Soundstream 102 Mode D'Emploi

In most car audio installations, there is a tendency for
a 

 boom.” Because of their interior dimen-

sions, most cars will resonate or ring at these 
frequencies. If we design the system so there is re-
duced output information in this region, the final re-
sponse is very smooth and  natural sounding.

The 

 & 302 incorporates staggered

electronic crossovers. The high and low pass portions of the crossover can be set
independent of one another.

The RUBlCON102, 202   302 come with a 

 Low Pass S.I.P. and a 

Hawkins and High Pass S.I.P. (Series In-line Package resistor network) If you are
using this amplifier in the Low Pass Configuration, you will
not need to change the S.I.P. crossover. If you are using the

amplifier in a 

configu-

ration we reccomend that you

180 NA

22

use a higher frequency 

120

N A

26

for your crossover.   order to

   

 

remove the factory Low Pass/

 

S.   P. (The 

 Then place the re-

maining 

 in the Low Pass socket. Make Sure

If you

want to use a frequency other than the factory pre-
set frequencies follow the chart to the left or the for-
mula below to select your own crossover points.

S.I.P.

Hawkins Bass Control (variable) is a unique subwoofer con-

trol circuit included with the Soundstream 

   

amplifiers.

It is capable of removing subsonic energy in pro-

gram material below 45 Hz at 12 

 while boosting

subwoofer frequencies. The circuit consists of two controls. One
engages a subsonic High Pass filter at 45 Hz, and the other
adjusts the amount of boost from 0 to 

 

 for the

RUBCON102). The Hawkins Bass Control functions on either
pair of channels 

 or 

 if their low pass filter is engaged.

The Boost control adjusts the amount of level applied at the
set frequency, and is adjustable from 0 to 

 

 (see figure 2).

When the boost is set to 0, Hawkins Bass Control acts as a sub
sonic filter only. The simple act of removing

potentially harmful low frequencies can im-
prove system output by as much as 3 

Subwoofer drivers in general have excellent
power handling characteristics over their
operational bandwidth. This bandwidth is 

termined by many factors, including driver
design, and enclosure type. It is possible to
overdrive any subwoofer driver by sending powerful signals outside of its opera-
tional bandwidth. These potentially damaging signals can be removed by adding
a subsonic filter. Figure 3 shows the effectiveness of the Hawkins Bass Control on
woofer excursion in a vented enclosure. The woofer travels 7.5 mm at 10 Hz. With

-15

-25

-3c

 

l 

 

1

FIG. 2 VARIABLE BOOST

Hawkins Bass Control

than 1 mm. This is of
output.

properly adjusted, this excursion can be reduced to less

great benefit to lowering woofer distortion and increasing

Adiustment
An-easy method of optimizing your exist-

 

ing subwoofer enclosure with 

Bass Control is as follows:

5.0

1.

Adjust the boost control to full counter
clock-wise (0) position.

2.0

2. Set the bass control switch to

 10 Frequency (Hz)

 

I

‘HAWKINS BASS CONTROL”.

FIG. 3 Limited Excursion

3.

4.

Play moderate to loud bass material.

Adjust the boost (Q) control until you reach the desired level.

With Soundstream’s Hawkins Bass Control, the boost and frequency control can

provide the “tailoring” needed for any type of “assisted” design and any woofer in
any type of installation.