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Author Topic: Dolby Cat64 or 64B ? Nic Dreier Film Handler Posts: 13 From: Basel, Switzerland, Europe Registered: Jan 2000 posted 08-20-2000 04:22 AM                     Hi there, Lately I checked our soundequipment, when I discovered, that there were two different types of the EQ-card (Dolby Cat64 and Cat64B) installed in the units. Does anyone know the difference between these two cards? Thanks for your help Best Regards Nic  |  IP: Logged Ari Nordström Master Film Handler Posts: 283 From: Göteborg, Sweden Registered: Jan 2000 posted 08-20-2000 02:44 PM                     Well, the 64B is a later model, with greatly improved filters and a (much) higher signal to noise ratio. The Cat 64's been around since the CP50, at least. I do believe that they are pin compatible, though (can anyone confirm this?), so if you can choose, take the 64B.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 08-20-2000 03:59 PM                        I'm quite sure that the 64 is interchangeable with the 64B. On the used market, there's a big price difference between original CP50s and upgraded ones (usually with the 108C preamp card, the 150E or F matrix, the 64B EQ cards, and maybe the 160 subwoofer card and 113C automation switch card).  |  IP: Logged Alan Lyman Film Handler Posts: 13 From: Copenhagen, Denmark Registered: Aug 2000 posted 08-21-2000 12:18 AM                     The two Cat's 64 are interchangeble. Please note though,that that the 64,has trimpots for level,and these should be adjusted when using it with SR-cards in a CP50.  |  IP: Logged Kevin Crawford Expert Film Handler Posts: 207 From: Sacramento, CA, USA Registered: May 2000 posted 08-21-2000 01:56 AM                     There is a new sub card for the CP 50. It is the CAT 560. Not only does it give a sub, but also split surrounds with a parametric EQ. I have not seen one, but I have talked to Dolby about it. It lists for about $500.  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 08-21-2000 04:03 AM                     Don't you have to do some major modifications to the backplane of a CP50 to use the 560? I am pretty sure its not plug-and-play... Aaron  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 08-21-2000 05:46 AM                     Yes, there are modifications to be done to the main board.  |  IP: Logged Bill Purdy Expert Film Handler Posts: 139 From: Seattle, WA Registered: Oct 1999 posted 08-21-2000 09:15 AM                        The Cat. No. 64 actually goes back much earlier than the CP-50. Not only was it used in the CP-100, but in the original Dolby Mono system. That is what the "Head Equalizer" adjusters are about. Dolby tracks didn't have the same curve as the old Academy curve and so they needed some extra HF tweaking. ------------------ Bill Purdy Component Engineering  |  IP: Logged Ken Jacquart Film Handler Posts: 82 From: San Francisco, CA, USA Registered: Mar 2000 posted 08-21-2000 09:29 AM                        Be aware that the Cat. No. 517 / 560 combination does not provide split surrounds while installed in a CP50. It does provide surround and subwoofer EQ of course. ken  |  IP: Logged Kevin Crawford Expert Film Handler Posts: 207 From: Sacramento, CA, USA Registered: May 2000 posted 08-21-2000 01:43 PM                     Ken what does the CAT 517 do?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 08-21-2000 02:58 PM                     The 517 is an upgraded version of the 117 output card. There are no new features. Ken, properly modified, a CP50 can run split surround with a second 117 in the spare slot with a direct JM11/JM21 digital loop. (Of course, I'm sure you were referring specifically to "unmodified" units.)  |  IP: Logged Chris Trainor Expert Film Handler Posts: 161 From: Greenville, RI, USA Registered: Jun 99 posted 08-21-2000 08:45 PM                        I've actually noticed that there are 2 different versions of the Cat 64B. One has the older style (rounded edge) trimpots and the newer one has the flat trims. I havn't found much difference in sound quality, but with just a quick look you can see if the board you have is one of the new 64b's as opposed to the original 64b. --Chris  |  IP: Logged Chris Trainor Expert Film Handler Posts: 161 From: Greenville, RI, USA Registered: Jun 99 posted 08-21-2000 08:46 PM                        Also, actually, when you use either the 517, or 560 there are mods you have to do to the backplane. Actually if you use both, there are some separate mods. I'm pretty sure Brad has the manuals online as to how to deal with them. It's not too tough, but it's a real pain in the neck to go back once you've made them.  |  IP: Logged Andrew Poulain Film Handler Posts: 13 From: San Rafael, CA, USA Registered: May 2000 posted 08-22-2000 03:41 PM                        The Cat No. 517 card has improved VCA/Line amplifers built into the card. There is an improvement in headroom and has lower distortion over the older Cat No. 117 cards. Additionally there is a treble boost for the screen channel speakers. This is good for sites that have older passive crossovers, or active crossovers without screen loss compensation. ------------------ Andrew M. Poulain Field Service Technician THX Division Lucasfilm Ltd. apoulain@thx.com 415-492-3955 Cel: 415-302-0825  |  IP: Logged Ken Jacquart Film Handler Posts: 82 From: San Francisco, CA, USA Registered: Mar 2000 posted 08-22-2000 09:19 PM                        Brad, now how are we going to sell any CP650's having revealed the secret mod to the CP50! ken  |  IP: Logged

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