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CONFIGURING THE A 21 FOR BRIDGED MONO OPERATION

6

YOU SHOULD KNOW

 

 

 

 

 

 

 

 

IMPORTANT! - Before Trying Bridged Mono 

You should not connect a speaker with an impedance of less than 8 

 to the A 21 when it is 

configured for bridged mono operation. Refer to 

Bridged Mono Operation 

in the 

Technically 

Speaking 

section  for  additional  information  about.  Use  the  right  channel  Gain  control  to 

adjust level in the bridged mode. 

1

2

3

6

4

5

7

8

Speaker

7

6

4

5

8

8

2

3

8

1

Right

Left

Components

Surround 

Sound 

Controller 

Preamp

OUTPUTS

In  certain  applications,  you  may  require  your  A  21  to  power  a  single  8 

  sp

eaker  by 

using its bridged mono feature. In most instances, you won’t use the A 21 this way and 

you can skip this section. 

What You’ll Need:

   

   

• One length of speaker wire with banana plugs, spade lugs, or bare wires

   

• One shielded balanced or unbalanced interconnect cable for each A 21 used 

   

  in bridged mono 

 

 

 

 

 

 

 

 

 

   

• One loudspeaker with an impedance of 8 

 

or higher

Before Connecting

 

 

Remove power to all the components in your audio system.

 

Set the A 21 

Stereo - Mono Bridge

 Switch to its 

Mono

 (up) position.

To Connect:

 

From the Source

    

    

Plug one end of the interconnect cable into the 

Balanced

 or 

Unbalanced Right    

   

Channel & Mono Input

 jack on the A 21

   

Plug the other end of this cable into the desired output channel on the preamplifier 

   

or surround controller. 

    

    

Do not make any connection to either 

Left Channel Input

 jack on the A 21.

To Connect: 

To the Speaker

   

   

Insert the wire with the ridge or other marking into the red 

Right

 

+

 (positive) speaker 

   

terminal on the A 21. (This is the positive speaker terminal in bridged mono.)

   

   

Insert the wire without the ridge or other marking into the 

Left 

+

 (positive) speaker 

   

terminal on the A 21. (This is the negative speaker terminal in bridged mono.)

   

Insert the wire with the ridge or other marking into the red + (positive) terminal on the speaker.

    

Insert the wire without the ridge or other marking into the black -- (negative) terminal 

    

on the speaker.

   

Do not make connections to either of the 

   

A 21's black speaker terminals.

Содержание Halo A 21

Страница 1: ...A 21 Amplifier Owner s Guide...

Страница 2: ...u are unpacking your new amplifier inspect it thoroughly for possible shipping damage If you see any contact your Parasound dealer right away Be sure to save and store both the inner and outer cartons...

Страница 3: ...NAL DC SOURCE FOR A 21 AUTOMATIC TURN ON OFF _________________________________________________________________________________ CONNECTING THE A 21 TO TRIGGER ANOTHER COMPONENT ________________________...

Страница 4: ...rackets provided With its four feet removed the A 21 chassis and front panel height occupies four rack spaces 7 or 176 mm When mounting equipment below the A 21 you will also need to allow about 1 8 b...

Страница 5: ...that you connect them to these inputs Refer to the Balanced and Unbalanced Lines in the Technically Speaking section for additional information about why we recommend using balanced lines What You ll...

Страница 6: ...e Ground switch is in its Normal down position To Connect Plug one end of the cable into the Unbalanced Right Channel Input jack on the A 21 Plug the other end of this cable into the unbalanced right...

Страница 7: ...ed or stretched once they are connected To Connect Plug one end of the cable to the right channel Loop Out jack on the A 21 Plug the other end of this cable to the right channel input jack on the othe...

Страница 8: ...lack Right negative speaker terminal on the A 21 Insert the other end of the wire with the ridge or other marking into the red right positive terminal on the speaker Insert the wire without the ridge...

Страница 9: ...th an impedance of 8 or higher Before Connecting Remove power to all the components in your audio system Set the A 21 Stereo Mono Bridge Switch to its Mono up position To Connect From the Source Plug...

Страница 10: ...ou need to first select the Manual On Off option by placing the Auto Turn On switch on the rear panel to its middle Man Manual position Connecting an Active Audio Source for Automatic On Off If you wa...

Страница 11: ...utomatically turn on and off the A 21 with an external DC voltage choose the DC Triggering option by moving the Auto Turn On switch on the rear panel to its lower 12V position What You ll Need A cable...

Страница 12: ...matically there is 12 Vdc present at its own DC Trigger Out jack so it can trigger additional amplifiers or other components on and off What You ll Need A cable with a 2 5 mm sub mini plug on each end...

Страница 13: ...oblem Please contact Parasound s Technical Service Department Left and Right Channel Status Indicators These are two small round indicators in the center of the recess in the front panel The indicator...

Страница 14: ...oltage for your unit is marked on its carton Changing the A 21 s operating voltage involves rewiring internal connections for both its main power transformer and standby power transformer plus changin...

Страница 15: ...able parts inside To avoid the risk of electric shock do not remove its top cover The amplifier s exterior can easily be cleaned with a soft cloth pre moistened only with a few drops of water or glass...

Страница 16: ...Mono Bridge switch is in the Mono bridged position Damaged speaker Move to the correct position for the jack in use Balanced Unbalanced Input switch is in the incorrect position Not enough ventilation...

Страница 17: ...cept any of the following Units with collect shipping charges Units without a valid RA number Units without a suitable shipping carton Units for which we see or hear evidence of improper packing For a...

Страница 18: ...ive signals For example when a 1 Volt signal arrives at a balanced input stage the differential input sees a positive 1 Volt minus a negative 1 Volt or 2 Volts total External hum and noise that someho...

Страница 19: ...This separates the A 21 s signal input ground from its chassis ground to isolate unwanted voltage in the ground shield of the unbalanced RCA input cable Be sure your system installation is finished b...

Страница 20: ...o drive the MOSFET drivers in the following stage Circuit designed by John Curl Parasound design consultant John Curl has been a legend among audiophiles and electronic engineers for decades He pionee...

Страница 21: ...these fuses halt operation to minimize damage to additional parts The Driver Stage The driver stage provides critical amplification for which we employ a complementary matched pair of MOSFETs selected...

Страница 22: ...ced 66 k Input Sensitivity for 28 28 V Output into 8 Unbalanced 1 V Balanced 1 V per leg Features and specifications subject to change without notice Loop Output Level Same as input level S N Ratio 11...

Страница 23: ...Parasound Products Inc 950 Battery Street San Francisco CA 94111 415 397 7100 Fax 415 397 0144 www parasound com...

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