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Author Topic: Do high-frequency speakers deteriorate over time? Or is it just my ears? Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-23-2014 08:12 PM                     Yes, the picture right below your question is.  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 03-23-2014 08:39 PM                        quote: Bob Ezra Mike- what model QSC screen speakers did you get and do you hear an improvement in dialogue? Yes, definitely a huge improvement. Plus the bass and directionality is improved with the baffle wall added. I love that we can play it nice and loud and people don't complain.  |  IP: Logged Bob Ezra Film Handler Posts: 75 From: Carbondale, CO, USA Registered: Apr 2001 posted 03-23-2014 09:57 PM                     Mike size of your room and # of seats? thanks  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 03-23-2014 10:37 PM                        35' wide, about 100 feet long and has 194 seats (44 of which are in the balcony). Mark - there are 12 surrounds (2 in the balcony) and they are the QSC wedge shaped ones. To be clear - the picture just below Bob's question is my theater and the one below that is the Hyart in Lovell, WY.  |  IP: Logged Buck Wilson Jedi Master Film Handler Posts: 894 From: St. Joseph MO, USA Registered: Sep 2010 posted 03-23-2014 11:41 PM                     That baffle wall has me thoroughly aroused. Glad to hear it made a big difference  |  IP: Logged Jarod Reddig Jedi Master Film Handler Posts: 513 From: Hays, Ks Registered: Jun 2011 posted 03-24-2014 03:37 AM                     Got me aroused too. Agreed more theaters need to be doing this. Cheer Mike and all others who made the right choice.  |  IP: Logged Bob Ezra Film Handler Posts: 75 From: Carbondale, CO, USA Registered: Apr 2001 posted 03-24-2014 08:11 AM                     QSC 322XC ... anyone?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-24-2014 08:45 AM                     I can't comment on its sound since I have not worked with it specfically (SC-322). The LF box is the same as their 400 series so it is well made, tuned...etc. The drivers on the LF-3215 are lower power and are clearly used as a low cost alternative to their more powerful drivers used in the LF-4215). The odds that the T-S parameters are identical between the two drivers are very slim so one should not expect the same response between the two (you can't get something for nothing). The HF section is the same as the 400 series HF so you are getting a similar response there. The passive crossover in this day and age should be avoided on design principles...more often than not they lead to driver failure if the system is driven hard. So, if are interested in obtaining a well made speaker that will work without bi-amping so long as it is operated with the specifications of the speaker (300-watts...which isn't very much at all), I have every confidence that QSC made a good quality product. Is your targeted room suited to this speaker? You haven't provided enough information to comment. It better be a smallish room though. Is it going to be as good as the SC-422 or the SC-423 (or the SC-424)...not a chance. QSC's 3-way and 4-way speakers are where they really shine. It seems that they started with the SC-423 and then modified that design down to create the smaller cousins. Sound wise, someone else has to comment on this model, including how well it tunes up in a typical cinema. I have not worked with it.  |  IP: Logged Bob Ezra Film Handler Posts: 75 From: Carbondale, CO, USA Registered: Apr 2001 posted 03-24-2014 11:09 AM                     Steve Thanks for that. Room is 24x70 (1680 sq ft)- baffle wall behind screen. Currently JBL 4638 Lf with 2385A horn - Qsc 1400 amps. Not looking for huge sound but better dialogue intelligibility  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-25-2014 09:49 AM                     My suspicion is that turning is where your problem mostly lies (or bad room acoustics). The 4638 is a decent LF system. It is the low-powered version of the 4648...same box, lower powered drivers...if it has the "TH" in the name, then the crossover is cut into the box. The 2385 is actually a decent choice for your room since it is a 60x40...you have a long-narrow theatre and the 60x40 horn will keep the energy off of your walls better than a traditional 90x40 horn. The downside is that it is the small format horn and it will have poor pattern control below 1000Hz. I was never a big fan of the 2380 series. The 2360 series did MUCH better but they also were 3-feet deep. Before throwing money at a new speaker...I would really look at the tuning, crossover and room acoustics. If you are going to buy new speakers and dialog is an issue...consider saving a bit more and look into the QSC SC-423 ...they are 3-ways (good ones) and will be horn loaded down to the 300Hz range. You'll need to, at least, bi-amp them but you'll have a chance of improving the dialog with this speaker. Going to another passive speaker with a wider dispersion is likely to make things worse. In fact, if QSC made their MF/HF in a 60x40 version, I'd recommend that. Note too, you could save money by reusing your LF section since that is NOT where your problem is. Note, at a 70-foot room, you should have over 650-watts available to the LF section alone (disqualifies the SC-322 and all SC-300 series immediately).  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-25-2014 12:00 PM                     Bob, Before you do anything you should get your self new amplifiers. If not DCA's then at least the RMX's. The 1400's are reliable but a very old design with old semi's and old IC's with poor slew rates. You would be amazed at the increase in definition as well as high frequency extension when you install new amplifiers. For many of my customers just installing new amplifiers was the equivalent of rolling up a window shade that was seemingly in front of the screen. You also won't really be taking advantage of any new speaker's full performance with those old 1400's. And for D-Cinema you really should have more headroom anyway. I have installed four sets of the 322's that I recall so far and in rooms about your length but narrower. They work well however, the dialog on the three way systems is much better IMHO, even the dialog intelligibility of the little SC-2150 which I have installed a few sets of in small rooms would blow you away. When I opened the first SC-322 upper section and saw how small they are I shook my head thinking these will never work.... But they turned out to be awesome. Mark  |  IP: Logged Bob Ezra Film Handler Posts: 75 From: Carbondale, CO, USA Registered: Apr 2001 posted 03-25-2014 11:07 PM                     Steve- The room has been tuned by a highly qualified guy and acoustics are a problem. I am in the process of ordering acoustic panels for the rear wall, hoping for an improvement. Your analysis of my speakers was interesting and helpful. Mark- thanks too for your input  |  IP: Logged Jarod Reddig Jedi Master Film Handler Posts: 513 From: Hays, Ks Registered: Jun 2011 posted 03-27-2014 08:34 PM                     Do you have any pics of the room?  |  IP: Logged

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