Earthquake Sound Speaker CP 8 User Manual

Sound That Will Move You  
CouchPotato  
300 Watt  
Digital  
Powered  
Subwoofer  
User's Manual  
 
CP-8 Installation Manual  
Operating & Controlling Your CP-8  
Features & Specifications:  
Before you make any connections to power up your Couch Potato, please  
double check the following:  
AMPLIFIER  
1. The input power switch 110 AC or 220 AC based on your local  
power.  
- Power Output: 300 Watts  
2. Please make sure that the gain/volume knob is set tominimum.  
3. Make sure that the power switch is set toOFF.  
4. The crossover should be set to10 o’clock position.  
- Frequency Response: 20Hz - 180Hz  
- Crossover Frequency: 40Hz - 130Hz  
- Crossover Slope: 12dB per Octave  
- THD: 0.001% @ 50 Hz.  
Connecting Your CP-8  
LOWLEVELINPUTCONNECTION  
- Input Impedance: 47,000 ohms  
- Input Sensitivity: 50mV to 2.3V  
- Power Supply: 115V/230V (50Hz~60Hz)  
- Fuse Rating: 1 Amp  
1. Locate the LINE INRCAon the CP-8 amplifier (Fig. 1F)  
2. Connect the CP-8 to the signal source, i.e. AV receiver. There is no  
need to have both RCAs to the signal source since the subwoofer is  
often operated in mono signal. If the receiver does not have  
adequate signal level, then you may want to use both RCA inputs in  
order toobtain higher signal level.  
3. If needed, connect the LINE OUT RCA(Fig. 1E) to another amplifier  
to drive satellite speakers (front or rear). The LINE OUT RCA has  
high pass filtered signal at about 70Hz (5dB/Octave cut off).  
SUBWOOFER  
HIGHLEVELINPUTCONNECTION  
The CP-8 has a HIGH LEVELINPUT connection (Fig. 1J). For the best  
performance, you might consider RCA connection if it is available on your  
source. Ifnot, then high level input will do.  
- 300 watts 8" subwoofer  
- 2" high temperature voice coil  
- Durable pressed paper cone  
- Long Excursion santoprene surround  
- 48oz high density magnet  
- 89dB 1W/1M  
1. Since bass is mono, you can connect the high level input of any of the  
front speakers to your CP-8. For ease of wiring, pick the speaker that  
is closest to the subwoofer. Simply piggy back a wire from the  
speaker tothe subwoofer and you’re up and running.  
Note: The high level input for satellite speakers is fitted with a high  
pass filter (70Hz). It is only powered when the main or front speaker  
signals are driven into the HIGH LEVEL INPUT (Fig. 1J). These  
terminals are marked with red and black to indicate the (+) & (-)  
respectively.  
2. Adjust the subwoofer low pass filter cut off to near 100Hz at first,  
slowly bring down the crossing point until you eliminate any  
emanating vocals from the subwoofer. An ideal crossing pint range  
from55 to70Hz.  
- FS: 38Hz  
- Qts: 0.516  
3. In case the CP-8 becomes out of phase with the satellite speaker, flip  
the phase switch to correct the problem (maximum bass is only  
achieved when the sub is in phase with rest of your speakers).  
(!) NOTE: DO NOT USE HIGH LEVELAND RCA INPUTS AT THE SAME  
TIME.  
SYSTEM  
- Dimensions (H - feet included x W x D):  
7” (177.8mm) x 12” (304.8mm) x 24” (601mm)  
Cautions  
- Weight: 24.58 lbs / 11.15 kgs  
(!) Do not place the subwoofer in an environment exposed to dust,  
excessive moisture or heat. Direct exposure to sun light will over time  
deteriorate the enclosure finish and may cause the amplifier to  
overheat.  
(!) To prevent electrical shock, never open the subwoofer cabinet before  
disconnecting the power cord from the amplifier's main socket.  
(!) In the event of a blown fuse, replace it with a 1 ampere fuse only. Over  
fusing voids the warranty and will destroy the amplifier.  
For more technical support, please contact us by:  
Phone: 1-800-576-7944  
3
 
CP-8 Installation Manual  
The ABC of Home Theater  
SPEAKERARRANGEMENT  
FRONTLEFT& RIGHTSPEAKERS PLACEMENT  
Home theater performance depends very much so on  
product performance, room size and speaker placement.  
Reading this booklet, following your priorities and these  
procedures will pay off with a big improvement to sound quality  
and sonic performance. Basics of speaker placement can help  
you make the smartest choice foryour specific room.  
In a home theater system, front speakers are responsible for  
movies’ sound tracks and dynamic actions. The front speakers  
need to sync the video event with the audio. For instance, when  
there is a moving vehicle from the left to the right of the screen,  
the sound should travel from the left front speaker to the right  
front speaker.  
There is no magic bullet in home theater, which is why this is  
called custom home theater. Every speaker has different sonic  
characteristics, every room has different acoustic properties,  
everyone's ears hear sound a little differently and your left ear  
has a different sensitivity than your right ear. So in the end, you  
may use this booklet as a starting guideline. However, when it  
comes to actually setting up your speaker system, let your own  
ears be the judge.  
In a two channel stereo system, the front speakers are  
responsible for producing all of the sound: staging, imaging, and  
depth of field. Placing the speakers too close to each other will  
compromise the stage, while placing them too far from each  
other will break the images.  
Front speakers should be placed at an equal distance from  
the TV and the primary listening spot (sweet spot). Together with  
the center channel speaker, they should form a slight arc with all  
three speakers at exactly the same distance from where you sit,  
as illustrated in Figure 2.  
CENTER CHANNELSPEAKER PLACEMENT  
To make life even easier, the distance between the front  
center channel speaker to the primary seat should be equal to the  
distance between the two front left and right speakers.  
This should be the first speaker you place in your home  
theater room. The job of a center channel is to anchor dialogue  
and other on-screen sounds to the screen. Thus, its position  
depends upon where you put yourTV.  
Place your center channel directly above or below your TV —  
centered, make sure the speaker's front edge is precisely aligned  
with the front edge of your TV screen. This helps in reducing  
distortion caused by sound reflecting and diffracting off the TV's  
cabinet.  
SPEAKER ELEVATION  
The tweeters from all three front speakers should have the  
same elevation as your ears while seated.Any deviation will work  
but it may reduce the performance.  
Make sure that there are no solid objects (like furniture)  
blocking the pathway of the sound traveling to your listening  
location.  
CENTER  
RIGHT  
LEFT  
C
A
B
A = B = C  
Figure 2. Front Speaker Placement  
If possible, the height of the center channel speakers should be  
as high as your ears in a sitting position, as illustrated above in  
Figure 2.  
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CP-8 Installation Manual  
SURROUND SPEAKER PLACEMENTS  
Surround speakers are there to envelop three dimensional  
sound that places you in the middle of the action. Ideally, your  
primary pair of surround speakers should be placed to the left  
and right of your listening position — either in line with it, or just  
behind it. They should form a 90°-110° angle with respect to your  
television. In a 6.1-channel or 7.1-channel system with more  
than two surround speakers, or if side placement is not available  
for your surrounds in a standard 5.1-channel setup, consider  
placement behind your listening position, facing the front of the  
room. Surround speakers should be placed high enough so that  
the drivers do not fire directly at your ears when you're sitting  
down.As a rule of thumb, place them at ear level while you are in  
standing position. Most people tend to over amplify the rear  
speakers. This is not recommended as it can over power the  
front speakers. Most of the time, the rear speakers are relatively  
quite.They simply come on when there are special effects.  
CENTER  
0°  
25° - 30°  
25° - 30°  
90° - 110°  
90° - 110°  
Since every room has different acoustics, you might need to  
experiment with the speakers aiming. You may get good results  
by pointing them at the ceiling or toward the rear corners of the  
room. If no side or rear walls are available for mounting your  
speakers, try placing a pair of traditional bookshelf speakers on  
speaker stands, slightly behind and to the sides of your listening  
position. Avoid aiming them directly at your listening position.  
You may also try any of our Sweet spot, IQ Series and Imãge in-  
ceiling speakers.  
CP8  
SUBWOOFER  
REAR CENTER  
Figure 4. Speaker Placement in 6.1 System  
Position the rear center speakers behind from the primary  
listening/seating spot and at about 6 feet from the floor.  
Placing the CP-8 subwoofer close to the listening/seating  
spot delivers more vibrations and subharmonics.  
Surround speaker placement which is ideal for home theater  
is not necessarily perfect for multichannel music listening, where  
a precisely focused rear sound stage is best. If both listening  
types are important to you, then you can position your surround  
speakers for a compromise between the two.  
CENTER  
0°  
CENTER  
25° - 30°  
25° - 30°  
0°  
25° - 30°  
25° - 30°  
90° - 110°  
90° - 110°  
SURROUND  
SURROUND  
90° - 110°  
90° - 110°  
LEFT  
RIGHT  
135° - 150°  
135° - 150°  
CP8  
SUBWOOFER  
CP8  
SUBWOOFER  
Figure 5. Speaker Placement in 7.1 System  
Position the left and right surround speakers at 90°angle  
and the left and right rear speakers at 135° - 150°angle with  
respect of the television and about 6 feet from the floor.  
Figure 3. Speaker Placement in 5.1 System  
Position the rear left and right speakers 90° - 110° across  
from the primary listening/seating spot and at about 6 feet  
from the floor.  
5
 
CP-8 Installation Manual  
SUBWOOFER PLACEMENTS  
A powered subwoofer delivers crucial impact in a home  
theater system although it is one of the least demanding  
speakers to position. Since low bass frequencies are omni-  
directional, you can usually place your subwoofer just about  
anywhere in your home theater room and still get good results.  
SUBWOOFER  
LFE  
Placing your subwoofer near a wall will generally produce  
more output due to wall reflection. Moreover, if you place your  
subwoofer in the corner, the output is maximized even moire.  
Keep in mind that even though the bass increases as you place  
the sub near a wall or corner, the quality of bass may be slightly  
"boomier" and less controlled. Thus, aim for a spot where you get  
a compromise between quality and quantity of bass.  
SUBWOOFER  
LFE+L  
SUBWOOFER  
LFE+R  
One cool technique for placing for your subwoofer is to put  
your sub in your listening spot (i.e. on your sofa), play some  
music, move around the room, and listen. Be sure that you bend  
down closer to the floor as you walk as this will lead to more  
accuracy as to what you will get. You will probably notice that the  
bass sounds a little bit different as you move around the room  
from one location to another. When you reach a spot where the  
bass sounds best, that may be the location where you want to  
place the subwoofer.  
SUBWOOFER  
LFE  
After finding the best subwoofer placement, you will need to  
set the phase. Earthquake subwoofers are equipped with 0° -  
180° phase control switch. Simply play one of your favorite  
songs and switch the phase control back and forth. You may  
need assistance from a friend or family member. Choose the  
setting that produces the most bass while all your speakers are  
playing.  
Figure 6. Four (4) CP-8 Arrangement  
More bass in the right places  
SUBWOOFER  
LFE  
Subwoofers have slower responses compared to the rest of  
the speaker systems. This is strictly Physics. The CP-8 is  
designed to address this issue. By making the CP-8 slim in  
profile, it opens up more placement options (i.e. under or behind  
the sofa, vertically standing against the wall in the corner of the  
room, etc.)tooffsetthe response delay.  
Figure 6 through 9 illustrate the bass response in the room  
when placing the CP-8 in different location of the room.  
Figure 7. Corner Loading Placement  
Ideally, place the seating about 2/3 of the room away from  
the television.  
6
 
CP-8 Installation Manual  
Trouble Shooting the CP-8  
LED DOES NOT LIGHT ON  
1. Check for the appropriate AC voltage in power outlet.  
2. Inspect the power cable. Never use one that has been altered  
with.  
3. Inspect the fuse(see Fig. 1H on page 2).  
The fuse holder slides outward. Simply use a flat screw driver to pry it  
open. Be sure to use the appropriate fuse size.  
SUBWOOFER  
LFE+L  
SUBWOOFER  
LFE+R  
LED TURNS ON BUT STAYS RED OR NO OUTPUT  
1. If LED does not turn green  
Unplug the power for 5 seconds. Position the power switch  
(Fig. 1Aon page 2) to ON and connect the power again. Turn  
the system on and check if the LED status change to green  
as it should do so when the amplifier is properly working.  
2. IfLED is green but there is no output  
Turn the power switch (Fig. 1A on page 2) to OFF position.  
You should see the LED turn red. Set the power switch to the  
AUTO (center position) and turn the audio source on. If  
signal were present at the RCA, you should see the LED  
status light turns green and the subwoofer will turn on and  
produce output. If LED remains red, then the problem is at  
the source or the audio cable:  
a. Trouble shoot the RCA cables by temporarily connecting  
them to the stereo left and/or right out of the source unit.  
Ifthe cables are good, the subwoofer must be heard.  
b. If the cables are okay but no sub out from  
receiver/processor, check the subwoofer settings at the  
source. Make sure “ON” or “Ultra” is selected (review the  
owner’s manual of the source unit for setting up the sub  
output).  
Figure 8. Two (2) CP-8 Arrangements - Seating Based  
Placing the two subwoofers on the horizontal axis of the  
seating area  
SUBWOOFER  
LFE  
HUM NOISE  
Unplug the RCAcables and check fornoise  
a. If the noise goes away, then the problem is at the source.  
Make sure that all units’ chassis are grounded together (~18  
-22AWGwire), with the exception toour subwoofer.  
b. Grounding the loop isolator (on the RCA side) and the  
cheater plug (on the AC supply side) may be a  
temporary/quick solution for such problem. However, we  
always recommend using solution a.  
c. Avoid using line conditioner or surge protector as it may  
damage the subwoofer’s internal circuitry.  
d. If the noise is still present even when the RCA cables are  
unplugged, try changing the AC outlet. If the problem still  
occurs at this point, contact an Earthquake technician.  
SUBWOOFER  
LFE  
For more technical support, please contact us by:  
Phone: 1-800-576-7944  
Figure 9. Two (2) CP-8 Arrangements - Seating Based  
Placing the two subwoofers on the vertical axis of the  
seating area  
7
 
Sound That Will Move You  
Earthquake Sound reserves the right to amend details of the specifications without notice.  
© Copyright Earthquake Sound Corporation  
Earthquake Sound Corporation  
2727 McCone Avenue. Hayward CA, 94545  
Phone: 510-732-1000 Fax: 510-732-1095  
 

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