Toa FB-100 - Manual (Page 5)

5
Step 3. Disconnect the junction connector of a lead
wire coming from the connector circuit
board. (Widen the lock tab to pull the
connector.)
Step 4. Connect the MT-S0601's two connectors to
the junction connectors disconnected in Step
3.
Step 5. Connect the speaker input cable to the
desired transformer lug to set the
impedance.
Step 6. Replace the top panel and retighten the 7
screws.
Step 7. Affix the impedance label supplied with the
MT-S0601 to over the FB-100's nameplate
as shown below to indicate the selected
transformer impedance.
8. CROSSOVER CONNECTIONS WITH A FULL-RANGE SPEAKER
8.1. Recommended Filters for the FB-100
• Because the FB-100's enclosure construction
is designed to create an acoustic band-pass
filter, the mid and high frequency audio
ranges are cut even if the input signal band is
not limited with a low-pass filter. Therefore,
the FB-100 functions as a sub-woofer with no
filtering.
• The speaker driving efficiency can be
increased by inserting a low-pass filter before
the power amplifier to cut out the mid and
high frequency components of the input
signal to the sub-woofer.
• The following filter settings are recommended when using a
digital signal processor for the FB-100's signal system:
High-pass filter (–12 dB/oct):
Cut-off frequency = 40 Hz, Q = 1.0
Low-pass filter (–12 dB/oct):
Cut-off frequency = 100 Hz, Q = 1.0
Red White
MT-S0601
Impedance label
Nameplate
20
50
60
70
80
90
100
110
[dB]
50 100 500 1k 5k 10k 20k
[Hz]
FB-100's cross section Frequency-to-Output sound pressure level relationship
(1 W 1 m, 1/2 free sound field)
20
-40
-30
-20
-10
0
+10
+20
[dB]
50 100 500 1k 5k 10k 20k
[Hz]
Frequency-to-Gain relationship