Ashly MOS-FET POWER AMPLIFIERS CFT-SERIES - Manual (Page 6)

MONO OPERATION
Moni; S^viíí.h tn
Figure 5: Operation in Normal Mono Mode
With the MONO switch depressed, the channel I input is routed to both
amplifierchannels. Both channels are then controlled by the channel I level control.
Both outputs will be identical and can be connected to separate speakers. CAU­
TION! NEVER CONNECT THE RED BiNDiNG POSTS TOGETHER!
BRIDGING OPERATION
Both Swh<:ht>s In
Figure 6: Operation in Bridging Mode
в в ф Ф б О Ф Ф О Ф О О в О Ф Ф Ф О
Ashly FTX/CFT Owners Manual Page 6
To operate in bridging mode, depress both the MONO switch and the
BRIDGING switch . The MONO switch depressed routes the channel 1 input to
both amplifier channels and the BRIDGING switch depressed inverts the phase of
the input signal before it is fed to the channel 2 power amp section. The two
amplifiers' outputs are therefore 180 degrees out-of~ phase. The channel 1 red
binding post is used as the positive speaker terminal and the channel 2 red binding
post becomes the negative speaker terminal. The black binding posts are not used.
CAUTION! NEVER GROUND EITHER RED BINDING POST!
In bridging mode, the output voltage applied to the speaker is doubled, thus
providing more power to a single speaker. However, each output channel “sees”just
one-half of the load impedance when in bridging mode. For example, connecting
an 8-ohm speaker in bridging mode presents a 4-ohm load to each channel of the
amplifier. Use caution when operating in bridging mode not to exceed the power
handling capability of the speaker and the minimum load impedance on the amp.
INPUT OPTIONS
Input option panels areavailable to provide built-in featuics such asasfôreocompressor-
limiter, a mic and line mixer, acrossover for bi-amplified systems, and input transfcxmers for
signal isolation. Ashly FTX series amplifienj as well as ail other Ashly amps (excluding the
single rack spæe SR A-120) will accept Ashly input option panels.
A brief description of currently stocked input options follows. Consult your dealer
for detailed information on the input options, or call the factory.
TRANSFORMER INPUT OPTION
The input isolation transformer can be installed directly into the standard input
supplied with eveiy ASHLY amplifier (except for the single rack space SRA-120). No
soldering is necessary. The input transformer provides complete electrical isolation from
the amplifier and its signal source to eliminate any ground-induced hum noise. The
transformer input also further reduces any common-mode noise and radio frequency
interference. The transformer option must be instal led in the standard input panel and does
not change the operation of any switches or controls.
LIMITER INPUT OPTION
The limiter input option provides peak signal limiting from excessive input levels
for speaker protection and overall level control. Separate limiter threshold controls, limit
indicator LED’s and limit on/off switches are provided on each channel allowing fully
discrete stereo limiting operation.
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