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outside noise and hum if you use balanced lines. Stereo
signal should be connected to both the Channel 1 and
Channel 2 input jacks; however ; when operating the A
Series in Bridged Mono or Parallel modes, use the
Channel 1 input jack only.
3. Link connectors
These jacks is used to send a parallel signal form the
channel Link jacks to another device or amplifier.
4. Limiter switch
When the input signal connected to your amplifier is too
high, you end up with a distorted output signal. To
prevent this, both channels of your A Series features a
clip limiter that can be engaged or disengaged
selectively.
5.High Pass Filter (HPF) switch.
These slide switch are used to activate the built-in High
Pass Filter. The HPF rolls off signals below 40Hz. This
improves bass performance by limiting subaudio cone
motion, making more power available for the speaker's
rated frequency range. When the filter is turn off, a 5 Hz
roll off protects against DC or deep sub-audio inputs.
6. Bridge / Stereo / Parallel switch
This switch changes the amplifier operating mode from
either stereo or mono bridged or parallel. You can place
this switch in "STEREO" position (center) for normal
stereo operation. When placed in "PARALLEL" position,
the channel 1 input signal is routed to the power amplifier
of both channel. When placed "BRIDGED" position, the
PROTECTION
Every model in the A Series incorporates protection
features. The HPA Series front panel Protection LED
indicates the activity of the relay speaker connection
circuitry in each channel. When the protection LED turn
on, this circuitry is active, and all connected speakers are
muted.
Initial power-up
; For approximately five seconds after
initial power-up, the protection circuitry is activated and
the speaker outputs are muted. If everything is operating
normally, you will hear an audible click at the conclusion
of this brief period, as the protection circuitry is
deactivated and the A Series begins delivering signal to
connected speakers. It is normal for the Protection LED
to fade gradually after the amplifier is powered off.
Thermal Protection
temperatures will engage the Protect circuitry for the
overheating channel only. An output relay disconnects
the speakers until normal temperature range is restored.
During this time, the Protect LED will light. To guard
against this problem, make sure the A Series receives
adequate ventilation on all sides and that both the front
and rear panels are unobstructed. If the power
transformer gets too hot, its thermal switch will
disconnect all of the secondary power and disconnect
both channel outputs.
; Abnormally high heat sink
channel 1 input signal only is routed to both amplifiers
again. In this mode the channel 2 input is ignored.
7. 5-way Binding Post
Connect each channel of the A Series to 4 ohms or 8
ohms loudspeakers.Two pairs of 5-way binding posts
are provided for each channel, so that paralleling of
speakers is Possible.
Connection to the binding posts can be made with bare
wire, banana plugs, or spade lug terminations. Make
connections to both the Channel 1 and Channel 2
terminals for Stereo or Parallel Mode, or a single
connection across the red terminals only of Channel 1
and Channel 2 for Bridged Mono Mode.
8. Speakon output connectors
You can use these to connect each channel of A Series to
8 ohms or 4 ohms loudspeakers. Using Speakon
speaker cables, make connections to both the channel 1
and channel 2 connectots for Stereo or Parallel Mode, or
to the Bridged mode connector for Bridged Mono Mode.
9. Circuit breaker
The breaker acts in place of common discardable fuses.
This circuit breaker will trip if there is a fault with the main
voltage or if maximum output is exceeded. Simply
depress the circuit breaker and power up the unit again.
10. AC input
IEC connector for AC power cable. Connect the supplied
heavy-gauge 3-pin IECpower cable.
Short circuit
; If output is shorted due to faulty wiring, the
thermal circuitry will automatically protect the amplifier. If
this will occur, the load will be disconnected by thermal
protection circuitry (also output relay opens).
DC Voltage Protection
DC voltage at speaker output, the output relay
immediately open to prevent speaker damage.
Subsonic Frequency Protection
Filter provides subsonic frequency protection for each
channel.
Current limiting Protection
power limit, or clipping point, the limiter circuitry will be
activated. This is indicated by illumination of the Clip
LED. The channel gain is automatically reduced,
protecting the speakers from the high power. This
circuitry may be activated by uncontrolled feedback,
oscillations, improper equipment gain setting. And this
circuitry is virtually transparent in operation and full
signal bandwidth is maintained. Any time the Protection
LED lights up (except for initial power-up during
approximately five seconds), there is reason to be
concerned. If this occurs, turn the amplifier off
immediately and check carefully all wiring and external
equipments in order to locate and correct the Condition.
ENGLISH
; If an amplifier channel detects
; Built-in High Pass
; At the amplifier's full
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