEL OUT terminals. These terminalsareelectricallyinparallelwiththeSPEAKER LEVELINterminals.(ThustheSPEAKERLEVELOUT signalsdonotundergoanyprocessinginsidetheKens-
  • 7. 7 ington.) Alternately, you may make the connection to the main speakers directly from the output of the power amplifier by using stacking banana plugs or if yourpoweramplifierhasmorethanonesetofoutputs. Using a stereo pair of Kensingtons in a stereo setup Connecting a stereo pair of Kensingtons is just like connecting a single Kensington (as described above) except that only the right channel of your system's output is connected to the right channel Kensington and only the left channel of your system's output is connected to the left channel Kensington. It does not matter which of the Kensington's LINE IN jacks or SPEAKER LEVEL IN terminal pairs you use to make the connections. Using a single Kensington with a surround- sound or home theater decoder If your system employs a surround-sound decoder, preamplifier, or receiver with low-frequency manage- ment options, consult that product's manual for setup instructions. To use the Kensington as an LFE sub- woofer, connect the LFE output from your decoder to either of the LINE IN jacks on the Kensington. Then you may either bypass the active crossover entirely (LOW PASS control up) or with the active crossover enabled (LOW PASS control down) increase the fre- quency control to its maximum (clockwise) position. Which works best will depend on the performance of the bass management filters in your decoder. If you cannot achieve satisfactory results this way, we recommend you setup the Kensington as described above under "Using a single Kensington in a stereo setup" with the front left/right pair as the main speak- ers. Then use the "route LFE information to mains" option in your bass management software (if avail- able).
  • 8. 8 Using a stereo pair of Kensingtons with a surround-sound or home theater decoder If your system employs a surround-sound decoder, preamplifier, or receiver with low-frequency manage- mentoptions,setuptheKensingtonasdescribedabove under "Using a stereo pair of Kensingtons in a stereo setup"usingthefrontleft/rightpairasthemainspeak- ers. Then use the "route LFE information to mains" option in your bass management software (if avail- able). Adjustment The material below applies to installations where the Kensington is being integrated into a conventional stereo system. If you are using the Kensington as an LFE device (e.g. in a surround-sound or home theater system) consult the manual that came with your de- coder/preamplifier/receiver for setup instructions. Also read the material on "Using a single Kensington with a surround-sound or home theater decoder" in the section above The Kensington's crossover was designed to integrate seamlessly with any main loudspeaker that has a reasonablywell-dampedsecond-orderlow-frequency cutoff. Therefore, for best integration between the main loudspeakers and the Kensington, we recom- mend that you plug the main loudspeaker's low-fre- quency ports (if present) using well-packed foam or a similar material. If you are using the Kensington as an LFE device—e.g. in a surround-sound or home theater system—then the above does not apply. If your main speakers employ passive radiators or haveanelectricallyequalizedlowfrequencyresponse, it may not be possible to achieve satisfactory integra- tion. Again, if you are using the Kensington as an LFE device—e.g. in a surround-sound or home theater system—this does not apply. With the Kensington's Crossover switch in the ON position,theFrequencycontrolatitsminimum(CCW)
  • 9. 9 position, and the Level control at its midpoint, apply power to the system and subwoofer. Adjust the polar- ity control and leave it in the position that results in the most low-frequency output at your listening position. (If your power amplifier and loudspeakers do not invertpolarity,theidealpositionforthisswitchwillbe the 180° position.) Slowly increase the Frequency control while reducing the Level control until you achieve a smooth, integrat- ed response. (It might also be necessary to increase the level control to achieve the desired effect.) Note: There is a tendency among many users to set the FrequencyandLevelcontrolstoohigh.Whenproperly set, you should not be explicity aware of the presence of the subwoofer. The only time it should make itself known is when there is a lot of very low-frequency information present. Special instructions for using the Kensington with the Biro Technology L/1 SincetheL/1isaportedsystem,itwillbenecessaryfor you to plug its ports using the foam material supplied - roll it up and insert the roll in the port. The Kensing- ton's variable crossover was designed so that the Fre- quency control ideally will be in the minimum (CCW) position when the L/1s are set up this way. Thus it will be very unlikely, though not impossible, that you will needtomovetheFrequencycontrolfromitsminimum (CCW) position. Furthermore,theL/1doesnotinvertpolarity,soifyou are confident that your power amplifier does not in- vert polarity, the ideal position for the Polarity switch will be the 180° position. If you are not sure what your amplifier does to the polarity, then with the Level control at its midpoint adjust the Polarity for maxi- mum output at the listening position. Now simply adjust the Level control for the best bal- ance.
  • 10. 10 frequency response 25 Hz to 250 Hz ±3dB in free space driver 310mm (12.2") long throw bass unit with cast frame and polymer matrix cone. low-frequency loading 2nd-order sealed box. crossover 2nd-order lowpass variable from 40 Hz to 150 Hz with additional 2nd-order fixed lowpass at 200 Hz. (Defeatable for LFE applications.) amplifier power greater than 200 W rms. inputs stereo or mono line-level input. stereo or mono speaker-level input. controls power (off/active standby) output level output polarity (0°/180°) crossover bypass crossover frequency (42 to 200 Hz) dimensions h 395mm (15 1/2") w 725mm (28 1/2") d 450mm (17 3/4") specifications are subject to change without notice Warranty The Biro Technology product you have just purchased is guaranteed to be free of defects in materials and workmanship for a period of one year from the date of purchase. If your product should fail within that time due to a defect in materials or workmanship, BiroTechnology will repair or replace (at our option) the ailing device and ship it back to you at no charge Toobtainwarrantyservice,youmustfirstcontactBiroTechnologysothatwecandiagnosetheproblem and make sure it is necessary for you to send the product back to us. Once we have determined that we need to have the device back to fix the problem, you must carefully pack the device and send it to us fully insured using a standard carrier. You must also enclose proof-of-purchase. We cannot accept deliveries for warranty service that have not been pre-authorized. Thiswarrantyisnon-transferableanddoesnotcoverdamageduetonormalwearandtear,abuse,and/ or acts of god(s), nor does it cover incidental or consequential damages. Care CleantheKensington’scabinetusingonlyasoft,slightly damp cloth. Any other polish or cleaner may harm the finish. Do not store or use the Kensington in any area where the temperature can exceed 50°C (120°F) as some of the internal adhesives, polymers, and damp- ing agents may soften. In particular, be careful when transporting the Kensington since the interior of an automobile (even the trunk) can become quite hot on a sunny day. Specifications
  • 11. 11 POWER OFF ON OUT IN SPEAKER LEVEL IN OUT LINE MIN MAX40Hz 150Hz PHASE LOW PASS FREQUENCY LEVEL ON OFF 180° 0° LOW PASS 3A/120Vslow-blowfuse 120VAC power red=standby from main(front)poweramplifieroutputs from preamporprocessoroutput tomain(front)speakerinputs tomain(front)poweramplifierinputs green=on
  • 12. Biro Technology P.O. Box 582 Circle Pines, Minnesota 55014 (763) 786-6643 http://www.birotechnology.com/ biro@winternet.com ©2000 Biro Technology

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