User manual

CTX 3030 Audio Options
KNOWLEDGE BASE ARTICLE | KBA 21-2 Page 2
Compatible headphone wiring is required to allow the CTX 3030’s electronics detect the presence of the headphones and
automatically mute the internal speaker. Therefore, headphones that do not have compatible wiring will not be detected by the
CTX 3030’s electronics. This may result in either the speaker not muting and/or the volume in the headphones being low.
If this problem is encountered with a third party accessory set of headphones a 1/4-inch mono to stereo adaptor will allow the
headphones to work with the Headphone Module. This is because the mono socket will connect the ‘ring’ to the ‘sleeve’.
1/4-inch mono to stereo adaptor
Tip
Sleeve
Tip
Sleeve
Correct mono plug wiring - speakers in parallel Correct mono plug wiring - speakers in series
ü
ü
The following wiring diagrams show how headphones with a mono plug should be wired for both parallel and series
configurations. Mono plugs work because the ‘ring’ and ‘sleeve’ are connected and allow the detector’s electronics to detect the
presence of the plug.
Tip
Tip - audio (+)
Sleeve - headphone sense
Ring - audio (-)
CTX 3030 1/4-inch Headphone Module socket wiring
Correct headphone wiring
Headphones will be sensed and the internal
speaker will be turned off
Incorrect headphone wiring
Headphones will not be sensed and the internal
speaker will not be turned off
ü û
û
Ring
Tip
Sleeve
Ring
Tip
Sleeve
Ring
Tip
Sleeve
Ring
Sleeve
ü
ü
û
The CTX 3030 wired headphone output will work with headphones that have an impedance of 16 to 600 ohms.