American Acoustic Development Speaker C 11 User Manual

C -11 Powered Subwoofer  
Owner's Information  
 
proprietary 10drivers, the C-11 produces clean, powerful and controlled bass.  
Three large rear-firing vents ensure ventilation of both driver and amplifier for cool  
running at high power. The vent's large bore and gas flowedcross-section reduces  
air turbulence that causes audible distortion.  
Functions and Connections  
Please refer to Fig. 3 (Front control panel) and Fig. 4 (Back panel) for functions on  
C-11 Subwoofer amplifiers  
 
Power switch on/off  
Upper position: Power on  
Lower position: Power off  
Middle position: Auto on  
At this position the subwoofer amplifier is in a stand by mode, awaiting an input  
signal. When there is no signal, the amplifier is shut down. As soon as the signal  
appears, the amplifier switches on. If signal is absent, the amplifier will shut  
down automatically after a pre-determined period of time. The power indicator  
is red when the switch is at OFF position, and green when the switch is at ON  
or AUTO position.  
Volume Control  
Use this control to balance the level of the woofer with the level of your main  
speakers.  
Crossover Frequency control  
If you are using small loudspeakers (4to 6woofers) in your main system, you  
will need to set the crossover frequency at a high position (100 to 160 Hz). If  
your main speakers have larger woofers (8and above) you will need to set the  
crossover frequency to much lower position (40 to 80 Hz). Generally, the larger  
the speaker, the greater the low frequency output will be. If the frequency  
control is set too high, the bass will appear boomydue to outputs of  
subwoofer and main speakers overlapping each other. If it is set too low, the  
bass will be ill defined and the subwoofer will sound detached from the rest of  
the system.  
Phase Control  
Use this control to determine the best possible bass performance of your system.  
There can be interference between your main speakers and subwoofer at the  
frequency where they cross over due to placement, room acoustics and type of  
main speakers used. By carefully positioning the subwoofer in the room in  
combination with the level and crossover control, you should be able to get a  
seamless transition between your main speakers and subwoofer. Start with the  
full anticlockwise 0 position. This means that the subwoofer will push out  
positive pressure wave corresponding to a positive electrical input. The  
180 full clockwise position inverts this so the subwoofer will put out a negative  
1-3  
 
pressure wave. You can use this position if you are unable to get a good  
integration between the subwoofer and main speakers.  
Equalizer on/off  
At “off” position, the amplifier will function normally without the effect of the  
5-band equalizer.  
5-band Equalizer  
Please refer to “Setting up EQ for the Room”  
High Level Inputs L&R  
These inputs should be connected to the left and right speaker terminals of your  
amplifier/receiver, if you intend to connect the subwoofer using this option  
instead of the low-level RCA input connections.  
8
High Level Output L&R  
You could connect your main speakers from the subwoofer amplifier instead of  
the main amplifier/receiver. Use this option if you are connecting the  
subwoofer up via the High Level Input.  
CAUTION! Do not use both low level and high level connection methods  
simultaneously. This may cause damage to the subwoofer and your  
amplifier/receiver.  
Low level Input & Output  
Connect this to the pre-amp output of your amplifier/receiver. If you do not  
have a pre-amp output or a power amplifier input, you can connect up the  
subwoofer using the Low Level Input/Output utilizing a tape input/output  
amplifier/receiver. Connect the tape output to the Low Level Input on the  
subwoofer, then connect the tape input to the Low Level Output on the  
Subwoofer. To switch the subwoofer into the circuit, switch the tape monitor  
input on your amplifier/receiver.  
Use this in conjunction with your receiver/amplifier. Connect this output to the  
power amplifier input of your amplifier/receiver.  
Power input socket and Fuse  
For continued protection, replace only with same type fuse. (A spare fuse is  
enclosed for replacement.)  
1-4  
 
Connection  
Please see diagrams below for different method of connecting the subwoofer to your  
main amplifier/receiver. It may be possible to use alternative connecting methods.  
Please refer to the owner's manual of your amplifier/receiver or seek professional  
advice from your retailer or installer.  
CAUTION! Before switching power on, please make sure all connections are made  
properly, i.e., positive to positive, negative to negative.  
Connection method 1:  
Connecting the subwoofer using dedicated subwoofer RCA output from receiver (see  
Fig. 5)  
Connection method 2:  
Connecting subwoofer between pre-amplifier outputs and power amplifier inputs  
( see Fig. 6)  
1-5  
 
 
Setting up EQ or the Room  
Play some familiar pieces of music that have prominent bass lines. Start with the EQ  
switched out and then adjust the EQ filters one by one switching the EQ in and out. It  
is better to start with the EQ cutting the frequencies and not boosting them.  
Remember that a 10 dB boost is adding ten times the power at that frequency so it  
would be easy to overload the system at high power levels with the EQ sliders set at  
maximum.  
Room Size and Room Position  
The size of the room and the position of sub-woofer placement will also determine  
low frequency limit of the subwoofer. So by adjusting the EQ settings, the ideal  
response can be obtained without having to place the subwoofer in an unpractical  
location. Small rooms usually add gain to low frequencies, which can be  
overpowering to the rest of the music. Large rooms need greater low frequency  
energy to sound balanced. The EQ settings can be adjusted to fit the room size. The  
5 band equalizer should be used with great caution. The power levels to the speaker  
can be boosted by as much as 10 times! So if the subwoofer is running at 100 watts  
the EQ boost at maximum will try to push the amplifier to an impossible 1000 watts!  
Although the amplifier and speakers are designed to handle overload conditions it is  
still possible to cause damage from mis-use.  
Placement of Subwoofer  
The subwoofer can be placed virtually anywhere in your room without affecting the stereo  
image of your main speakers. Placing the unit in a corner of the room will yield the greatest  
bass output but may not provide the best sound, as this position will cause maximum room  
mode resonance. You can start with this position and then move the subwoofer to different  
areas until you find the sound satisfactory. The best method is to try different positions.  
Keep a clearance of 100mm/4from the wall or furniture to provide best performance.  
1-7  
 
Service and Warranty  
The C-11 Subwoofers have a warranty period of 1 year, starting from the date of  
purchase. This warranty is provided to the original owner who purchased the product  
from an authorized  
dealer. This warranty covers defect in materials or  
workmanship that occurs in normal use only, and excludes damage that results from  
abuse, mis-use, accidents, shipping, or repairs or modifications by anyone other than  
authorized  
removed.  
representatives. The warranty is void if serial number has been  
Should you need service on your speakers, please bring it to the dealer whom you pur-  
chased from along with sales slip.  
If this is not possible, call or write to:  
American Acoustic Development LLC  
8559 Page Ave, St. Louis,  
MO 63114, USA  
Tel: 314-814-3383  
Fax: 314-628-9941  
1-8  
 
VOLUME  
FREQUENCY  
PHASE  
MIN  
MAX  
25Hz  
30  
40Hz  
Hz  
160  
80Hz  
0¡ã  
100Hz  
180¡ã  
60Hz  
POWER  
EQ  
+10dB  
0dB  
+10dB  
0dB  
OFF  
AUTO  
ON  
OFF  
ON  
-10dB  
-10dB  
C-11 Product  
C-11 Specifications  
Amplifier type  
Power  
Solid state Class A/B  
160 watts continuous into 4 Ohm  
Proprietary 10diaphragm  
Aluminum Cone / 60 Az magnet / 2voice coil  
Woofer  
Frequency response  
30 Hz to 160 Hz +/- 3 dB  
Continuously variable from 30 Hz to 160 Hz  
24dB/octave  
Electronic crossover  
Phase control  
5 Band EQ  
Variable 0 - 180  
+
10dB at 25Hz 40Hz 60Hz 80Hz 100Hz  
Low level RCA 300mv sensitivity in both channel  
High level 5 way binding post 10v sensitivity  
Inputs  
Low level RCA  
High level 5 way binding post  
Outputs  
Enclosure type  
Vented bass reflex  
514(H) x375 (W) x445(D) mm  
23.5 Kg  
Cabinet dimensions  
Net weight  
Cherry/Classic Black(viny1)  
Finish  
1-9  
 

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