TOA Electronics Speaker HB 1 User Manual

OPERATING INSTRUCTIONS  
SUB-WOOFER SYSTEM  
HB-1  
Please follow the instructions in this manual to obtain optimum results from this unit.  
We also recommend that you keep this manual handy for future reference.  
TABLE OF CONTENTS  
1. SAFETY PRECAUTIONS ............................................................................... 2  
2. GENERAL DESCRIPTION ............................................................................ 3  
3. FEATURES ......................................................................................................... 3  
4. HANDLING PRECAUTIONS ......................................................................... 3  
5. NOMENCLATURE AND DIMENSIONS ..................................................... 3  
6. INSTALLATION  
6.1. Contents ........................................................................................................... 4  
6.2. Flush Wall or Ceiling Mounting ....................................................................... 4  
6.3. Suspending the Unit in the Ceiling .................................................................. 8  
7. MATCHING TRANSFORMER INSTALLATION ..................................... 9  
8. CROSSOVER CONNECTIONS  
WITH A FULL-RANGE SPEAKER  
8.1. Recommended Filters for the HB-1 ................................................................ 10  
8.2. Level Balance and Polarity ............................................................................. 10  
9. CAUTIONS CONCERNING  
HIGH-IMPEDANCE APPLICATIONS ........................................................ 11  
10. SPECIFICATIONS ........................................................................................... 12  
Accessories ............................................................................................................ 12  
 
2. GENERAL DESCRIPTION  
The TOA HB-1 is a high-power, wall/ceiling-mounted sub-woofer system employing a 20 cm speaker unit.  
Although small in size, the HB-1 provides clear super-low frequency sound reproduction thanks to its Acoustic  
Super Woofer enclosure construction.  
3. FEATURES  
• A large, 110 mm-diameter ferrite magnet, a long, 35 mm-diameter voice coil, an aluminum bobbin, and a  
rubber roll edge combine to permit large voice coil movement at high power input.  
• The Acoustic Super Woofer system enclosure creates an acoustic band-pass filter that reproduces super-  
low frequencies down to 45 Hz and realizes slow-slope phase characteristics.  
• The enclosure is 103 mm in depth from the mounting surface, and suitable for mounting in a wall with two-  
by-four construction.  
• Rotating lock tabs permit the speaker to be temporarily fixed during installation. Also, the speaker has  
provisions for wire or bolt suspension.  
• The speaker can be converted to high-impedance applications with the addition of the optional MT-S0601  
matching transformer.  
4. HANDLING PRECAUTIONS  
No anti-magnetic provisions have been made for the HB-1 speaker. Therefore, take care to keep the unit  
sufficiently away from televisions, monitors or computer-related equipment.  
5. NOMENCLATURE AND DIMENSIONS  
(Unit: mm)  
[Rear]  
[Front]  
[Side]  
Front grille  
Speaker  
• Mounting bracket  
(standard accessory)  
Hook clip  
430  
32  
103  
[Bottom]  
Detachable input connector  
352  
3
 
6. INSTALLATION  
6.1. Contents  
Check to be sure that the following components are available in a complete set before installation:  
Speaker ..... 1 Mounting bracket ..... 1  
Front grille ..... 1 Cutout template ..... 1 Anchor piece ..... 2  
Stud holder ..... 4  
Masking tape ..... 4  
Mounting screws/washers  
Tapping screw (3x8) .... 4  
Screw (M4x30) .... 6  
"Short"... 2  
"Long"... 2  
Screw (M5x10) .... 4  
Spring washer .... 4  
Plain washer .... 4  
6.2. Flush Wall or Ceiling Mounting  
6.2.1. Flush wall mounting  
[Front ]  
[Vertical cross-sectional ]  
[Horizontal cross-sectional ]  
HB-1  
Frame lumber  
(two-by-four construction)  
Front grille  
HB-1  
Wall  
Fixing screw  
Mounting bracket  
6.2.2. Installation order  
Step 1. Using the supplied cutout template, make a 360x480 mm mounting hole in the wall or ceiling panel.  
Note  
• There must be at least 103 mm of depth behind the wall or ceiling panel.  
• The unit is mountable on the panel with thickness of 12 – 33 mm.  
Mounting surface  
Mounting  
hole  
103 mm or more  
Panel  
12 – 33 mm  
360 mm  
4
 
Step 2. Loosen the screws of the hook clips (4 places)  
attached to the mounting bracket and leave  
each screw sticking out approximately 2 mm.  
Hook clip  
Approx. 2 mm  
Mounting bracket  
Step 3. Insert the mounting bracket into the hole made in Step 1, and mount it to the back of the wall or ceiling  
panel. To mount, clamp the wall or ceiling panel with the hook clips (4 places), then tighten the hook  
clip screws.  
Wall  
surface  
Hook clip  
Mounting  
bracket  
Mounting bracket  
Step 4. Fix the mounting bracket to the wall or ceiling panel.  
[When mounting the bracket to two-by-four construction]  
Screw for  
frame lumber  
Secure the bracket to the frame lumbers from the inside (3 places  
on the left and 3 places on the right side) of the bracket.  
Note: Prepare the screws (not supplied with the unit) that are  
appropriate for the frame lumbers.  
Mounting  
bracket  
Frame lumber  
(two-by-four construction)  
[When mounting the bracket to the ceiling panel]  
Caution: Be sure to suspend the bracket using wires or bolts.  
Wire suspension: Use 4 mounting holes in the  
bracket.  
Bolt suspension: Mount the supplied anchor piece  
(2 pieces) to the bracket.  
Bolt  
Wire  
Anchor piece  
Mounting  
bracket  
Spring  
washer  
Plain washer  
Mounting bracket  
M5x10 screw  
5
 
Step 5. Install the supplied speaker fixing screws (4  
pieces with M4x30 plain and spring washers) in  
the mounting bracket so that they are left  
sticking out 2 – 3 mm from the mounting  
surface. (They are tightened in Step 10.)  
Fixing screw  
2 – 3 mm  
Mounting bracket  
Step 6. Loosen the unit's lock tab screws (4 places) and  
leave them sticking out 2 – 3 mm. (They are  
tightened in Step 10.)  
Lock tab  
2 – 3 mm  
Step 7. Connect the speaker cable to the detachable connector.  
Note: Solid or stranded cables with a cross-sectional area of 0.2 – 2.5 mm2 (corresponding to AWG24 – 14)  
can be used.  
Step 7-1. Detach the input connector from the unit's  
connector socket and loosen the screws of  
the terminals to use with a screwdriver.  
Detachable input  
connector  
Speaker  
Step 7-2. Insert stripped cable ends into the terminals, then retighten the terminal screws.  
[Single connection]  
[Bridge connection]  
5 mm  
From amplifier  
To next sub-woofer system  
Note: Tighten the screws of the unused terminals to  
prevent resonance noise.  
6
 
Step 8. Reinsert the detachable input connector into the unit's socket, then fit the unit in the mounting bracket.  
Detachable input connector  
Mounting bracket  
Step 9. Rotate the lock tabs (4 places) until each contacts the fixing screw head left sticking out in Step 5.  
Lock tab  
Fixing screw  
Lock tab screw  
Step 10. Retighten both the fixing screws (4 places) and lock tab screws (4 places).  
Lock tab  
Step 11. Using two more supplied fixing screws, fix the unit to the mounting bracket securely at two places  
shown in the figure.  
Note: After completing all of the above steps, check to ensure  
that the unit is fixed securely to the wall or ceiling panel  
surface.  
Fixing screw  
Step 12. Align the front grille with the speaker so that the four  
Front grille  
Stud receptacle  
stud screws align with the unit's corresponding stud  
receptacles, then push the grille onto the speaker.  
7
 
6.3. Suspending the Unit in the Ceiling  
12 mm-diameter hole  
When suspending the HB-1 speaker in the ceiling, remove  
the lock tabs and suspend the unit using bolts or wires at the  
resultant 12 mm-diameter holes. The front grille can be  
mounted directly to the ceiling panel using the supplied  
mounting bracket.  
Remove lock tabs.  
6.3.1. Suspending the unit  
[Wire Suspension]  
[Bolt suspension]  
Bolt  
Wire  
Ceiling  
HB-1  
Ceiling  
Mounting bracket  
HB-1  
Mounting bracket  
Ceiling panel  
Front grille  
Ceiling panel  
Front grille  
6.3.2. Front grille installation  
Step 1. Before mounting the front grille directly to the ceiling panel,  
Tapping screw (supplied with the unit)  
Stud holder  
(supplied with the unit)  
Step 1-1. Attach the four supplied stud holders to  
the mounting bracket using the four  
supplied tapping screws.  
Stud receptacle  
(Remove from the unit)  
1-1  
1-2  
Step 1-2. Detach the stud receptacles from the  
main speaker unit and attach them to  
the stud holders.  
Mounting bracket  
Use the screws removed when  
detaching the stud receptacles.  
Step 2. Mount the mounting bracket to the  
ceiling panel. (Follow Steps 1.– 4. on P.  
4 "Flush Wall or Ceiling Mounting.")  
10 mm to the inside of  
the mounting hole  
20 mm to the outside of  
the mounting hole  
Step 3. Attach the masking tapes to the ceiling  
panel as shown on the right to prevent  
the white ceiling panel from being seen  
through the front grille meshes.  
10 mm to the inside of  
the mounting hole  
Mounting hole  
(shadowed area)  
20 mm to the outside of  
the mounting hole  
Step 4. Align the front grille with the speaker so  
that the four stud screws align with the  
unit's corresponding stud receptacles,  
then push the grille onto the speaker.  
Masking tape (longer)  
Masking tape (shorter)  
8
 
7. MATCHING TRANSFORMER INSTALLATION  
An optional MT-S0601 matching transformer can be installed in the HB-1 speaker.  
Enclosure cover mounting screw (13 pieces)  
1
Cover  
Disconnect by widening  
the lock tab  
3
MT-S0601  
Red  
White  
4
2
Connection tab  
MT-S0601  
Transformer mounting screw  
Step 1. Remove the 13 enclosure cover fixing screws to detach the cover.  
Step 2. Remove the two screws located inside an enclosure. Using the removed two screws, mount the MT-  
S0601 transformer so that its connection tab is facing the front of the enclosure.  
Step 3. Detach the woofer's lead wire junction connector, and connect it to the MT-S0601's connector.  
Step 4. Connect the speaker input cable to the desired impedance tap.  
Step 5. Replace the enclosure cover.  
Step 6. Choose an appropriate impedance indication  
Nameplate  
label from those supplied with the MT-S0601,  
and affix it over the HB-1's nameplate to indicate  
the selected impedance.  
6
Indication label  
Impedance label sheet (supplied with MT-S0601)  
9
 
8. CROSSOVER CONNECTIONS WITH A FULL-RANGE SPEAKER  
8.1. Recommended Filters for the HB-1  
• Because the HB-1'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 HB-1 functions as a sub-woofer with no filtering.  
HB-1's cross section  
Frequency-to-SPL relationship  
(1 W 1 m, 1/2 free sound field)  
[dB]  
110  
100  
90  
80  
70  
60  
50  
20  
50  
100  
500  
1k  
5k  
10k  
20k  
[Hz]  
• The speaker driving efficiency can be increased by inserting a low-pass filter before the power amplifier to  
cut 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  
Frequency-to-gain relationship  
[dB]  
+20  
HB-1's signal system:  
+10  
0
High-pass filter (– 12 dB/oct):  
Cut-off frequency=40 Hz, Q=1.0  
-
-
-
-
10  
20  
30  
40  
Low-pass filter (– 12 dB/oct):  
Cut-off frequency=100 Hz, Q=1.0  
20  
50  
100  
500  
1k  
5k  
10k  
20k  
[Hz]  
8.2. Level Balance and Polarity  
When using the HB-1 in combination with TOA's F or H series Full-Range Speakers, adjust their level balance  
or polarity depending on the conditions of the installation location.  
8.2.1. Level balance adjustment  
Adjust the level of the sub-woofer or full range speaker depending on the number of units to be installed or  
installation conditions.  
8.2.2. Polarity adjustment  
• Acoustic energy increases at the crossover band for the sub-woofer and full-range speaker if the two  
speaker are in phase with each other, and decreases if out of phase. Because the phase characteristics of  
both the sub-woofer and the full-range speaker vary continuously depending on frequency, simply matching  
the connector polarities of the sub-woofer is not always the best procedure.  
• To confirm how much the acoustic energy increases or decreases, reverse the polarity of the sub-woofer's  
"+" and "–" connectors and select the connection polarity that results in the largest output of acoustic energy.  
(The use of a real-time spectrum analyzer to check the degree of energy increase is highly recommended.)  
10  
 
9. CAUTIONS CONCERNING HIGH-IMPEDANCE APPLICATIONS  
To avoid damaging the HB-1 speaker in high-impedance applications (with the MT-S0601 matching  
transformer installed), be sure to observe the following conditions:  
1. Do not limit the input signal band using such devices as a low-pass filter, but instead drive the speaker with  
the full-range signal.  
2. Use a high-impedance amplifier with a power rating higher than the wattage tap selected on the matching  
transformer.  
Note  
There is a low-frequency threshold for both the speaker matching transformer and the high-impedance  
amplifier output transformer.  
[Matching transformer low-frequency threshold]  
If a signal with frequencies lower than the low-frequency threshold is applied at rated power, the transformer's  
primary impedance (input impedance) decreases abruptly due to core magnetic saturation. With the MT-  
S0601, the impedance begins to decrease at approximately 40 Hz for the rated input power of 60 W, and is  
almost halved at 30 Hz. If the speaker is used under this condition, an increased load is put on the power  
amplifier as well as the matching transformer, causing potential equipment damage.  
The low-frequency threshold varies depending on the selected transformer tap, and the smaller the tap-  
selected wattage, the lower the threshold.  
[High-impedance amplifier low-frequency threshold]  
When a full-range signal (not band-limited) is applied, the amplifier is not adversely affected. However, if the  
signal is band-limited with a low-pass filter and driven with rated power, an increased load is put on the output  
stage, causing potential amplifier damage.  
11  
 
10. SPECIFICATIONS  
Enclosure Type  
Power Handling  
Acoustic Super Woofer system  
Continuous program: 240 W (40 – 200 Hz)  
Continuous pink noise: 80 W (40 – 200 Hz)  
8  
Rated Impedance  
Sound Pressure Level  
91 dB (1W, 1m), installation in 1/2 free sound field  
85 dB (1 W, 1m), installation in free sound field  
45 – 200 Hz (–10 dB, installation in 1/2 free sound field)  
20 cm cone type  
Frequency Response  
Speaker Element  
Input Terminal  
Detachable screw terminal, (+)/(–): 2 each (for bridge connection)  
Solid or stranded cable: 0.2 – 2.5 mm2 (corresponding to AWG24 – 14)  
Rolled steel plate, black, paint  
Usable Cable  
Finish  
Enclosure  
Front Grille  
Rolled steel plate, white, paint  
Grille Frame  
Mounting bracket  
Fire-resistant ABS resin (UL 94V-0), white, paint  
Rolled steel plate, black, paint  
Dimensions  
430 (w) x 544 (h) x 135 (d) mm  
Weight  
11 kg (front grille and mounting bracket excluded)  
MT-S0601 (rated at 60 W)  
Optional Matching Transformer  
Note: The design and specifications are subject to change without notice for improvement.  
• Accessories  
Mounting bracket .................................................. 1  
Front grille ............................................................ 1  
Anchor piece ........................................................ 2  
Stud holder ........................................................... 4  
Pattern paper ....................................................... 1  
Masking tape (long and short) ..................... 2 each  
Mounting screws  
M5x10 (for anchor piece) ................................. 4  
3x8 (for stud holder) ......................................... 4  
M4x30 with plain and spring washers .............. 6  
Spring washer (M5 for anchor piece) ............... 4  
Plain washer (M5 for anchor piece) ................. 4  
533-06-067-00  
 

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