Budget Eminence Coaxial surround build!!! - Page 16 - AVS | Home Theater Discussions And Reviews
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post #451 of 1048 Old 12-17-2013, 02:33 AM
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Just curious what kind of spl can you get out of a Eminence 10" coaxial?

They cost about 200 dollars for me in Australia. I like the 18 Sound 8" Coax (8CX400F) myself. I have looked at the Beyma 8" XC20 and 10" XC25 coaxial also and have not decided which to use. I will be using mine for a SM80/SM100 like build. I am hoping I can get some real SPL out of them while being within safe zones. At the same time I could use mine as main speakers when using them inside. I don't have the room as most of you do so 8" might be the way to go for me. Late to the party but thought I would comment anyways.
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post #452 of 1048 Old 12-17-2013, 07:49 AM - Thread Starter
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Hey dude biggrin.gif Scott and I were looking at mid 120's on the beyma neo model we are working on. I would hope that is sufficient biggrin.gif

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post #453 of 1048 Old 12-17-2013, 04:12 PM
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The Beyma is the one I want to hear more about. Give us some details, Beast!
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post #454 of 1048 Old 12-17-2013, 04:29 PM
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120's is good. I have not simulated anything and Beyma and 18 Sound I can generally get for the same price at USSpeakers but already here in OZ. Will call to make sure on the price of the Beyma.(XC20) Really like the XC25 but need to remember I have a budget. But when its only a little bit more money its hard to resist.
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post #455 of 1048 Old 12-17-2013, 08:33 PM
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(A few of you may have seen me post this in a different thread, but I'm going to throw it up here as well...mainly so somebody buys these damn things so they stop tempting me! biggrin.gif )

Speaking of coaxial surround speakers that can hit 120's, if you can fit these JBL 322C's into your room you cannot go wrong for the price you can get them for! The 2407h CD JBL uses in this model is actually a BMS 4540nd (a $150 driver by itself). I'm using these with Yorkville U15 Unities that also employ a BMS CD (4550) at the center of the Unity horn -- they match very well with their SQ and 124 dB output.

I can vouch for the seller's product; don't personally know him, but I have 6 of these from two other sellers out of Las Vegas that come from the same source...they were all from a local auction of a sound company's assets that were liquidated. Some of mine have 'LVAC' (Las Vegas Athletic Center) written on them, and I also got some 12" Tannoys that are apparent overstock from the VooDoo Lounge; which is kind of cool. smile.gif I had emailed the seller a few months ago and he said he would take $200+shipping per speaker -- after picking up 6 of these and 9 12" Tannoys recently for a bit less, I had to show some restraint. biggrin.gif

I had pointed these out to GPMBC a few months ago as a great match to his U215's, but I think he figured they were too big -- a 3 cu.ft. box is spec'd for them...not exactly small, but they work great mounted flush in my bonus room walls with attic space on each side.

The goal here is not to detract from what Erich is doing with his awesome project, but to point out what I feel is a great deal on some kick-ass coaxial surrounds...(and to hopefully have somebody snatch them up so I stop feeling the urge to do so.)

Gorilla, you out there? wink.gif
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post #456 of 1048 Old 12-18-2013, 08:04 AM - Thread Starter
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The Beyma is the one I want to hear more about. Give us some details, Beast!

Tracking Number: 1z1**************

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post #457 of 1048 Old 12-18-2013, 10:41 AM
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I'm not sure how loud the Eminence models will get, but would a surround ever need to come near 120db?
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post #458 of 1048 Old 12-18-2013, 10:45 AM - Thread Starter
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Quote:
Originally Posted by Erich H View Post

I'm not sure how loud the Eminence models will get, but would a surround ever need to come near 120db?

Deep rooms you could see something needing to get to 120. My rear wall is at 29 feet, so I need the ability for the rear surround speaker to be able to play at reference, from 5m...105dB ref + 15dB loss = 120dB.

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post #459 of 1048 Old 12-18-2013, 11:07 AM
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I really don't know how theaters are set up when it comes to needed output, but don't the rear channels need less output than the mains? If you're playing at reference, would the system itself ever require the surrounds to play at that level compared to what the front is doing?

When MTG90 and I were listening to one of these in my living room we nearly had to scream at each other to talk. And I don't think we were anywhere near 120db because I wasn't pushing them with a dedicated amp, just a powerful receiver.
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post #460 of 1048 Old 12-18-2013, 11:08 AM
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I forgot, how do you determine the loss of spl based on distance?
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post #461 of 1048 Old 12-18-2013, 11:17 AM - Thread Starter
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Quote:
Originally Posted by Erich H View Post

I really don't know how theaters are set up when it comes to needed output, but don't the rear channels need less output than the mains? If you're playing at reference, would the system itself ever require the surrounds to play at that level compared to what the front is doing?

When MTG90 and I were listening to one of these in my living room we nearly had to scream at each other to talk. And I don't think we were anywhere near 120db because I wasn't pushing them with a dedicated amp, just a powerful receiver.

You probably weren't, but movies are mixed to around 85dB average, with 105dB peaks at the seating location being the THX required performance and mixing standard. If you are listening at 0.0, then that is what you should expect from the speaker. In order for me to get that at my MLP 5 meters away, the speaker will be playing right near 120dB's at the speaker. Add in some headroom, vwallah, you need a speaker that can realistically do 120dB's smile.gif

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I forgot, how do you determine the loss of spl based on distance?

6 dB per doubling of distance, for a point source speaker. "Live" rooms this loss won't be as drastic, but a well treated room you will be pretty close. Line array's only lose 1dB per meter, and as such is a benefit of using such a design.

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post #462 of 1048 Old 12-18-2013, 12:32 PM
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Quote:
Originally Posted by Erich H View Post

I really don't know how theaters are set up when it comes to needed output, but don't the rear channels need less output than the mains? If you're playing at reference, would the system itself ever require the surrounds to play at that level compared to what the front is doing?

When MTG90 and I were listening to one of these in my living room we nearly had to scream at each other to talk. And I don't think we were anywhere near 120db because I wasn't pushing them with a dedicated amp, just a powerful receiver.

I can't imagine needing surrounds to be able to play at 120dB, for fun a few weeks ago I decided to put in some ear plugs and crank my system to +5. With my SPL meter I was hitting 118dB, it was insane loud. There is no way I could watch a movie at those levels. Although its nice to know that a surround could play at those levels without distortion.

I have all of my speakers calibrated to 85dB at my LP.
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post #463 of 1048 Old 12-18-2013, 12:38 PM
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Thx Beast
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post #464 of 1048 Old 12-18-2013, 02:25 PM
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Originally Posted by jbrown15 View Post

I can't imagine needing surrounds to be able to play at 120dB, for fun a few weeks ago I decided to put in some ear plugs and crank my system to +5. With my SPL meter I was hitting 118dB, it was insane loud. There is no way I could watch a movie at those levels. Although its nice to know that a surround could play at those levels without distortion.

I have all of my speakers calibrated to 85dB at my LP.
Yeah, and that was with all of your speakers, not just one.
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post #465 of 1048 Old 12-18-2013, 08:00 PM
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Only reason I wanted a coaxial to play at 120 or above was because I would use them as mains and outdoor speakers like a SM80.
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post #466 of 1048 Old 12-18-2013, 11:52 PM
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Both the 8" and 10" should be able to do close to if not a little more then 120dB with enough power (300-400w). They are around 94-95dB sensitive.
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post #467 of 1048 Old 12-19-2013, 06:54 AM
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mtg is this with the Eminence woofer and DNA CD?
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post #468 of 1048 Old 12-19-2013, 06:56 AM
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mtg is this with the Eminence woofer and DNA CD?

Yes, I asked him about it yesterday.
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post #469 of 1048 Old 12-19-2013, 07:30 AM
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Quote:
Originally Posted by mtg90 View Post

Both the 8" and 10" should be able to do close to if not a little more then 120dB with enough power (300-400w). They are around 94-95dB sensitive.

Nice...

Flat down to what again? 80? 100?
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post #470 of 1048 Old 12-19-2013, 07:37 AM
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What did the price come out to be for the 8 or 10" Erich?
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post #471 of 1048 Old 12-19-2013, 12:46 PM
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$130 and $135, respectively, according to the current prices shown on the web site.

Beta 8CX -3dB @ 80Hz

Beta 10CX -3dB @ 90Hz


Added links and low end extension...
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post #472 of 1048 Old 12-22-2013, 05:03 PM
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Erich has the kits up on his website now!! WooHoo!!!
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post #473 of 1048 Old 12-22-2013, 05:08 PM
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Yep, already ordered four.
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post #474 of 1048 Old 12-22-2013, 05:11 PM
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How about posting a link to Erich's site
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post #475 of 1048 Old 12-22-2013, 05:18 PM
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post #476 of 1048 Old 12-22-2013, 05:58 PM
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Thanks, gpmbc and HopefulFred,

What are they called and where are they listed?
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Volt
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post #478 of 1048 Old 12-22-2013, 06:42 PM
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mhutchins,

I saw your tilted cabinet design. Are you still going with that? I'm thinking about doing the same. What will be the differences, sound wise, between the 8" and 10" systems?
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post #479 of 1048 Old 12-22-2013, 07:25 PM
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Quote:
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Erich has the kits up on his website now!! WooHoo!!!

Very cool but I'm going to keep waiting for a cabinet that has an angled baffle. If one will eventually come out. Then I'll order three pairs. biggrin.gif

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Yep, already ordered four.

Nice!

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post #480 of 1048 Old 12-22-2013, 08:15 PM
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Quote:
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mhutchins,

I saw your tilted cabinet design. Are you still going with that? I'm thinking about doing the same. What will be the differences, sound wise, between the 8" and 10" systems?

Yes. I plan to build some small ~.4 Ft^3 enclosures and mount them on swivels so I can experiment with the optimum baffle angle for time/intensity trading and stereo imaging. I figured I would place them up on the wall/ceiling intersection where I plan to run them and connect them as mains while I experiment with down angles. Once I find angles that work, then I will make the final enclosures as .5 ft^3.

I have no idea what the differences would be for 8" vs 10" in terms of sound quality or bass extension.

I ordered a pair of 10's earlier this evening. biggrin.gif

Mike
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