HELIX H 500 ESPRIT Instruction Manual page 4

most speakers.
Parametric equalizer of the HXA 500 ESPRIT
The H 500 ESPRIT amplifier features a highly innovative
integrated parametric equalizer for the subwoofer amplifier.
This means a wide range of possibilities for individual adapta-
tion of the subwoofer. Besides the H 500 ESPRIT has an inte-
grated subsonic filter 26 Hz/ 30 dB Oct.
25 Setting the center frequencies
Control 25 can be used to select a frequency of
50 - 150 Hz on the preset low-pass frequency band (see
control 14). This center frequency can be raised using con-
trol 26, by between 0 and 9 dB. This is desirable if certain
frequencies of the subwoofer are to be enhanced (kick
bass) or corrected. (see Fig. 3)
26 Level control for raising the cut-off frequencies
This control enables the center frequency set at control 25
to be raised from between 0 and 9 dB. (see Fig. 4)
27 Band width adjustment
Control 27 can be used to enhance the Q of the frequency set at
control 25. The resultant band width can be infinitely varied from
10 to 110 Hz. (see Fig. 5) The bandwidth remains
constant if the centre frequency (control 25) is changed.
28 Phase Control
This control enables the phase of the bass signal to be shif-
ted by 180° in order to achieve optimum delay equalizati-
on with the other channels. (see Fig. 6)
Fig. 1: Control No. 14
Important notice!
Incorrect adjustment of the parametric equalizer can have a
considerable deleterious effect on sound quality. In such
cases, consult your BRAX/HELIX dealer. If this is not
immediately possible, turn controls 25 to 28 completely
counter-clockwise so that the subwoofer amplifier operates
in the linear mode.
29 - 31 CPS-Colour Protection System
The LEDs show the operation status of the amplifier. Green
(control 29) = O.K.; yellow (control 30) = the speakers
wires are shorted to ground; red (control 31) = over heated.
If the amp shuts off due to overheating it will take some
time (depending on the outside temperature) until it swit-
ches on again.
32 Bridge selector
To run the satellite channels A+B and C+D in bridged
mode, the control 32 must be setted at position B and con-
trol 9 at position 2. The signal inputs 8+7 and level controls
10+13 have to be used as input. If the variable modules
HCC 3 - HCC 6 are inserted and the amplifier is running in
bridged mode the controls (HP+LP) which turn to the out-
put transistors, are in operation.
Important notice: The impedance in bridged mode
must not be lower than 4 ohms!
Technical specifications see page 16
Fig. 2: Control No. 15
Fig. 3: Control No. 25
Fig. 5: Control No. 27
5-channel connection
+12V
Ground
Remote
Fig. 4: Control No. 26
Fig. 6: Control No. 28
Subwoofer Amp In-/Output
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