Snell Acoustics Speaker System SR30THX User Manual

Surround Speaker System  
Owner’s Manual  
SR30THX  
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SR30THX FEATURES  
1 Hand-tuned crossover  
6 Matrixed midranges for switchable direct/diffuse  
sound  
2 Recessed side-firing tweeter for best diffuse sound  
3 Front-firing tweeter for best direct sound mode  
7 Input terminals with removable jumpers for easy  
7.1 upgrades  
6.5" (165mm) dual-voice coil bass unit  
8 Truss bottom panel  
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5
Toggle switch for convenient surround mode selection  
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2
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SR30THX  
FEATURES OF THE  
Unique Cabinet Design  
SURROUND  
Hand-Tuned Crossover  
A sealed enclosure above and a unique matrix array below  
project sound in three distinct polar patterns. The truss panel  
bottom reduces the detrimental effects of standing waves  
within the cabinet.  
The filter network is optimized to provide a smooth and flat  
power response in diffuse mode. Each crossover is tuned by our  
technicians to 0.5dB of the Master Reference, assuring pre-  
dictable performance in your home. Furthermore, a sophisticated  
switching network enables the SR30THX to perform in any  
application.  
Speaker Elements  
Three 1-inch aluminum-dome tweeters cover frequencies  
above 3kHz. Two 3.5-inch (89mm) extended-range drivers are  
responsible for frequencies between 400Hz and 3kHz. One  
omnidirectional 6.5-inch (135mm) dual-voice coil bass unit  
handles all frequencies from 60Hz to 400Hz.  
Mounts to Walls  
Our unique locking bracket keeps the SR30THX securely mounted  
to walls. One person can install the SR30THX simply, securely,  
and easily.  
Family of Sound  
Connectors  
The SR30THX ’s are tuned with a flat, optimized power response,  
to match the spectral balance of Snell front speakers. The use of  
common Snell driver units and careful optimization provide a  
direct mode frequency response that is an excellent match with  
Snell front speakers.  
Five-way gold-plated binding posts allow quick connection to  
speaker cables and connections. Furthermore, removable jumpers  
accommodate the use of SR30THX in 7.1 channel applications,  
now or for future system upgrades.  
HOW TO PLACE YOUR SR30THX SURROUNDS  
Theory of Operation  
Placement  
Today, surround speakers are called upon to do one of two  
disparate tasks. For some movies, you may want a surround to  
create an all-enveloping diffuse field. Sound should arrive  
at your two ears by bouncing numerous times off of all your  
listening room walls.  
Although often mistakenly referred to as rear speakers, your  
surround speakers should ideally be placed to the left and right  
of the listening area. In the diffuse mode, internal switching  
converts the radiation pattern of the super surround to a fore  
and aft radiating dipole (see Figure 1A). This null will reduce the  
amount of direct sound at the listener’s ears. The radiation along  
the length of the room will maximize the reflected sound heard.  
For this reason, the speakers should be placed so that the  
listener is within the null of the speaker. Efforts were made to  
widen the angle of the response null so that the ”phasiness”  
of regular dipoles and their critical positioning requirements  
were reduced.  
Conversely, with multichannel music, you may want the musical  
stage to widen beyond the front speakers by having a spread of  
five near-identical speakers over a semicircular arc around you.  
You may want movie effects to pan solidly off the screen and to  
the sides. This demands the side speakers to be well matched to  
your front speakers both in frequency balance and in their more  
focused directional characteristics.  
Proper room placement is perhaps the most important factor  
contributing to home theater sound quality. Take a few minutes  
to place your speaker system correctly to ensure that it sounds  
its best.  
Until now, surround sound speaker designers had to choose  
between satisfying one requirement or the other, or perhaps  
choosing a middle-ground compromise. The SR30THX provides  
a choice of surround sound modes, allowing performance to  
be tailored to program material.  
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HOW TO PLACE YOUR SR30THX SURROUNDS (CONT. )  
Fig. 1A  
Placement (cont.)  
Switch set to Diffuse-THX Ultra2 Response  
Listening Room Placement  
Follow these guidelines for proper placement.  
(Refer to Ideal SR30THX Placement diagram.)  
Height  
Place the surrounds at least 5 feet (1.5m) from the floor, yet  
12 inches (30cm) from the ceiling. Higher is better.  
Fig. 1B  
Switch set to Direct Response  
Placement  
On the side walls, center surrounds to the listening area.  
Boundaries  
Keep the surrounds at least 12 inches (30cm) away from an  
adjacent wall or a large obstacle.  
7.1 Mode Placement  
This option provides the greatest flexibility for speaker place-  
ment. Please use the 7.1 Mode Placement diagram and 7.1 radia-  
tion patterns (Fig. 1C), as guidelines for placing the SR30THX ’s.  
Keep in mind as you move the speaker forward or backward from  
the seating area, you are actually aiming a section (or half) of  
the speaker at the listeners and creating a more direct sound  
field. The other section of the speaker will be aimed at the rear  
or front wall, thus creating a diffuse sound field for that  
channel.  
Fig. 1C  
Switch set to 7.1 Mode (Jumpers Removed)  
Coverage Area  
In larger spaces, we recommend using one surround speaker  
system for every three rows of seats (approximately 10 inches  
between surround speakers).  
Ideal SR30THX Placement for Direct/Diffuse Response  
7.1 Mode Placement  
Approximate  
region for  
7.1 usage  
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WALL MOUNTING YOUR SR30THX SURROUNDS  
The SR30THX is mounted via a unique slide-on mounting plate. The  
plate is first screwed to the wall at the appropriate position and  
Mounting on Wood and Other Solid Surfaces  
then the speaker slides down, firmly locking in place. The plate must Use the supplied 2-inch #8 particleboard screws. For best results,  
be mounted with the long groove toward the wall and the notch at predrill the hole with a 1/8-inch drillbit.  
the bottom.  
Mounting on Masonry, Adobe, and Similar  
The enclosed mounting template will guide you in locating the  
mounting screws. In addition, it will ensure the minimum  
clearance to the ceiling as required by the mounting bracket.  
Surfaces  
Consult a knowledgeable installer about proper hardware. You  
will obtain best results with #8 screws.  
Please Note  
Installation of surround speakers requires a thorough under-  
standing of construction tools and procedures. We recommend  
you consult a knowledgeable installer if you are unsure of the  
physical properties behind your walls.  
Mounting the Bracket When Using the  
Machine Screws and Toggle Wings  
1. Drill two 9/16-inch (13mm) holes using the included template.  
If running wires behind the wall, make a hole for them as well.  
2. Insert the machine screws through the bracket and thread  
onto the toggle wings before penetrating the wall.  
3. Level the bracket and tighten screws.  
Mounting on Drywall, Paneling, or Other  
Hollow Surfaces  
Use the supplied 3-inch #10 machine screws and toggle wings.  
The toggle wings require a 9/16-inch (13mm) hole. Do not  
attempt to mount the SR30THX ’s to drywall with any of the  
commonly available plastic anchors (push-in inserts).  
4. Guide the wires through the back.  
5. Place the SR30THX on the bracket and slide down until you  
hear a locking ”click.”  
6. Connect the wires.  
CONNECTING THE SR30THX SURROUNDS  
For Five-Channel Applications (including THX systems)  
receiver or amplifier  
left  
right  
Select either surround mode with the toggle switch. When used  
with a THX receiver/processor, please select the "DIFFUSE-THX  
ULTRA2 MODE".  
left center right  
surround surround  
Connect a set of speaker cables to either set of inputs. You may  
want to consider running a second set of speaker cables for each  
surround if you think you may upgrade to a 7.1 channel system  
in the near future.  
left  
surround  
speaker  
right  
surround  
speaker  
left  
speaker  
center  
speaker  
right  
speaker  
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CONNECTING THE SR30THX SURROUNDS (CONT. )  
For Seven-Channel Applications  
Select the diffuse surround mode with the toggle switch.  
Remove the gold jumper bars from the inputs.  
Connecting with Bare Wire  
Insert bare wire into holes and  
tighten.  
Connect the two sets of speaker cable to the appropriate  
7.1 channel inputs.  
Connecting with Banana  
Plugs, Spade Lugs, or Pins  
receiver or amplifier  
The binding posts accept standard banana plugs and pins, and  
can accommodate spade lugs up to 5/16 inch.  
surround  
side  
side  
left  
rear  
left  
rear  
right right  
left center right  
Warning! To prevent electrical shock, always switch off the  
amplifier or receiver when making connections to the speaker  
system.  
Operation and Use  
SR30THX  
The diffuse mode is most appropriate when the inability to local-  
ize sound is desirable. This should be perceived as a ”wall-of-  
sound.” Music with side channels encoded with hall effects will  
produce a feeling of envelopment. Surround encoded baseball  
games will be heard as if the stadium were all around, with no  
clear source of off-the-field, realism-enhancing effects.  
left  
right  
surround  
speaker  
surround  
speaker  
left  
speaker  
center  
speaker  
right  
speaker  
Optional Relay Control  
If you have purchased an SR30THX with relay control (or an  
upgrade kit), the speaker's default setting is "DIFFUSE-THX  
ULTRA2 MODE" = 0 Volts  
Both music and movies will have instances when either ”direct”  
or ”diffuse” surround sound will suit. Music recordings with  
musicians in the side channels will most likely sound best in  
”direct” (refer to Fig. 1B). However, if the side channels are used  
to record the performance environment or audience sounds, the  
”diffuse” mode may be best.  
When a 12VDC control signal is applied, surround mode is  
switched to "DIRECT MODE". Two unpolarized cables with .110"  
terminals are provided at the rear for this purpose  
Surround Processor Settings  
Similarly, with movie soundtracks, some producers will use side  
channels to pan discrete sources off-screen (e.g., jet fly-bys, etc.).  
This material will be well served with the ”direct” mode. Other  
movies will use the side channels to transport you to a remote  
environment with street noises, crowd noises, etc. These may be  
best reproduced in ”diffuse” mode.  
When using a subwoofer:  
Select the SMALL or NORMAL surround setting on your receiver  
or processor. This routes all bass information (typically below  
100Hz) from the surrounds to your subwoofer.  
When not using a subwoofer:  
Select the LARGE surround setting on your receiver or processor.  
This routes all bass information to your surrounds.  
The surround mode switch is conveniently located under the  
right side of the grille to allow easy access. Swing the right side  
of the grille outward to reveal the switch. It is located midway  
up the cabinet within the matrix driver recess. Refer to the  
switch diagram (on the top-right panel of the speaker) and the  
figures to determine the appropriate setting. SR30THX provides a  
unique experience with its ability to produce multiple polar pat-  
Match the Sound Levels of Each Speaker  
Your home theater system most likely includes a test signal that  
simplifies level matching. Refer to the instructions provided with terns. You should take some time and experiment to best adapt  
your surround sound electronics. this surround speaker to your listening habits.  
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HOW TO CARE FOR YOUR SR30THX SURROUNDS  
u
Do not use abrasive cleaners or any cleaner containing chemi-  
cals harsher than those found in glass cleaner.  
Cabinet  
Your speaker system has been finished with either a black or  
white paint. Multiple layers of paint, along with hand sanding  
between each coat, provide a durable and smooth finish.  
Grille Cloth  
u
You can remove the top and front grilles from the speaker  
system and gently vacuum to remove dust.  
u
To clean, use a soft terry cloth towel slightly dampened with  
water or a mild detergent. The towel should be just damp  
enough to wipe the surface clean without leaving a trail of  
moisture.  
LISTENING LEVELS AND POWER HANDLING  
The power recommendation for the system assumes you will  
operate the amplifier in a way that will not produce distortion.  
All speakers can be damaged by a modest amplifier if it is  
producing distortion. If you hear a gritty noise or other signs  
of strain, turn down the volume. Prolonged or repeated opera-  
tion of your speakers with a distorted signal can cause damage  
that is not covered by the warranty.  
LIMITED WARRANTY  
For five years from the date of purchase, Snell Acoustics will  
repair for the original owner any defect in materials or work-  
manship that occurs in normal use of the SR30THX ’s without  
charge for parts and labor.  
If Service Seems Necessary  
Contact the dealer from whom you purchased the speaker  
systems. If that is not possible, call us at 978-373-6114, or  
write to:  
Snell Acoustics  
Your responsibilities are to use the product according to the  
instructions supplied, to provide safe and secure transportation  
to an authorized Snell Acoustics service representative, and  
to present proof of purchase from an authorized Snell dealer in  
the form of your sales slip when requesting service.  
143 Essex Street  
Haverhill, MA 01832  
We will promptly advise you of what action to take. If it is  
necessary to return your speaker system to the factory, please  
ship it prepaid. After it has been repaired, we will return it  
freight prepaid in the U.S. or Canada.  
Excluded from this warranty is damage that results from abuse,  
misuse, accidents, shipping, repairs, or modifications by anyone  
other than an authorized Snell Acoustics service representative.  
This warranty is void if the serial number has been removed  
or defaced.  
This warranty gives you specific legal rights, and you may also  
have other rights that vary from state to state.  
143 Essex Street  
Haverhill, MA 01832  
phone: 978-373-6114  
fax: 978-373-6172  
Manufactured under license from Lucasfilm Ltd. U.S. patent number 5,109,416. Foreign patents  
pending. Lucafilm, THX and Ultra 2 are trademarks or registered trademarks of Lucasfilm, Ltd.  
Snell Acoustics. All Rights Reserved.  
©2002  
email: info@snellacoustics.com  
Specifications are subject to change without notice.  
Part #542-1006-1  
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