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Author
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Topic: Qsc DCM
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John Gordon
Film Handler
Posts: 62
From: Earth
Registered: Jul 2000
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posted 03-10-2003 06:24 PM
Antonio,
Did you have trouble with the download of the DCM software, or are you having issues with your computer? I can see from Tom’s post, there should be no issue with running XP.
Yes indeed, the DCM is a DSP based crossover, with time delay, parametric EQ, screen EQ, CD horn EQ, HPF for subs with a choice of Q settings, and it comes with a booth monitor as well. And of course it works well with or DCA amps as you have noted with the simple hook up via our DataPort connector (VGA style connector).
You can get DataPort cable from us in lengths of 1ft, 2ft, 3ft, 4ft, 5ft, 6ft, 10ft or we can do customs lengths as well. But Gordon, if you choose to make your own cables, you can do that as well.
Gordon, I will have to disagree with you on the “uploading common settings into multiple screens” in one respect. If you tune a room with the DCM and you have similar size rooms, with same speakers, etc, you can indeed upload the information from the tuned room as a starting point to speed things up. But of course you should tune each and every room. The uploading of common settings is only a starting point.
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John Gordon
Film Handler
Posts: 62
From: Earth
Registered: Jul 2000
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posted 03-11-2003 01:06 PM
Nothing good comes easy, hmmm? I have to disagree, to a point of course. Take VGA cables for example. They are widely used in highly critical computer applications, and they were easy to install. And for the past 3 - 4 years, our DataPort cables as well as VGA style cables have been used with the QSC DCM and DCA amplifiers. To my knowledge, there has never been an issue with the use of our DataPort cables, or a VGA style cable.
Now, if someone has a preference for a certain type or brand of cable, more power to them. If someone prefers to make custom cables, that is fine as well. But, there is nothing wrong with using a good quality VGA style cable. We have accessory DataPort cables for use with the DCM Crossover/Monitor and DCA amplifiers--as well as for our networking components--and anyone can purchase them if they desire. You can also pick up VGA style cables at your favorite electronic outlet, though you must make sure the cable has all 15 pins.
Things you may want to consider regarding VGA style cables:
Any of the D-Shell connectors are far better cables than most standard audio cables. This includes VGA cables. Reasons?
1) The shell of the connector is guaranteed to make contact before any conductor does, greatly reducing the chance of static discharge into the audio system.
2) The connector itself is far more robust than most standard audio cables.
3) In general, VGA cables are designed to carry signals of much higher bandwidth than audio. Video contains much higher frequency content than audio, and the VGA cable works great for monitors.
Now, we do understand that audio quality can degrade if the cable length of a standard VGA cable gets longer than about 2 meters. QSC has engineered an audio specific VGA cable for longer runs, or where extremely high audio performance is required. The QSC Custom DataPort cable individually shields the audio signals from a DCM (or other DataPort equipped piece of hardware) to the amplifier. This shielding is in ADDITION to the normal heavy duty shield around the entire cable. So, we end up with two individually twisted pairs, each pair shielded from the other, and the other 11 DataPort signals. All of these signals are then shielded from outside interference. The result? Pristine audio quality.
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John Gordon
Film Handler
Posts: 62
From: Earth
Registered: Jul 2000
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posted 03-11-2003 01:30 PM
Antonio,
Regarding your “type mismatch” issue. The reason for this is more than likely the region coding of periods and commas. I’m assuming you have your region options set to Italian. If you want to open the DCM Manager software, here is two simple ways to do so:
1) In Control Panel, click on “Regional Options.” On the General tab, change the “your locale” to “English (United States).”
or
2) In the “Regional Options,” if you are set for Italian, you can click on the Numbers tab, change “Decimal symbol” to a period (.), and change “Digit grouping symbol” to a comma (,).
In either case above, you may want to make sure you put your Regional Options settings back to their original settings when finished using the DCM software.
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Mark Gulbrandsen
Resident Trollmaster
Posts: 16657
From: Music City
Registered: Jun 99
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posted 03-13-2003 06:12 AM
"Now, we do understand that audio quality can degrade if the cable length of a standard VGA cable gets longer than about 2 meters."
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John,
That line in your reply makes me want to question the use of them even more.....
If a good quality VGA cable cannot pass audio and remain acceptable on runs of more than 2 meters thats not doing too good. Now it really has me thinking that these cables are marginal performers!! Because a cable is good at high frequencies doesn't necessarily mean it will work well in an entire different bandwidth situation, a situation that the cable was not designed for in the first place. It may be adaquate, but adaquate is not good enough for me, nor is it for the perspective customers I would be selling expensive systems to.
I certainly like the quickness associated with them but it all still leaves me feeling a bit negative on the whole thing due to what is looking more and more like questionable wire. Also just because Protools has facilities built in for using DB connectors, and or VGA cables for audio doesn't mean its the best route to go when cabling up a system, or designing a piece of audio gear. I have no problem with DB connectors for audio use, except that they are not sturdy, and can be difficult to wire up. Hard wiring is still IMHO the most effective quality oriented route to go. Had Phoenix connectors been implemented at least along with DB connectors on alot of really nice "high End" cinema audio gear that has appeared of lately I'd feel a bit better about it all. To each his own then.
It seems retro-progresive that there are a number of fine designs appearing using this built in cabling bottleneck. Using DB to Phoenix adaptors is another possibility but more connectors can also lead to more problems, and systems that are simply not sturdily built.
Mark
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