Filter
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7.0 SOFTWARE OPERATION
Smooth adjustment
Whenever a parameter is changed, VNET™ will assess the likely impact on the signal path, and will intelligently smoothly ramp
to the new value, or mute for a short time if the change could otherwise cause any undesirable sound to be reproduced.
Power ON & OFF
At the bottom left hand corner of the control panel there is a power button. Activating this button will shut down the amplifier.
The DSP section remains active.
Saving & Recalling Data
Device Data may be saved to disk or opened from disk.
PodWare Device Data files (with file extension .dse) contain all the data necessary to restore a device to exactly the same
state as when the file was saved.
If the current settings have been changed since the last file save or file open, the Save Icon on the toolbar will be shown in
solid colour. If the settings are already safe, the Save icon appears grey.
If a file is opened when on-line to devices, the new data will be sent to the device, overwriting whatever was in the device. A
warning will be given before this is done.
Data saved from one device can be reopened in another to save time inputting data. (Assuming settings are to be duplicated)
Podware will always try to protect your data, warning you if you are attempting an action that could cause loss of data.
7.0 SOFTWARE OPERATION
Audio Processing
VNET™ provides the following processing options:
• • Crossover filtering with frequency variable over the range 10Hz to 25kHz (and ‘Out’) with the following alignments:
• 1
st
order
• 12dB/Octave Bessel
• 12dB/Octave Butterworth
• 12dB/Octave Linkwitz-Riley
• 18dB/Octave Bessel
• 18dB/Octave Butterworth
• 24dB/Octave Bessel
• 24dB/Octave Butterworth
• 24dB/Octave Linkwitz-Riley
The Low band has a low-pass crossover filter, and the High band has a high-pass and a low-pass crossover filter.
• A 2
nd
order low-shelf filter with frequency variable over the range 10Hz to 25kHz, and boost/cut from –15 to +15dB.
• A 2
nd
order high-shelf filter with frequency variable over the range 10Hz to 25kHz, and boost/cut from –15 to +15dB.
• Eight bands of bell (parametric) equaliser, each band having frequency variable over the range 10Hz to 25kHz,
bandwidth variable from 0.1 to 5 octaves, and boost/cut from –15 to +15dB.
• Delay adjustable up to 200ms.
• Adjustable gain from –30 to +15dB, and mute.
Equalisation Filters
The eight Bell filters (Parametric equalisation filters) may each be used to emphasise (by applying a positive Level parameter
setting) or de-emphasising (by applying a negative Level parameter setting) a range of frequencies centred on the setting of
the Frequency parameter, and encompassing a frequency range determined by the Bandwidth parameter setting.
The two shelving filters allow all frequencies below that of the frequency parameter (for the Low shelf) or all frequencies above
that of the frequency parameter (for the high shelf) to be emphasised (by applying a positive Level parameter setting) or
de-emphasised (by applying a negative Level parameter setting).
Crossover shapes
In addition to the usual Butterworth, Linkwitz-Riley and Bessel filter shapes, VNET™ processing provides access to Hardman
crossover filtering. Hardman filters produce much steeper cut-off slopes for a given order than conventional crossover alignments,
without any additional group delay. This allows a lower order filter to be used without sacrificing cut-off characteristics, but with
smoother group delay and less severe phase penalties, giving a more natural sound. Hardman filters and also provide identical
phase characteristics between adjacent bands (like Linkwitz-Riley), so the polar performance is rock steady
We also employ phase matching on our Bessel filters, so adjacent bands are in-phase throughout the crossover region.
Protection (factory optimised)
Comprehensive protection features preserve the longevity of the amplifier by continuously monitoring several critical parameters,
and reducing the gain, or muting the amplifier either temporarily or permanently depending on the nature and seriousness of
the fault or misuse. The amplifier will recover and restart if at all possible, but will remain shutdown if a serious fault persists
(such as a permanent short circuit on the output).
Minor faults are dealt with by slowly ‘dimming’ the amplifier, reducing the level to a sufficient degree and for a sufficient time
that the amplifier is able to recover gracefully without any user interaction. When the fault condition has passed, the amplifier
will slowly fade up to normal.
More serious faults may cause the amplifier to mute while it recovers, after which it will automatically re-energise and fade
up, again without user interaction. If such a fault is found to be persistent however, the amplifier is shut down permanently,
flashing its limiter indicators rapidly in unison. A power cycle by the user is then required.
Any time the amplifier is being protected, the limiter indicator will flash rapidly.
During power-up, VNET™ will keep the amplifier muted for a short time while checks are made that all is well. During this time,
the Indicators will both be solidly on. The signal is then gently faded up, accompanied by rapidly flashing Indicators.
16 17
TM
8.1: UPDATING FIRMWARE
Occasionally it may be necessary to update the devices firmware (with file extension .dfw); this may be due to added features
or amendments to the VNET™ product. Check with your dealer/distributor or (www.tannoy.com) for any applicable updates.
Firmware can be updated over the network (no need to disconnect speakers from the network)
A firmware update will be common to all VNET™ products (one file for all models).
Updating a devices firmware is straight forward:-
1. Download and save the new firmware file to disk.
2. From the toolbar select ‘Device’ & ‘Start Firmware Loader’
3. The following message will appear
4. Click ‘OK’
5. Browse to the new firmware file & select. The following message will appear stating the old version number &
the replacement version number.
6. Click ‘OK’
7. In order for the new firmware to take effect the unit has to be switched off & back on again. This can be done
automatically after the update. Click ‘OK’ to confirm.
8.0 SOFTWARE OPERATION 8.0 SOFTWARE OPERATION