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This topic comprises 2 pages: 1 2
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Topic: RTA's
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Mark Gulbrandsen
Resident Trollmaster
Posts: 16657
From: Music City
Registered: Jun 99
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posted 06-23-2000 10:01 PM
There is only one choice if you want a standard to go by. THX R-2! Hands down. I have used 6 different analyzers over the last 18 years. They were the old Altec CRT based analyzer(actually an H-P and my first one and still one of my favs), Ivie IE-30(great,but not durable), Audio Control, Klark Teknik, and I now own an Ivie PC40 and a THX R-2. The thing about the R-2 is that it is an analyzer that is capable of accurate, repeatable results. Few others can do this. The sound difference in systems eq'd with it is astonishing. I have done everyting with it. Altecs, HPS, JBL, EV, you name it. My customers have always been impressed with the results and that speaks for itself. There are other 4 mic systems(Ultra Stereo for instance) but they do not automatically match the level of the 4 mics as the R-2 does and this is very important so the system can make accurate measurements. The R-2 is extremely versitle and reliable. The PC-40 was a purchase I made just before I bought the R-2. Its a good analyzer and does a few things the R-2 can't and I also like it for "A" chain work and dubbers cause its alot more portable and allows going through a bunch of "A" chains quickly. The band pass filters in both the PC-40 and the R-2 are exceptional.
Mark
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Rory Burke
Expert Film Handler
Posts: 181
From: Burbank, CA, USA
Registered: Jun 2000
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posted 06-25-2000 05:26 PM
I think that the R2 is the most versatile RTA out there. It is more than capable of handling any senario for instalation, testing and Research purposes. I have found it quite usefull in doing STC studies in my auditoriums, finding room modes, and other acoustical testing including the RT-60 reverberation test which is so crucial for ensuring dialogue inteligibility. I typically run my R2 on my laptop in DOS mode only from start up. I avoid running dos under windows because i have experienced faults and communication errors in the past. The R2 software is reliable in the Dos only mode. I recently became aware that THX is now offering a calibration kit for the countryman microphones that come with the R2 kit. About time!!! I have to often calibrate them and was wondering how the THX engineers calibrate their mics.
Barry: I also use the terra sounde tool box and have compared it to my R2. Not a bad unit for $800 bucks and it does RT-60 too!!! I like the terra sounde beacause it's light weight (bout 1 lb), user friendly, accurate(subjective), illuminated screen for dark operation, cost, upgradability and adaptability(for specific uses like studio work etc)
Still for tunning an auditorium, nothing beats four mics and the accuracy of the R2 (AS LONG AS MICS ARE CALIBRATED!!!!!)
Gordon: Have you used the RT-60 decay analysis for your line of work?
Remember no matter what RTA you use..one still needs to implement proper signal strength, gain structure, and Eq techniques.
The audio control Ivie and other RTAs out there are also fine but some lack some functions which limit its uses like 4 microphone multiplexing, RT-60, time averaging and others. I have found that the R2 is very useful in doing an A-chain as well. With the slit illumination test film you can ensure that you LED is properly centered with the analog camera ans check you analog signal strength as well.
There are other RTA that are commin about which seem promising as well. www.spectraplus.com offers a free 30day trial of their software based RTA which uses your laptop's sound card for the RTA. All you need is a mic/mics, cable, and or a multiplexor. I have a sofware ocilloscope program whichalso uses my laptop's sound card. Technically i can have all my a-chain and b-chain equipment, tools and all, iu one light weight laptop case. I hope to enjoy this forum and to be capable of contributing helpful information like many others out there as well.
Rory Burke
"nothing like a 7k bulb with a three bladed shutter"
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(company property). so I am in the market for a new or used one. Has anyone used an Audio Toolbox by terraSonde and if so what is/ was your impression of it
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