Optimod-AM 9400 V1.2 Operating Manual - Orban
Optimod-AM 9400 V1.2 Operating Manual - Orban
Optimod-AM 9400 V1.2 Operating Manual - Orban
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OPTIMOD-<strong>AM</strong> DIGITAL OPERATION 3-23<br />
for various adult-oriented music formats where an easy, relaxed sound is considered<br />
more important than the highest possible loudness.<br />
MUSIC HEAVY is based on the Fast multiband release time. However, its tuning is very<br />
different from GEN HEAVY. It is tuned so that the AGC operates with a fast release<br />
time, doing most of the work in compressing the program. This gives more of a<br />
“wideband compression” sound than the other factory presets. Meanwhile, the<br />
multiband compressor is operated lightly with relatively little gain reduction so it acts<br />
more like a limiter than a compressor. Music Heavy is therefore an alternative to GEN<br />
HEAVY, providing a different “flavor” of processing. Either preset could be used to<br />
achieve a highly-processed sound with music programming.<br />
The GREGG preset is designed for general-purpose voice/music programming,<br />
particularly on music-oriented formats. Although not the loudest <strong>9400</strong> preset, it has a<br />
smooth, well-balanced quality that keeps audiences listening. We tuned it to sound<br />
very similar to the legendary Gregg Laboratories 2540 <strong>AM</strong> processor (designed by<br />
<strong>Orban</strong>’s Vice President of New Product Development, Greg Ogonowski, in the 1980s),<br />
using a direct A/B comparison with the Gregg processor to ensure accuracy. This preset<br />
uses a 200 Hz B1/B2 CROSSOVER setting.<br />
The PRESENCE preset, as its name suggests, emphasizes the spectrum around 3 kHz.<br />
It is a very loud preset that emphasizes speech intelligibility. It uses HARD bass clipping<br />
to maintain bass punch at the expense of some bass distortion. MW stations<br />
seeking to increase their coverage and to cut through co-channel interference are<br />
appropriate candidates for this preset.<br />
This preset is tuned for the typical narrowband MW radio and will sound shrill and<br />
unpleasant on wideband radios (of which there are very few in the market). If you feel<br />
that the preset has too much distortion, feel free to turn it down it with LESS-MORE to<br />
taste. The factory LESS-MORE setting is 9.0, so there is plenty of room to turn the<br />
preset down without seriously compromising loudness and coverage.<br />
You can also reduce the midrange boost if you feel this is excessive. Part of the boost is<br />
implemented in the Equalization section and part is implemented by the compression<br />
threshold controls, which are found in Advanced Modify.<br />
HF GENERAL is a 4.5 kHz-bandwidth preset for international shortwave transmission.<br />
In recognition of the severe noise and interference problems often<br />
encountered in HF propagation, the HF GENERAL preset has been ``tuned" to<br />
emphasize loudness and intelligibility. By comparison to the medium-wave-oriented<br />
presets, HF GENERAL has a more ``forward" midrange balance and less bass. This is<br />
because bass costs modulation without contributing proportional intelligibility (it<br />
also can make intermodulation distortion worse during selective fading), and<br />
because a boosted midrange can most effectively cut through noise to provide<br />
intelligibility.<br />
The 4.5 kHz bandwidth is coded into the preset, so the lowpass filter setting in the<br />
active Transmission Preset will be ignored.<br />
HF VOICE is a 4.5 kHz-bandwidth preset for international shortwave transmission.<br />
Compared to HF GENERAL, it emphasizes voice-range frequencies and has less bass.