QSC ABX Comparator User Manual Download Page 14

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“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.

QSC Audio Products, Inc., 1675 MacArthur Boulevard Costa Mesa, California 92626 USA

PH: (714) 754-6175 FAX: (714) 754-6174

Connectors

Line-level audio inputs and outputs: Neutrik “Combo” XLR female and ¼” TRS connectors

Speaker-level audio inputs and outputs: “Touchproof” binding posts

Control port for slave unit: HD15 female RS-232

RS-232 port for remote computer control: HD15 male

Power Requirements

Voltage line: 80-260 VAC (autosensing), 50–60Hz

Power consumption: 40 W

Physical

Dimensions: 19" (48.26 cm) W × 1.75" (4.44 cm) H × 12" (30.48 cm) D

Summary of Contents for ABX Comparator

Page 1: ...or U S E R M A N U A L ABX Comparator Double blind listening test switcher A B X C O M P A R A T O R C A L I B R AT E T R I A L R E V I E W S C R O L L P O W E R O N R C ABX1 D ATA U N I T A X U N I T...

Page 2: ...2...

Page 3: ...dio quality Slow switching between amplifiers Your audio memory is short lived You won t catch small sonic differences between amplifiers unless switching between them is quiet and fast under 50 ms Un...

Page 4: ...rrect answers the judge made A B X C O M P A R A T O R C A L I B R AT E T R I A L R E V I E W S C R O L L P O W E R O N R C ABX1 D ATA U N I T A X U N I T B E N T E R II DESCRIPTION THE ABX COMPARATOR...

Page 5: ...X Comparator and the other components needed for a listening test of two 2 channel amplifiers In addition to the ABX unit you will need the following A high quality line level stereo signal source suc...

Page 6: ...suitable for the amplifier s outputs with either a connector or stripped wireends asrequired Theotherendmusthaveeitheradualbananaplugorstrippedwireends suitable for connecting to the ABX s binding po...

Page 7: ...ors serve as the return from the devices under test and the send to the amplifier See the appendix for more details on testing line level devices IV OPERATION TURNING THE ABX ON Connect the ABX to AC...

Page 8: ...eter reading as with Channel 1 within 0 1 volt Press ENTER 5 Repeat step 3 for Amplifier B Channel 1 and again for Amplifier B Channel 2 NOTE If one of the amplifiers under test has no gain controls y...

Page 9: ...ions influence your current one Repeat this procedure for each trial The ABX unit switches only the amplifier outputs to the speakers and not the audio signal to the amps This prevents the listener fr...

Page 10: ...and while it is possible that a random sequence of responses could be right 25 out of 25 times there is only a 1 in 33 554 432 chance of it happening Therefore we can say that there is a 33 554 431 33...

Page 11: ...e fully balanced and isolated AMP INPUT A Both channel outputs of amplifier A return to the ABX comparator at the two pairs of AMP A input binding posts One pair is for Channel 1 the other for Channel...

Page 12: ...nerator for matching other equipment SLEEP MODE The useful life of the LCD display may be extended by enabling the sleep mode function Jumper J103 on the main PCB enables J103 shorted or disables J103...

Page 13: ...the ABX Compara tor recalling data from memory With each trial reviewed the LCD will display the trial number and will identify both X and the listener s selection Audio Performance Audio input and ou...

Page 14: ...54 6175 FAX 714 754 6174 Connectors Line level audio inputs and outputs Neutrik Combo XLR female and TRS connectors Speaker level audio inputs and outputs Touchproof binding posts Control port for sla...