Hk-audio CTA 118 Sub User Manual download pdf (Page 19)

E. Service

Regularly check the vents to ensure air flows freely

in and out. Clean the foam rubber filters whenever

necessary. Remove the vent grille on the back to do

this.

2. ConTour Array™

Spare Parts

Note:

• If your equipment needs service, please turn

to your HK AUDIO dealer or the HK AUDIO

distributor in your country. They stock the

required spare parts.

• In the event of a defect, always indicate the

defective device’s serial number. This way the

HK AUDIO service team can immediately find out

if an update is available for your product.

• Use only original HK AUDIO replacement

speakers and parts! Most were developed

especially for HK AUDIO products and are not

available direct from speaker manufacturers!

3. Replacing Loudspeakers

and Voice Coils

3.1 1", 8" and 18" Speakers

Proceed as follows to replace the given speaker:

• Unfasten and remove the Phillips screws holding

the grille in place. Remove the grille. These screws

are on the CT 118 Sub’s front panel and the

CTA 208’s side and bottom panels.

• Unfasten and remove the hex head bolts holding

the speaker in place.

• The speaker is now detached. Disconnect the

speaker wires.

Caution: When installing and connecting a

replacement speaker, ensure the polarity is correct!

Red= positive, black = negative

1. Maintenance

3.2 The Drivers’ Voice Coils

Proceed as follows to replace the drivers’ voice coils:

• Remove the front grille as described above.

• Unfasten the four screws holding the horn yoke

and remove the horn and driver from the baffle.

Disconnect the wires connecting the driver. Ensure

correct polarity when installing and connecting

a replacement speaker! Red= positive, black =

negative

• Unfasten the voice coil housing’s hex head bolts

using a 3 mm wrench.

• Take the lid off the voice coil housing.

• Replace the voice coil.

Important note: Replace the voice coil in a clean

working environment only. Be sure to keep dust

and dirt out of the open driver. If despite your

precautions particles manage to get in, use a strip

of adhesive tape to remove them or carefully blow

compressed air into the back of the driver to whisk

the particles out. When installing the new voice

coil, ensure it is centered properly. Proceed as

follows to check this:

Close the cover of the voice coil housing and

reconnect the cords (red = positive, black =

negative). Feed a sine wave signal with a frequency

between 1000 Hz and 1500 Hz into the mid/high

enclosure’s input. Sweep through the frequency.

If you hear abrasive noises like crackling or

scratching, the voice coil is not centered properly.

Reopen the voice coil chassis and turn the voice coil

a bit until it renders the signal cleanly!

4. Checking Speakers’ Phase

As a precaution, always check the components’

phase using a suitable phase-checker after replacing

speakers. To do this, connect the CTA 208 mid/high

unit to the CTA 118 Sub using a Speakon

cord.

Note: If you are checking the CTA 208 mid/high

unit in passive mode with an external power amp,

you will get a different phase reading! Therefore

always use the CTA 118 Sub for phase checks.

Connect the phase-checker to the CTA 118’s signal

input. It may be advisable to lower the input level on

the DDO-Pro™ Controller!

The speakers’ phases should read as follows:

With CTA 118 Sub:

18" woofer: In phase (+)

8" speaker: Out of phase (-)

1" driver: In phase (+)

CTA 208 passive:

8" speaker: In phase (+)

1" driver: Out of phase (-)

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Hk-audio CTA 118 Sub User Manual Page 19

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