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DIY JBL 4645 Sub project - Page 2

post #31 of 37
Thanks for sharing that info with regards to your drivers and horns! I am not familiar with those particular Selenium compression drivers. Those horns look huge! I think that Bob Crites uses a clone of the JBL-2380 horn in his CornScala designs, but, I could be mistaken. I am not sure if it would even be possible to use a Be diaphragm with the 2445's, but, if they are similar to the 2447 or 2446 then I am sure you could add a Be diaphragm. If you were to do that then you could probably ditch the Selenium super tweeters as the Be diaphragms would extend the compression drivers breakup to a higher frequency. Anyway...nice freaking setup! I bet that is an incredible sounding setup for theater usage!
post #32 of 37
JBL 4675 cabinets are in popular use around Hollywood in film mixing/ post production studios. However more times than not the JBL compression driver on the 2360 horn has been replaced with a BMS 4590 coaxial driver. The BMS driver nicely extends the high end.
_____________
Best Regards,
Carl Huff
post #33 of 37
Quote:
Originally Posted by KenWH View Post

Here's a few pics Scott...

They look like they mean business and they do. wink.gif


-Ken

Hey, Ken. Thanks! I thought I had recognized you and your gear. I love your room!

You're doing what I'd like to be able to do in my room and put full sized side and rear surrounds using JBL Pro components. Not sure if you looked but my system has JBL cinema stuff and at one point I was going to use a trio of 2445's (and still have them) but later on changed to another different compression driver system. At some point when or if I have such a large room I want to do something similar to what you have done. I'm sure it sounds great!
post #34 of 37
Quote:
Originally Posted by Carl_Huff View Post

JBL 4675 cabinets are in popular use around Hollywood in film mixing/ post production studios. However more times than not the JBL compression driver on the 2360 horn has been replaced with a BMS 4590 coaxial driver. The BMS driver nicely extends the high end.
_____________
Best Regards,
Carl Huff

Yes, Carl, you are correct in that a BMS-4590 would be a great option. But, yesterday I spoke via phone to a guy had had used both the BMS-4594 and the similar sized JBL with a Be diaphragm, and this guy said that the differences between the two in terms of SQ are so close that it really makes it tough to pick between the two. According to him, and take this for what it's worth, but, he said that the Be diaphragms in the JBL's seemed to have a more crisp and detailed , and more revealing top end. Now granted, you or I may not like that, but, if it were me, I would go with the Be diaphragm + JBL.
post #35 of 37
Quote:
Originally Posted by Martycool007 View Post

... if it were me, I would go with the Be diaphragm + JBL.

I agree!

Be diaphragms in JBL 2446 CD bodies is what I am running on my IWATA 300's. And before someone asks, previous to the Be's I was using a pair of BMS-4590 CDs. That's not to say the BMS-4590 isn't good. It's in fact very good! But I personally prefer the Be phragms in a JBL body. I am using the BMS CDs on 2360 horns in my shop system.
_______________
Best Regards,
Carl Huff
post #36 of 37
Quote:
Originally Posted by Carl_Huff View Post

I agree!

Be diaphragms in JBL 2446 CD bodies is what I am running on my IWATA 300's. And before someone asks, previous to the Be's I was using a pair of BMS-4590 CDs. That's not to say the BMS-4590 isn't good. It's in fact very good! But I personally prefer the Be phragms in a JBL body. I am using the BMS CDs on 2360 horns in my shop system.
_______________
Best Regards,
Carl Huff

I'd like to try out my 2445's with Be's some day. redface.gif
post #37 of 37
Quote:
Originally Posted by LTD02 View Post

i've mentioned it before, but that is one heck of a theater.

for some reason, i kept going back to the picture of the screen because it looks like your screen is glowing...then i see it is a retroreflective hp, so it is! any issues with it at that large size and material type?

Sorry to not have replied sooner on the screen ?...

Yah that retro effect is cool...you think a flash makes it glow...you should see that sucker lit up with good black light lol. It looks like a giant light fixture. cool.gif

Back when I was screen shopping there was not a lot of good info available about using the HP material for home theater use...i was a bit hesitant to go with it but man am I glad I did. I have not experienced any problems at all with the HP screen...it's been one of the best investments I've made yet.

When I upgraded from my old light cannon Sanyo PLV-60 (installed way back in 2002) to the JVC RS-1 I knew I'd be needing some gain over my painted wall screen. Enter the Da Lite HP. I went from a 118" painted wall screen with the PLV-60 to the 133" HP with RS-1. Even though the RS-1 doesn't have the light output of the Sanyo...the image was far brighter and had more pop with the RS1/HP combo. Also the RS1 destroyed the lcd based Sanyo when it came to contrast and resolution.

The only issue I had was that since the HP is a retro reflective screen, in order to maximize brightness, I had to ditch the ceiling mount for my pj. I ended up moving the pj to the closet and mounting it so it shoots right over your head when seated. If you look at my pics you can see the trimmed-out square hole in the back wall. It worked out great as it also eliminated all the fan noise issues I had from the ceiling mounted pj...it was a win-win all around.
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