Enjoyment
Guide
for the
ELT PBS
(Powered Base/Stand)
Yours exclusively through
2150 W. 6th Ave. • Suite L • Broomfield, CO 80020 • Toll Free 1-877-543-7500 • e-mail : info@av123.com
The PBS is very versatile and offers
many methods of connection. Below we
detail how to connect the PBS to systems with and without a subwoofer in
use. You can also design your own connection scheme; you are not limited to
those listed here!
Receiver / processor configuration
(Note: This document assumes you are using the
PBS’ with your main speakers.)
Option one:
Set your receiver or processor to MAIN speakers
= LARGE. You may need to adjust the SUB setting in your receiver or processor to say ENHANCED or MAINS + SUB or something to that
effect. This ensures your sub will be working in
tandem with the woofers in the PBS.
Option two:
If you receiver or processor offers very low
crossover points to the sub, you can try setting
your MAIN speakers as SMALL but with a 30 or
40Hz crossover. Set your SUB to YES. This will
give you a lot of low bass in your PBS’s but not
the lowest of the low. You may prefer this to
option one but it's user dependant. If you tend
to play your system at reference levels (very
loud!), this is probably your best option.
If you have a subwoofer...
Take the speaker cable from your amplifier or
receiver and plug it into High Level inputs on the
back of the PBS amplifier. Next take the supplied jumper cable and go from the High Level
output terminals to the binding posts on the back
of the speaker.
If you do not have a subwoofer...
Connect the speaker cable coming from your receiver or processor to the speaker as you normally would.
Use the subwoofer out with the PBS. If you have
only one sub/LFE out, split the signal (with a Ysplitter such as the Revelation product we have)
and run one cable to each PBS amplifier. Connect the cable to the Line Input 'R Mono'.
Set your receiver or processor MAIN = SMALL.
Set SUB = YES.
PBS Amp Controls
Adjust the PBS controls the same for
either connection method:
Adjust the controls on the back of the PBS amp
to your liking. The left-most knob is frequenc y.
This controls the highest frequency that the
woofer will be playing. Most like it around 120Hz
but experiment and see what you like.
The switch below is phase. To properly set this,
you need to perform a frequency sweep. If you
don't know how to do this, refer to the next section in this manual. Basically, you want to use
the setting that provides the loudest output as
well as the flattest response.
The final knob is gain (volume). Set this so that
you get a nice 'foundational' bass lift but not too
much that it's over powering. Start around 12
o’clock and adjust from there. Play several dif-
ferent CD’s and DVD’s. You want the system to
sound balanced; like the PBS is part of your main
speaker with a seamless blend between the two.
Phase Adjustment
The phase switch (see AMP DRAWING) controls
the relative phase of the woofer to best reinforce
the other loudspeakers in your system. Adjustments to this control will change the PBS’s interaction with the rest of your speaker system, providing the least cancellation, and thus the best
response in any room. With SPL meter in hand
(or, better yet, on a tripod), play an 80Hz tone
(for this exercise the crossover point must be set
to 80Hz). Be sure not to play your system too
loud for this exercise. Start with the phase control in the "0" position. Record the reading on
your SPL meter. Repeat with the switch in the
“180” position. Select 0 or 180 based on which
position results in the biggest peaks in sound
pressure levels (i.e. reads highest on the meter).
This setting indicates the least amount of bass
wave cancellation, and should be held constant
until the subwoofer or other speakers in your
room are moved, or placement is altered in any
way. With typical front corner placement in most
rooms, you may very well find the "0" setting to
be optimum. Ideally, you should play test tones
from 30Hz through 150Hz with the phase set to
0 and 180 and use the best setting for the range
of frequencies.
Performing a Frequency Sweep
Though there are a number of ways to perform an
accurate frequency sweep, we’ve detailed the
steps involved in the most basic method below.
a. Sit in your favorite seat and hold your Ra-
dio Shack SPL meter at a 45-degree angle
half way between horizontal and vertical.
b. The meter should be placed at ear level
when seated in the primary listening position, and is best if supported by a stationary object such as an end table or tripod.
c. Set the control on the meter to ‘C-
weighting’ and ‘slow’.
d. Assuming you have already calibrated all
channels to reference level (see the
owner’s manual for your main speakers or
receiver/processor for how to do this), the
PBS should be calibrated to 75dB (or 85dB
if your receiver/processor uses that standard).
e. Play a 31.5Hz (or 32Hz) track from a test
tone CD, such as "Rives Audio Test CD 2
available through www.rivesaudio.com
and record BOTH the frequency, which corresponds to the track on the test disc, and
the sound pressure level (volume) as
shown on the meter.
f. Next, play the tracks from 30Hz to 150Hz
and record the sound pressure level for
each frequency played.
Important Note: The Radio Shack sound meter
uses C-weighting which compensates for the lower
sensitivity of the human ear at low frequencies.
We want to measure the actual SPL. The Rives
test disc mentioned earlier automatically compensates for C-weighting. If you use a different test
disc that does not automatically compensate for
this, a correction key is needed to ensure proper
response before your final measurements are
plotted. We suggest gathering your data using
the readings on the meter and then correcting
your results with the compensation coefficients
shown at the end of this manual.
"
,
Proper Care and Feeding
Your Rocket PBS does not need much exterior
maintenance other than an occasional dusting.
Please use care with the gloss black finish or real
wood veneer and treat it as you would a car or
piano finish. The gloss black can be waxed with
automotive carnauba wax if desired. For general
dust removal, we recommend the 3M Yellow Detail
Cloth (part # 39016) or Meguiar’s Ultimate Wipe
Detailing Cloth (part# 29910) as it will not scratch
the black surface or real wood veneer. Additionally, the durable matte finish on the wood veneer
requires only some dusting, or can be wiped off
with a water dampened soft cloth if needed.
Above all, listen and enjoy!
AV123 Warranty Policy and Registration
All products sold through AV123 carry a limited
manufacturer's parts and labor warranty. All
Rocket Outdoor Series loudspeakers are guaranteed to be free from manufacturer's defects for a
period of one year from the date of purchase.
Get an extra two years of warranty coverage free!
When you go online to www.av123.com and register your product, we will extend the warranty by
an additional two years - that's three years total.
This extended warranty is free simply for registering within 60 days of your purchase. We urge you
to take advantage of this offer. Warranties apply
to the original owner only and are nontransferable. AV123 will exchange all defective
merchandise, including shipping charges, to the
original shipment destination at no charge for up
to 60 days after the date of purchase.
After 60 days the product must be returned to
AV123 for repair only and return shipping costs
are the responsibility of the customer. All questions should be directed to customer service.
Specifications
Type: Acoustic suspension, single-driver system
Driver: 8" custom composite cone woofer
Frequency Response: 33 Hz—150Hz +/- 2 dB
Size (W x D x H): 7.5" (add 3" when including
the base) x 9" (add 1" for amp protrusion or 1.5"
when including the base) x 28.75". The top area
is 7.5" W and 6 11/16" D
Weight: 35 lbs.
Other Features:
8” woofer is high passed at 31Hz
0-180 phase adjustment, gain, and
crossover adjustments (40Hz-150Hz)
LFE summed R/L RCA input
Auto-on / standby mode
Radio Shack Compensation Chart
The below shows the correction values for the SPL
meter mentioned earlier in this manual. For any
number read (left column) from this meter, it is
necessary to add the correction value (right column) before plotting actual results.
Frequency
(Hz)
20 +7.5
25 +5
32 +3
Gain
(dB)
40 +2.5
50 +1.5
63 +1.5
80 +1.5
100 +2
Thank you for your support!
2150 W. 6th Ave. • Suite L • Broomfield, CO 80020 • Toll Free 1-877-543-7500 • e-mail : info@av123.com
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