Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Bowers & Wilkins CT8XO MK2
Summary of Contents for Bowers & Wilkins CT8XO MK2
- Page 1 CT800 Series CT8XO MK2 Installation and Setup Manual...
-
Page 3: Table Of Contents
Table of Contents Warranty ....................2 Important Safety Instructions ............3 Environmental Information ............... 4 Introduction ..................4 Planning the Installation ..............7 Speaker Position ................7 Surround Speaker Dispersion Mode ..........8 Mounting the Speakers ..............9 CT8 DS - Installation Into Drywall ............11 CD8 DS - Installation to Wall Surface ..........12 Connecting the System ..............14 CT8 XO Mk2 Wiring Diagram ............15... -
Page 4: Warranty
Warranty Dear customer, How to claim repairs under warranty Welcome to B&W. Should service be required, please follow the following procedure: This product has been designed and manufactured to the highest quality If the equipment is being used in the country of purchase, you standards. However, if something does go wrong with this product, B&W should contact the B&W authorised dealer from whom the Group Ltd and its national distributors warrant free of charge labour equipment was purchased. (exclusion may apply) and replacement parts in any country served by an official B&W distributor. If the equipment is being used outside the country of purchase, you should contact B&W national distributor in the country of Limited Warranty residence who will advise where the equipment can be serviced. You can call B&W in the UK or visit our web site to get the contact This limited warranty is valid for a period of five years from the date of details of your local distributor. -
Page 5: Important Safety Instructions
Important Safety Instructions WARNINGS: 18 When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or have Read these instructions. the same characteristics as the original part. Unauthorised substitutions may result in fire, electric shock or other hazards. Keep these instructions. 19 For continued protection against fire hazard, use fuses only of the Heed all warnings. correct type and rating. Follow all instructions. 20 This product should be operated only from the type of power source indicated by the marking adjacent to the power cord entry. If you are Do not use this apparatus near water. not sure of the type of power supply to your home, consult your product dealer or local power company. Clean only with dry cloth. 21 Do not overload wall outlets, extension cords or integral convenience Do not block any ventilation openings. Install in accordance with the receptacles, as this can result in a risk of fire or electric shock. -
Page 6: Environmental Information
Environmental Information Introduction Thank you for purchasing a Bowers and Wilkins Custom Theatre system. All B&W products are designed to comply with international directives on the Restriction of Hazardous Substances (RoHS) in electrical and electronic equipment and the disposal of Waste Electrical and Electronic Since its foundation in 1966, the continuing philosophy of B&W has been Equipment (WEEE). 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 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 Safety Warning! Although the speakers are semi-active and require an active crossover, all power amplification must be separately sourced. Each CT8 LR, CT8 CC A CT800 system is capable of producing very high sound and CT8 DS requires two channels of power amplification, or three if used pressure levels. Prolonged exposure to high sound levels with a CT8 SW subwoofer. This allows the user maximum flexibility in can lead first to temporary and later permanent hearing choosing these components. damage. Do not exceed recommended Leq (equivalent sound level) exposure levels, for example, those specified The CT8 SW subwoofer, unlike the majority of subwoofers currently in ISO 1999:1990. available, does not contain its own power amplifier and is used in a different manner than is usual. The original concept of home theatre based on various Dolby Digital and DTS systems advocates five or more main channels plus a single Low Frequency Effects (LFE) channel. The...
-
Page 9: Planning The Installation
Planning the Installation Figure 1 Figure 5 Check the contents against Figure 1 Figure 1 Figure 5 : Helv 45, 7pt 45, 7pt cing: 7 x 7 mm Planning the Installation x 7 mm Because of the built-in nature of the installation, the planning stage is of the utmost importance. Any need to adjust speaker position, for example, is a much more involved process than with free-standing speakers. Care must also be taken to construct proper support for the speakers. It is all too easy to induce the panels of custom furniture to vibrate and colour the sound unless precautions are taken to prevent it. Speaker Position Figure 2 Figure 3... -
Page 10: Surround Speaker Dispersion Mode
Surround Speaker Dispersion Mode Surround speakers generally fall into two main types – those that one The two bass drivers operate in both modes. In monopole mode, they might describe as ‘normal’ speakers - so-called monopoles, where the cross over to the midrange and tweeter drive units on the front face and sound comes from a set of drive units mounted on the front of the the speaker is acoustically similar to the CT8 LR, but without the swivelling enclosure - and those that give a more diffuse sound field, such as dipoles. -
Page 11: Mounting The Speakers
Mounting the Speakers 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. In that case, the supporting structure for the speakers should be substantial. If constructed of wooden studding, the framework should be arranged to be directly beneath the feet of the speaker. (figure 6) Figure 6 All the speakers are equipped with roller glides on the base panel. These allow the speakers to be easily pushed into place in custom furniture. In order to position the speakers accurately, we suggest you create circular Figure 5 Figure 6 recesses 15mm (5/8 in) diameter in the support surface to locate the glides. To avoid rocking when the speakers are in position, it is important that these recesses are accurately positioned and a foot-positioning template is supplied for this purpose. - Page 12 Note that if the optional feet are fitted, or if the speaker is Figure 8 Figure 9 tilted, appropriate allowance over and above that allowed Figure font: Helv 45, 7pt for in the template must be made when cutting an aperture Figure spacing: 7 x 7 mm in the wall. The threaded bosses that hold the feet have a large conical shape on one side of the flange. For maximum height, fit the bosses with the conical shape towards the floor. (figure 8) For minimum height, have them pointing into the speaker. (figure 9) Screw in the feet close to where you think the final adjustment will be, with Figure 10 Figure 11 the spikes or the rubber ends outermost as appropriate to the floor surface.
-
Page 13: Ct8 Ds - Installation Into Drywall
CT8 DS Only Installation into drywall only. (figure 12) So that it can be sunk into a standard drywall up to the level of the side- Using the front aspect template provided, mark round the outline at the firing drivers, the CT8 DS has a relatively shallow cabinet for its height and desired position of the speaker. Allow a little for clearance. 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 If mounting the speaker at floor level, allow extra height if there is a the internal studding of a drywall. -
Page 14: Cd8 Ds - Installation To Wall Surface
CT8 DS Only Installation to wall surface only. (figure 13) Using the front aspect template provided, mark the centre line of the retaining bracket on the wall. The two angle brackets (figure 12 - A) from the kit are not required. Offer the wall bracket (C) to the wall and mark the screw positions at each end. Drill and plug the wall to take screws in the range 5mm - 6mm (No.10 to No.12) Screw the wall bracket to the wall, trapping the stud plate (B) in position. Figure 13 Figure 12... - Page 15 CT8 DS Only ...continue for all cases Figure 14 Connect the signal and trigger cables to the speakers. 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. Fit the guide tubes (F) into the two through holes. Offer the speaker into position, ensuring that the guide tubes (F) locate over the studs of the bracket (B). When the speaker is fully in position hard against the wall bracket, withdraw the guide tubes. Using a 1/4 inch socket drive with extension and the 13mm socket provided, fit the two flanged nuts (E) onto the threaded studs and tighten.
-
Page 16: Connecting The System
Connecting the System The Speakers Figure 9 Figure 15 CT8 XO All the speakers are provided with a comprehensive choice of connection Figure 9 methods. Binding posts accommodate 6mm (1/4 in) or 8mm (5/16 in) Figure 15 spades, 4mm banana plugs and bare wire ends and a Neutrik ® Speakon ® CT8 XO socket provides a professional industry standard multiway connection that makes it easy to make a connection in confined spaces, especially Figure 9 Figure 15... -
Page 17: Ct8 Xo Mk2 Wiring Diagram
The CT8 XO Mk2 Crossover/Equaliser The CT8 XO is designed for 19-in rack mounting. If housed in an enclosed If 12V trigger switching of the dispersion mode (monopole/dipole) of the structure, proper ventilation must be supplied as stated in the in the safety CT8 DS surround speakers is required, the assigned 12V trigger output instructions. from the surround processor is connected to the 12V TRIGGER IN of one of the CT8 XO units assigned to a CT8 DS. The other CT8 XO trigger The CT8 XO is connected between the surround processor and the power inputs are connected daisy chain fashion from the TRIGGER LOOP amplifiers. The CT8 XO signal input and output connections are made socket of one to the TRIGGER IN of the next. The TRIGGER OUT sockets through balanced XLR connectors. are connected to the relevant CT8 DS speakers. The TRIGGER IN and TRIGGER LOOP sockets are mono 3.5mm jacks with the positive (12V) The wiring convention for XLR connectors is: wire connected to the tip of the plug, whereas the TRIGGER OUT socket Pin 1: Ground is a stereo 3.5mm jack on both the CT8 XO and CT8 DS loudspeaker. Pin 2: Live (+) Pin 3: Return (-) 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
Description of Controls The unit features a comprehensive set of controld to tune the performance Figure 19 of each speaker according to the conditions of use. The response may be LF Contour shaped by a combination of three parametric equalisers, each having a switchable range of +3dB, -3dB and -6dB, and low- and high-frequency contour controls, the effects of which are illustrated in figure 19. Selection of the subwoofer low-pass filter frequency also provides some response adjustment. In addition, level controls are provided to compensate for any differences in gain between both the subwoofer and LF power amplifiers compared to the MF/HF power amplifier. To access the front of the unit, remove the decorative face plate by removing the Philips screws at either end. Refer to figure 20 for the layout of the inputs and controls, which have the following functions: Input switch To switch between test and normal HF Contour inputs. Test input socket To connect external signal generator. S2 Speaker select switch To switch between front, centre and surround channels. -
Page 19: Equipment Required
Figure 20 Figure 20 T1 S2 Setting the LF gain Equipment Required Disconnect the speakers from the power amplifiers. • AC voltmeter • Signal generator capable of outputting a sine wave up to 2V RMS Connect the MF/HF power amplifier to the LF output of the unit. • Small and medium size flat bladed screwdrivers to select the switch positions and adjust the rotary controls of the CT8 XO. Set the output level of the oscillator to zero and connect it to the test input Figure 21 socket T1. Select the test input by switching the input switch S1 to And to adjust the equalisers to optimise the in-room response: “Test”. •... -
Page 20: Configuring The Equalisers
Configure the Equalisers Sensible correction of the in-room response requires the ability to measure Procedure the acoustic frequency response of each speaker individually. The measurement microphone does not need to be expensive and suitable To avoid errors from airbourne background noise and electrical electret microphones are widely available. If the appropriate measuring interference, switch off all sources in the room such as air conditioning, equipment is not available, we recommend that the parametric filters be refrigerators etc. - Page 21 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 button. Increase the output level until the “Input Ch.1” level meter just goes into the red zone. Decrease the “Input Ch.1” level until the signal peaks between the -6dB and -3dB marks. Close the “Volume and Input Levels” window and click the button to switch off the test signal. Make sure Plot…Overlay is checked to show the frequency response screen and enable several responses to be viewed simultaneously. Figure 23 Press the F7 key to bring up the Measurement Settings window. In the ‘‘Levels’’ box, set the sine sweep to -40dB FS (full scale). Perform a number of measurements in different positions by clicking button (or pressing the F2 key). Make the last measurement you take close to the centre of the listening area and leave the microphone exactly in that position for subsequent measurements.
- Page 22 To set this curve as a multiplier, press the F5 key. In this dialog box, select Figure 26 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. Click OK. The graphs will change, but ignore these changes. We now need to set division by the measurement performed in this last position with no equalisation (R Press Ctrl + F and make sure this last measurement is selected as shown in figure 27 (in this example #10 was the last measurement position and that is therefore set as reference).
- Page 23 Specify the number of parametric filters required by selecting “1”, “2” or “3” on switch S7. The markings on the filter control dials are approximate and for guidance only. Set the individual filter gain controls (S8, S9 & S10) to -6dB. Set the individual filter Q controls (C5, C7 & C9) to 4. This enables the centre frequency response of the filters to be seen. Set the individual filter frequency controls (C6, C8 & C10) initially to 25Hz. This keeps the filters away from the frequency range of interest until they are tuned one at a time to compensate the frequency response. NOTE: The P1, P2 and P3 frequency controls work counter-clockwise to allow for ease of setting. Turn the filter frequency controls (C6, C8 & C10) to the centre frequencies of the peaks or dips to be equalizsed. This is an approximate initial setting. Take repeated frequency response measurements to see the effects of the adjustments you are about to make. Every now and then you may wish to discard plots and this may be done by unchecking those you do not need on the plot list to the right of the screen.
-
Page 24: Running In And Ancillary Equipment
Running In and Ancillary Equipment Aftercare Ancillary Equipment Aftercare Speakers of this ability deserve signals of the highest quality. Choose your The speaker cabinet surfaces and the casing of the CT8 XO usually only electronic equipment and interconnecting cables with care. We can give require dusting. If you wish to use an aerosol cleaner, remove any speaker guidance on what to look for when choosing ancillary equipment, but grilles first by gripping round the edges and gently pulling them away from cannot recommend specific items. The standards of such products are the cabinet. Spray onto the cleaning cloth, not directly onto the cabinet. improving all the time and your dealer will be able to demonstrate a variety The grille fabric may be cleaned with a normal clothes brush whilst the of suitable up-to-date products. grille is detached from the cabinet. In the specification we recommend a range of amplifier powers. The When replacing grilles, ensure that the pegs are correctly aligned with the higher figure is defined by the power handling capability of the speaker. -
Page 25: Technical Specifications
Specifications Model CT8 LR CT8 CC Description 3-way closed-box system 3-way closed-box system Drive Units 1x Ø32mm (1¼ in) metal dome high-frequency 1x Ø32mm (1¼ in) metal dome high-frequency 1x Ø150mm (6 in) woven Kevlar cone FST™ midrange 1x Ø150mm (6 in) woven Kevlar cone FST™ midrange ® ® 2x Ø250mm (10 in) Rohacell cone bass 2x Ø250mm (10 in) Rohacell cone bass ® ® Frequency Range -6dB at 23Hz and 40kHz -6dB at 23Hz and 40kHz Frequency Response... - Page 26 Model CT8 DS CT8 SW Description 3-way monopole/2-way dipole selectable closed-box Closed-box subwoofer surround system Drive Units 1x Ø32mm (1¼ in) metal dome high-frequency 1x Ø380mm (15 in) carbon fibre/Rohacell sandwich cone ® 6x Ø100mm (4 in) midrange/high-frequency bass 1x Ø150mm (6 in) woven Kevlar cone FST™ midrange ® 2x Ø250mm (10 in) Rohacell cone bass ® Frequency Range -6dB at 26Hz and 40kHz (monopole mode) -6dB at 13Hz and 40kHz -6dB at 26Hz and 22kHz (dipole mode) Frequency Response 31Hz - 22kHz ±3dB on reference axis (monopole mode) 18Hz - 35kHz ±3dB on reference axis 31Hz - 18kHz ±3dB power averaged over front hemisphere (dipole mode) Dispersion...
- Page 27 Model CT8 XO Mk 2 Description CT800 system active bass management controller Functions Bass/midrange crossover Subwoofer/bass crossover Low-frequency roll-off alignment High frequency roll-off alignment 3 parametric equalisers Subwoofer in/out Level adjustment for number of subwoofers 12V trigger switching for surround mode Inputs Line In (XLR) 12V trigger (3.5mm jack) Outputs MF/HF Line Out (XLR) LF Line Out (XLR) Subwoofer Line Out (2 x XLR) 12V trigger (3.5mm jack) Rated power consumption Dimensions Height: 44.5mm (1.75 in) 1U Width: 483mm (19 in) Depth: 155mm (6.1 in) Weight 3kg (6.6 lb) Finish...
- Page 28 Copyright © B&W Group Ltd. E & OE B&W Group Ltd UK Group (UK Sales) Dale Road T +44 1903 221 500 E uksales@bwgroup.com Kevlar is a registered trademark of DuPont Worthing West Sussex 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...