Martin Audio iK41 handleiding
Handleiding
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It applies attack and release characteristics to go some
way towards modelling the complex thermal circuit of a
driver’s voice coil and magnet assembly.
There are three parameters:
▪ Threshold – The continuous RMS voltage which the
driver should be able to withstand. This is calibrated
at the output of the amplifier. You can switch off the
thermal limiter by setting the threshold to off.
▪ Attack – The time-constant of the speed at which the
driver heats up (in seconds).
▪ Release – The time-constant of the speed at which
the driver cools down (expressed as a multiple of the
attack time).
To update thermal limiter settings
1. Press
OUTPUT to select the channel. For details, see
Selecting the output channel (page 24).
2. Press the down arrow button ▼ several times until
Tmax appears top left (usually five presses).
3. Rotate ADJUST (the right-hand dial) to change Thresh
the threshold value. To switch off the thermal limiter,
rotate the dial to the right until O appears.
4. Rotate SELECT (the left-hand dial) to choose Attack
and rotate ADJUST (the right-hand dial) to change the
attack value (0.01 to 34.4s).
5. Rotate SELECT (the left-hand dial) to choose Rel and
rotate
ADJUST (the right-hand dial) to change the
release value (1.0X to 16.4X).
6. Press UTILITY to exit the menu or press OUTPUT
several times to step through the channels.
Output excursion limiter
Use the Xmax menu item to update the excursion limiter
settings. This is one of three output limiters (page 25) in
the amplifier.
The excursion limiter protects the driver against excessive
linear movement of the cone and voice-coil which
could otherwise cause mechanical damage. Since this
movement (excursion) is largely related to the inverse of
the signal frequency, drivers are prone to being damaged
by very low frequencies. This limiter is progressively more
sensitive at lower frequencies and, rather than varying
the gain to provide the limiting action, it uses a sliding
high pass filter to progressively curtail the low-frequency
response, effectively limiting the linear excursion to below
the Xmax specification of the driver.
To set the limiter up, it is necessary to know the shape
of the family of Excursion versus Frequency curves of the
driver for various drive voltage levels. A curve should then
be chosen where the slope is high, where it passes though
the specified Xmax value for the driver. The peak voltage
and frequency of this point should then be noted.
The Xmax limiter is usually then set up using just two
parameters:
▪ Threshold – the peak voltage of the point arrived at
above. This is calibrated at the output of the amplifier.
The Excursion Limiter can be defeated by setting
Threshold to Off.
▪ Frequency – The frequency at which the above
threshold voltage is appropriate.
A further parameter
Min may also be available for more
advanced applications. This allows the increasing limiting
action at lower frequencies to level-off below a certain
frequency. In most application, this would be left set to its
default value of 5Hz.
To update excursion limiter settings
1. Press OUTPUT to select the channel. For details, see
Selecting the output channel (page 24).
2. Press the down arrow button ▼ several times until
Xmax appears top left (usually six presses).
3. Rotate ADJUST (the right-hand dial) to change Thresh
the threshold value (1 to 201V or O).
4. Rotate SELECT (the left-hand dial) to choose Freq
and rotate ADJUST (the right-hand dial) to change the
frequency (10 to 1,000Hz).
5. Press UTILITY to exit the menu or press OUTPUT
several times to step through the channels.
Bridge mode
If you select bridge mode, two amplifier channels drive
one loudspeaker with greater power. In this mode, only
one set of output controls is active per pair of amplifier
channels since both of the amplifiers in the pair are driven
with the same signals, as determined by the left-hand
(lower numbered) channel of the pair. Bridge settings
should be set up before recalling Drive Module presets.
Module Preset Recall will see a bridged pair of outputs
as a single channel. When Bridged, the partner (even
numbered) channel doesn't show any signal on the limiter
meter, though the amplifier protection indicator does
still operate. For this channel, the mute button doesn't
iK41 User Guide
26
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Productinformatie
| Merk | Martin Audio |
| Model | iK41 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 8458 MB |
