6
TD-001572-01-A
How to Set Up Your Loudspeakers and Amplifier
When designing your system, best practice is to leave approximately 20% power headroom, leaving approximately 320 W for use.
Rules for the 4 Ω
and 8 Ω
DIP Switch Settings
(Refer to
Figure 4
)
Use the 4 Ω setting for 4 Ω to 7 Ω loudspeakers; use the 8 Ω setting for 8 Ω
or more.
1. Make sure the total, nominal impedance on the first channel equals either
4 Ω or 8 Ω and set the channel DIP switch to the appropriate 4 Ω or
8 Ω setting. In the example, two 8 Ω loudspeakers in parallel giving a
4 Ω load.
2. Add the rated power of the connected loudspeakers on the first channel
(125 W + 125 W = 250 W). This total is the maximum you will use on
this channel.
3. Subtract the total rated power from 400 W and the remaining amount is
what is available for the second channel. (400 W - 250 W = 150 W)
Rules for 100 V
and 70 V
DIP Switch Settings
(Refer to
Figure 4
)
1. Connect your loudspeaker cable, in daisy-chain fashion, from the channel output to the 70 V or 100 V loudspeakers.
2. Set the transformer taps on the loudspeakers for the desired 70 V or 100 V power setting. Figure 4 shows the DIP switch set to 70 V and the
transformer taps set to 25 W,
3. Add these tap settings to get the maximum amount of power used on this output channel (25 W + 25 W = 50 W). In step 3 above, there were
150 W available; subtract 50 W (this channel's total) from the available 150 W, leaving 100 W headroom.
4. The high-pass filter (HPF) must be set to the ON position for each channel connected to 70V or 100V distribution line. An exception to this
rule is when the channel is used with a dedicated 70V or 100V subwoofer, IF it is equipped with a transformer adequately rated to handle the
maximum amplifier output power available.
Don’t-Do Rules
Do not connect low-impedance (Lo-Z) and high-impedance (Hi-Z) loudspeakers on the same channel – your results will be less than desirable.
— Figure 4 —
DIP Switch
Setting = 4Ω
8Ω + 8Ω
= 4Ω Load
CH 1
CH 2
HPF = Off
100V
70V
8Ω
N/A
200
100
50
8Ω
200
100
50
25
100V
70V
8Ω
N/A
200
100
50
8Ω
200
100
50
25
8Ω + 8Ω
= 8Ω Load
125W + 125W
= 250W
400W (Available)
-300W (Used)
=100W (Headroom)
25W + 25W
= 50W
DIP Switch
Setting = 70V
DIP Switch
Setting = 4
Ω
HPF = On
Front Panel
— Figure 5 —
1
2
3
4
5
5
1.
Ventilation exhaust holes
• The fan is variable speed, thermally controlled, which runs
faster as the temperature rises.
2.
Limiter / Protect LEDs
• Protect / Mute / Limiter
• OK
3.
Signal
• No Signal
• Signal Present
4.
Power
• Power ON
• Power OFF
• Power Standby
• After 25 minutes with no signal, the amplifier goes into Standby.
5.
Rack-mounting holes
• Four in front and four in back
