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Summary of Contents for Bowers & Wilkins CT800 Series
- Page 1 CT800 Series Installation Manual...
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Page 2: Table Of Contents
Connecting the System The Speakers The CT8 XO Crossover/Equaliser Description of Controls Configure the CT800 XO to the Speaker Configure the Unit to the Gain of Each Amplifier Configure the Dipole Lobe for a CT8 DS Configure the Equalisers Running In and Ancillary Equipment Aftercare Specifications... -
Page 3: Warranty
Warranty Dear customer, Welcome to B&W. This product has been designed and manufactured to the highest quality standards. However, if something does go wrong with this product, B&W Loudspeakers and its national distributors warrant free of charge labour (exclusion may apply) and replacement parts in any country served by an official B&W distributor. Limited Warranty This limited warranty is valid for a period of five years from the date of purchase or two years for electronics including amplified loudspeakers. -
Page 4: Owner's Manual
IMPORTANT SAFETY INSTRUCTIONS The CT8 XO active crossover is a powered device. Before use, please read and heed the following instructions: Caution: To reduce the risk of electric shock, do not dismantle the apparatus and do not expose the apparatus to rain or moisture. - Page 5 Do not overload wall outlets, extension cords or integral convenience receptacles, as this can result in a risk of fire or electric shock. 20 Never push objects of any kind into this product through openings, as they may touch dangerous voltage points or short out parts that could result in a fire or electric shock.
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Page 6: Introduction
Introduction Thank you for purchasing a Bowers and Wilkins Custom Theatre system. Since its foundation in 1966, the continuing philosophy of B&W has been the quest for perfect sound reproduction. Inspired by the company’s founder, the late John Bowers, this quest has entailed not only high investment in audio technology and innovation but also an abiding appreciation of music and movies to ensure that the technology is put to maximum effect. -
Page 7: The Concept
The Concept The CT 800 range comprises five products: CT8 LR A 3-way speaker intended for front left and right channels, one placed in vertical orientation at each side of the screen. CT8 DS A full range surround speaker that may operate in either 2-way dipole or 3-way monopole mode. CT8 CC A 3-way centre channel speaker that is acoustically similar to the CT8 LR, but designed with a more symmetrical drive unit layout so that it may be used in horizontal orientation immediately above or below the screen. - Page 8 Although the speakers are semi-active and require an active crossover, all power amplification must be separately sourced. Each CT8 LR, CT8 CC and CT8 DS requires two channels of power amplification, or three if used with a CT8 SW subwoofer. This allows the user maximum flexibility in choosing these components. The CT8 SW subwoofer, unlike the majority of subwoofers currently available, does not contain its own power amplifier and is used in a different manner than is usual.
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Page 9: Planning The Installation
Safety Warning! Figure 5 A CT800 system is capable of producing very high sound pressure levels. Prolonged exposure to high sound levels can lead first to temporary and later permanent hearing damage. Do not exceed recommended Leq (equivalent sound level) exposure levels, for example, those specified in ISO 1999:1990. -
Page 10: Surround Speaker Dispersion Mode
Figure 5 Figure 6 Figure 7 Surround speaker dispersion mode Surround speakers generally fall into two main types – those that one might describe as ‘normal’ speakers - so- called monopoles, where the sound comes from a set of drive units mounted on the front of the enclosure - and those that give a more diffuse sound field, such as dipoles. -
Page 11: Mounting The Speakers
Mounting the speakers Figure 6 For optimum performance, it is important that the speakers are firmly and securely mounted. All the speakers may be mounted directly at floor level, but, as mentioned above, it can be beneficial to raise the position of the surround speakers and, if the screen is high, it may also be beneficial to do the same with the front speakers. - Page 12 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 If it is desired to remove the roller glides, use the Torx key supplied with the speaker to remove the retaining ® screws. An optional, spike foot kit is also available (Part No FP22359). The kit contains 4 heavy-duty feet that have 40mm (1.6 in) of vertical adjustment, allowing tilt up to 8 if desired.
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Page 13: Installing Ct8 Ds Into A Drywall
Figure 12 CT8 DS Only Installation into drywall (figure 12) So that it can be sunk into a standard drywall up to the level of the side-firing drivers, the CT8 DS has a relatively shallow cabinet for its height and is front heavy. To maintain stability, it is equipped with a bracket that enables the rear of the cabinet to be anchored either to a wall surface or the internal studding of a drywall. -
Page 14: Installing Ct8 Ds To A Wall Surface
Figure 13 Figure 12 CT8 DS only (cont’d) Installation to wall surface (figure 13) Using the front aspect template provided, mark the centre line of the retaining bracket on the wall. The two angle brackets (A) from the kit are not required. Offer the wall bracket (C) to the wall and mark the screw positions at each end. - Page 15 Figure 14 CT8 DS only (cont’d) Figure 17 Continue for all cases Connect the signal and trigger cables to the speaker. Using the Allen key provided, remove the aluminium facing plate on the front of the speaker, taking care that the tweeter protection cover remains in position.
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Page 16: Connecting The System
Figure 15 Figure 16a Figure 16b SUB - SUB + SUB + SUB - Figure 17 Connecting the System The speakers All the speakers are provided with a comprehensive choice of connection methods. Binding posts accommodate 6mm (1/4 in) or 8mm (5/16 in) spades, 4mm banana plugs and bare wire ends and a Neutrik provides a professional industry standard multiway connection that makes it easy to make a connection in confined spaces, especially when it is sometimes difficult to see what you are doing. -
Page 17: The Ct8 Xo Crossover/Equaliser
3.5mm jack on both the CT8 XO and CT8 DS loudspeaker. Figure 18 shows the wiring diagram of a typical 5.1 CT800 system having two CT8 SW speakers, one assigned to each of the front left and right channels. -
Page 18: Description Of Controls
Figure 19 LF Contour HF Contour Figure 20 Figure 20 C10 C11 Figure 21 Description of Controls Description of controls The unit features a comprehensive set of controls to tune the performance of each speaker according to the conditions of use. The response may be shaped by a combination of three parametric equalisers, each having a level range of +4.5 / -12 dB, and low- and high-frequency contour controls, the effects of which are illustrated in figure 19. - Page 19 The DIP switches should be set as follows, where ON is down: ���� � ������ � ��������� �� �� ����� ����� ���� ����� ���� ������� ��� �� ����� ����� ���� ���� ������� ������ � ������ � ��������� �� ��� �� ������� �� ��� �� ���...
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Page 20: Configure The Ct800 Xo To The Speaker
However, a special package that includes a suitable microphone, USB sound card and a cut- down version of the software that includes everything required for tuning a CT800 system may be obtained directly from B&W. Contact your country distributor for details. -
Page 21: Configure The Dipole Lobe For A Ct8 Ds
C10 C11 C12 Figure 21 Setting the Subwoofer gain Disconnect the speakers from the power amplifiers. Connect the MF/HF power amplifier to the Subwoofer output of the unit. Set the output level of the oscillator to zero and connect it to the appropriate test input socket. Set the oscillator frequency to 25Hz. -
Page 22: Configure The Equalisers
The Theory A number of response measurements R to R are taken and the average or mean response R is calculated. The microphone is left at position and further measurements are taken as adjustments are made to the equalisation. If the measured equalised response at position (called R ) is multiplied by R... - Page 23 Connect the output of the sound card to a front test input socket of the CT8 XO and the microphone to the input of the sound card. Open WinMLS2004 From the menu, select Setup…Load… and load the setup called “B&W CT800” from the “Sound System” folder. Click the button to open the “Volume and Input Levels” window.
- Page 24 Figure 24 Figure 25 Place the microphone at the chosen measurement position that is closest to the speaker under test (where it will measure the highest sound pressure level). Set the “Input Ch.1” slider to maximum. Set the “Output” slider to zero and switch on the test signal by clicking the Ch.1”...
- Page 25 Figure 26 Figure 27 Figure 28 To set this curve as a multiplier, press the F5 key. In this dialog box, select the file you just saved (Average_resp) and, under ‘Compensation of Level’, check the ‘Tune EQ (multiply)’ box as shown (figure 26). This curve is now the reference and all subsequent measurements will be multiplied by this response.
- Page 26 Additional response shelving up to 40Hz may be achieved by altering the subwoofer gain (C14) and from 40Hz to 500Hz by altering the LF gain (C13). If you need to equalise another speaker, you must reload the CT800 setup within WinMLS and repeat the above process.
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Page 27: Running In And Ancillary Equipment
Running In and Ancillary Equipment Ancillary equipment Speakers of this ability deserve signals of the highest quality. Choose your electronic equipment and interconnecting cables with care. We can give guidance on what to look for when choosing ancillary equipment, but cannot recommend specific items. -
Page 28: Aftercare
Aftercare The speaker cabinet surfaces and the casing of the CT8 XO usually only require dusting. If you wish to use an aerosol cleaner, remove any speaker grilles first by gripping round the edges and gently pulling them away from the cabinet. -
Page 29: Specifications
Specifications Model CT8 LR Description 3-way closed-box system Drive Units 1x ø32mm (11⁄4 in) metal dome high-frequency 1x ø150mm (6 in) woven Kevlar 2x ø250mm (10 in) carbon fibre/rigid foam sandwich cone bass Frequency Range -6dB at 23Hz and 40kHz Frequency Response 29Hz –... - Page 30 Inputs Outputs Rated Power Consumption Dimensions Net Weight Finish CT8 XO CT800 system active bass management controller Bass/midrange crossover Subwoofer/bass crossover Low-frequency roll-off alignment High frequency roll-off alignment Wall proximity response adjustment Subwoofer in/out Level adjustment for number of subwoofers...
- Page 31 B&W Group Ltd UK Group (UK Sales) Copyright © B&W Group Ltd. E & OE Dale Road T +44 1903 221 500 Worthing West Sussex E uksales@bwgroup.com Kevlar is a registered trademark of DuPont BN11 2BH England Rohacell is a registered trademark of Röhm GmbH B&W Group North America T +1 978 664 2870 T +44 (0) 1903 221 800...
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