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Bolt to a clean chassis point in the vehicle. 18. +12V Connected to a fuse or circuit breaker, then to the battery’s positive terminal 19. FUSE Main power supply fuse. Warning: Replace only with the same value fuse! 7 The RUBICON amplifiers incorporate an on-board staggered electronic crossover, with RCA outputs to drive an external amplifier. No external electronic crossover is necessary. The high and low pass portions of the crossover can be set independently of one another. To engage the High Pass filter, set the left crossover switch on the top of the amplifier to “H.P. X-OVER”, and use the frequency adjustment knob marked “H.P. X-OVER”. To engage the Low Pass filter, set the left crossover switch to either “SUB SONIC” or “HAWKINS BASS CONTROL” (see pages 1 O-1 1 for more details), and set the right crossover switch “L.P. X-OVER” to the “IN” position. Cros Crossover .L P HP XOVER-73 192 Hz XOVER HA’NWS l 30 70Hz SLBSCNC l 13 30Hz I ’ blF~R7%N~ Do not have the law Pass filter and the High Pass filter buth engaged at the same time. While this won’t damage the amplifier, the frquency range of the amplified signal will be severJ’y limited. . In many car audio installations, there is a tendency for a “midbass boom.” Because of their interior dimensions, most cars will resonate or ring at these midbass frequencies. If we design the system so there is reduced output in this region, the final response is very smooth and natural sounding. The high pass cossover is independently variable from 70 to 160 Hz at 12 dB/Octave, and the low pass crossover is independently variable from 55 to 220 Hz at 24 dB/Octave. For initial crossover setup, try setting the low pass filter to approximately 60 Hz, and the high pass filter to approximately 100 Hz. Change the crossover points to accommodate a good mixture of frequency response, power handling, and personal preference. 12 d6Dctave High Pass 24 dB/Octave Low Pass 9 su8 rlTml KVER SONIC HAWKINS BASS CONTROL r HAWKINS 1 FREQ FREQ BOOST 110 Hawkins Bass Control (parametric) is a unique subwoofer control circuit included with the Soundstream RUBICONSM, 702 and 1002 amplifiers. It is capable of removing subsonic energy in program material while boosting subwoofer frequencies. The circuit consists of two controls. One adjusts the frequency of operation and the other adjusts the range of boost. With both controls adjusted fully counter-clockwise, no boost is applied and the amplifier is flat in response down to 20 Hz. FIG. 1 BASS CONTROL 10 The frequency control (Hz) adjusts 5 the starting point of the subsonic fil-0 ter. On the RUBICON502,702 and dB -5 -10 1002, the high pass filter has two fre--15 quency ranges. When the bass con--20 trol switch is set to “SUB SONIC”, -25 -30 the high pass filter frequency can be adjusted from 13 Hz up to a maximum of 30 Hz. In this setting, no 10 boost “Q” control is available. This 5 control is useful for setting the low-0 est frequency that your subwoofer dB -5 -10 will see (see figure 1). When the -15 bass control switch is set to -20 “HAWKINS BASS CONTROL”, the -25 high pass filter frequency can be ad--30 justed from 30 Hz to a maximum of 70 Hz. In this setting, there is an available boost control of 0 to +9 dB. 10 1 I I The Boost control adjusts the amount 5 of level applied at the set frequency. 0 This is adjustable from flat (OdB) to+9 -5 dB -10 dB. (See figure 2) -15 -20 When the Boost is set to 0, Hawkins -25 acts as a sub-sonic filter only. (See I I I IIIIIII 1 -3010 Frequency (Hz) 50 100 200 figure 3) The simple act of removing FIG. 4 VARIABLE BOOST potentially harmful low frequencies can improve system output by as much as 3 dB. (see figure 4) 10 lOFrequency 50 100 200 FIG. 2 VARIABLE “Q” 10 Frequency(Hz) FIG. 3 VARIABLE HIGH PASS Application 80 70 excellent power handling character-60 istics over their operational band-5.0 Subwoofer drivers in general have (,?I$0 width. This bandwidth is determined 30 by many factors, including driver de-20 IO sign, and enclosure type. It is pos 0.0 10 Frequency(Hz) 50 100 200 sible to overdrive any subwoofer FIG. 5 LIMITED EXCURSION driver by sending powerful signals outside of its operational bandwidth. These potentially damaging signals can be removed by adding a subsonic filter. Figure 5 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 Hawkins Bass Control properly adjusted, this excursion can be reduced to less than 1 mm. This is of great benefit to lowering woofer distortion and increasing output. Adjustment An easy method of optimizing your existing subwoofer enclosure with Hawkin’s “Hz” control is as follows. 1. Adjust frequency and boost control to full CCW position. 2. Set the bass control switch to “HAWKINS BASS CONTROL”. 3. While listening to music with strong bass content at a moderate level, slowly adjust frequency control clockwise. Listen for a reduction of bass response. Now, rotate frequency co...

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