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Dolby Laboratories CP65 manual From, d. Subwoofer Alignment Cat. No, Action, Indication

Models: CP65

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Page 52

5-26

B-Chain Alignment Procedures

d. Subwoofer Alignment (Cat. No. 441)

5-27

B-Chain Alignment Procedures

d. Subwoofer Alignment (Cat. No. 441)

Step No.

8

9

10

			Cat. No.
			441
		signal
		present
			tp
	Subwoofer		on
	Subwoofer		cut
			cut
		auto	freq
		off	Q
			Q
	n-sync	opt gain
	surr	mag/dig
	gain	gain
	Surround	treble
	Surround		cut
			cut
		mid	freq
	Left		Q
	Left	bass
		bass
			tp
		treble
	Surround		cut
	Surround	mid	Q
		mid	freq
	Right	bass
			gain
			gnd
		signal
		present
			Cat. No.
			441
		signal
		present
			tp
	Subwoofer		on
	Subwoofer		cut
			cut
		auto	freq
		off	Q
	n-sync	opt gain
	surr	mag/dig
	gain	gain
	Surround	treble
	Surround		cut
			cut
		mid	freq
	Left		Q
	Left		bass
			bass
			tp
		treble
	Surround		cut
	Surround	mid	Q
		mid	freq
	Right		bass
			gain
			gnd
		signal
		present
	Cat. No.
		441

Action

Dolby

Dolby

Indication

dB +10

D I P

+5

0

–5

–10

.05

.1

.2

.4

.8

1.6

3.15

6.3

12.5 kHz

Notes

Turn the freq control on the Cat. No. 441 card. A dip in the frequency response will move along the frequency axis of the RTA display.

Adjust the freq control so the center of the dip is in the same band as the highest peak

in the unequalized subwoofer frequency response you were asked to take note of in

Step 5.

dB

+10

FROM 5 :

+5

0

–5

–10

.05 .1

.2

.4

.8 1.6 3.15 6.3 12.5 kHz

Subwoofer

n-sync surr gain

Right SurroundLeft Surround

signal present

tp on

cut

auto freq

off

Q

opt gain mag/dig gain

treble

cut

mid freq

Q

bass

tp

treble

cut

mid freq

Q

bass gain

gnd

signal present

Subwoofer

n-sync surr gain

Right SurroundLeft Surround

Cat. No.

441

signal present

tp on

cut

auto freq

off

Q

opt gain mag/dig gain

treble

cut

mid freq

Q

bass

tp

treble

cut

mid freq

Q

bass gain

gnd

signal present

Dolby

Dolby

dB +10

S K I R T S

+5

0

–5

–10

.05

.1

.2

.4

.8

1.6

3.15

6.3

12.5 kHz

dB +10

+5

0

–5

–10

.05

.1

.2

.4

.8

1.6

3.15

6.3

12.5 kHz

Adjust the cut control so the center of the dip flattens. The center of the dip should be at the same level as the skirts.

Adjust the Q control for the flattest possible frequency response.

Image 52

Dolby Laboratories CP65 manual From, d. Subwoofer Alignment Cat. No, Action, Indication

Contents

Installation and Alignment Instructions Model CP65 Cinema ProcessorDolby Laboratories Inc U.S. Headquarters U.K. European OfficeDolby Laboratories Inc 100 Potrero Avenue San Francisco, CA TelephoneTable of Contents INITIAL SET-UPAND INSTALLATIONINTRODUCTION EQUIPMENT REQUIREDAPPENDIX A APPENDIX BAPPENDIX C APPENDIX DINTRODUCTION CP6504 Dolby Stereo A-type 05 Dolby Stereo SR 60 Non-syncPage 1 Dolby Tone and Pink Noise - Cat. No SECTION EQUIPMENT REQUIRED2 1kHz, 100% Modulation, Left/Right - Cat. No TEST FILM 3SMPTE Buzz Track4Stereo Optical Surround Level - Cat. No JIFFYSECTION INITIAL SET-UPAND INSTALLATION Setting VoltageAcceptable Voltage RangeCat. No Cat. No. 242, B-ChainCard Cat. No. 249, Power Supply ModuleJ5 J6 J7 J8 Cat. No. 443, Control Logic Card J3 INCP65 Backplane Standard CP65 or CP65AIn a CP65-300when Cat. No. 300 modules are fitted in place of the normal Cat. No. 350 modules J16 and J18 should be rotated so that the words “Format 42” appears the right way up. With J24 in the “NR” position input signals will be A-typedecoded when the Mag/Aux format is selected. With J24 in the “NO NR” position signals pass through the noise reduction modules but the processing will be turned off. If both of these processing options are required frequently an external switch may be connected to J24 CP65-300J1 Optical Bass Extension output level sets the output level range for the subwoofer channel. In the HIGH position J1 is set at the factory for a power amplifier input sensitivity of between 90 mV and 1.23 V. If the power amplifiers used in the installation are very sensitive 10 mV to 100 mV input sensitivity, it may be necessary to set J1 to the LOW position. If you are unsure of the sensitivity of your power amplifiers set J1 to the LOW position initially. If the high output position is required this will be determined during OBE alignment selected projector. Electronic switches select Card DescriptionsSlot CardTwo-channelNoise Reduction Module2 4 Channel Decoder 7,8,9Slot CardFunction Cat. NoVoltage Setting InternationalFuse TypeIEC NOTICES GB F D I E S NLIMPORTANT SAFETY NOTICE IMPORTANT - NOTE DE SECURITE3.Room lighting dimmer controls SCR-TYPE HUM PROBLEMSModel CP65 With CP65 FADER turned up and format 04 selected 1. Aligning the A-Chain SECTION AN OVERVIEW OF THE ALIGNMENT PROCEDURE2. Aligning the B-Chain and with a broad range of speakers. Accurate equalization requires the use of standardized acoustic measurement procedures Many loudspeakers used in theatres are far from ideal and require boosting of the low- and high-frequencyextremes in order to produce an approximation of the standard reference response curve. Bass and treble controls-centeredon the turnover points of typical loudspeakers-liftthe ends of the spectrum without the need for large amounts of narrow- band boost from the third-octavecontrols in the Cat. No. 64 cards. The third-octavecontrols are used for minor adjustments that are required to smooth the frequency response curve SECTION A-CHAINALIGNMENT a. Preliminary Procedures a. Preliminary Procedures NotesAction IndicationA-ChainAlignment Procedures a. Preliminary Proceduresa. Preliminary Procedures Notes Actionb. Optical Preamplifier Adjustments b. Optical Preamplifier Adjustments NotesAction IndicationA-ChainAlignment Procedures b. Optical Preamplifier Adjustmentsb. Optical Preamplifier Adjustments Notes ActionL L R R L L R R CAT NOb. Optical Preamplifier Adjustments b. Optical Preamplifier Adjustments NotesAction IndicationnCAT. NO. 97 TEST FILM REPEATOSCILLOSCOPE TRACES RTA DISPLAYA-ChainAlignment Procedures b. Optical Preamplifier Adjustments12 AND REPEATA-ChainAlignment Procedures b. Optical Preamplifier AdjustmentsCAT NO FOR PROJECTOR NO. REPEAT 1 →b. Optical Preamplifier Adjustments b. Optical Preamplifier Adjustments Notesc. Magnetic Preamplifier Adjustments Magnetic Alignmentc. Magnetic Preamplifier Adjustments A-ChainAlignment ProceduresMagnetic Alignment SECTION B-CHAINALIGNMENT a. Setting Room Equalization a. Setting Room Equalization Notesbypass ActionLoudspeakers and Crossovers a. Setting Room Equalizationa. Setting Room Equalization Notes Actionbypass AmplifiersGeneral a. Setting Room EqualizationB-ChainAlignment Procedures a. Setting Room Equalization NotesAction IndicationREPEAT a. Setting Room Equalizationa. Setting Room Equalization Notes ActionB-ChainAlignment Procedures a. Setting Room Equalizationa. Setting Room Equalization Notes ActionDo not adjust a. Setting Room Equalizationa. Setting Room Equalization Notes Actiona. Setting Room Equalization a. Setting Room Equalization NotesAction Indicationb. Adjusting L,C,R Gain b.Adjusting L,C,R GainL 14 → 21 R 14 → 22REPEATc. Setting Mono Gain c. Setting Mono Gain Notes79 dBC Actiond. Subwoofer Alignment Cat. No d. Subwoofer Alignment Cat. No. NotesB-ChainAlignment Procedures Action90 dBC B-ChainAlignment Proceduresd. Subwoofer Alignment Cat. No ActionFROM d. Subwoofer Alignment Cat. Nod. Subwoofer Alignment Cat. No ActionSelect format 04 Dolby Stereo A-Type d. Subwoofer Alignment Cat. NoAction REPEATSAME AS d. Subwoofer Alignment Cat. Nod. Subwoofer Alignment Cat. No ActionRe S e. Surround Equalization Alignment Cat. Noe. Surround Equalization Alignment Cat. No Actione. Surround Equalization Alignment Cat. No ActionAction e. Surround Equalization Alignment Cat. NoREPEAT e. Surround Equalization Alignment Cat. No 88 dBCAction B-ChainAlignment Procedures e. Surround Equalization Alignment Cat. NoAction Indicationf. Adjustment of Surround Delay Thumbwheel Switchmsec Settingg. Adjustment of Bypass Gain g. Adjustment of Bypass Gain Notesxx dBC B-ChainAlignment ProceduresFROM xx dBC -3dB yy dBC B-ChainAlignment Proceduresg. Adjustment of Bypass Gain g. Adjustment of Bypass Gain Notesh. Adjustment of Non-syncGain h. Adjustment of Non-syncGain NotesPress the format 60 non sync switch Actionh. Adjustment of Non-syncGain h. Adjustment of Non-syncGain NotesAction Indicationi. Adjustment of Mono Gain and Equalization i.Adjustment of Mono Gain and Equalization Notes5REPEAT PAGE 5-20STEP B-ChainAlignment ProceduresPress the format 04 Dolby Stereo A-type switch JIFFY TEST FILMj. Final Checks j. Final Checks NotesSECTION REFERENCE DIAGRAMS Cat. No. 222 Dual Noise Reduction Module INPUTS OUTPUTSPage Cat. No. 242 B-ChainFacilities Card Cat. No. 249 Power Supply Card Cat. No. 259 Transformer Module INPUTS OUTPUTSCat. No. 443 Control Logic Card CP65 POWER DISTRIBUTION TABLE Cat. No+24V +15VAPPENDIX A CHECKING PHASING OF SPEAKERS Frequency in Hz 5,00010,000 20,0001.Operation APPENDIX C CP65M MONO INSTRUCTIONS2.Cat. No. 327A Circuit Description C.2 Schematic Cat. No. 327A A3C2984 revAPPENDIX D BACKPLANE CONNECTIONS LIST CP65 Backplane ConnectionsTerminal Block TB1 Terminal Block TB2D connector J18