Budget Eminence Coaxial surround build!!! - Page 25 - AVS Forum
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post #721 of 895 Old 02-10-2014, 07:22 PM
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Originally Posted by mac_hs10 View Post

If you mount the 18* speaker lower , it would aim at the right seat. or tilt the top out a little to make up for the 2 degrees

I'm well aware of what happens when you mount the speaker lower. My room is 12ft wide and I have my current speakers mounted at about 6.5ft, I can't mount them any lower. Not to mention how much harder that would make it for people to get into the second row of seats.

At this point if only a 16 or 18 degree option is offered I think I'll just build the boxes myself and look at ordering just the baffles if they are offered. I would also assume that anyone else with a room around the width of mine will have the same issues.
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post #722 of 895 Old 02-10-2014, 07:27 PM
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Originally Posted by Erich H View Post

In that case, it might be better to not use any angled box at all. I wouldn't want any of these aimed at my head in a small room. eek.gif

Why would it matter if the speakers are all level matched to the same dB's at the main LP. Either way it'll be the same sound level at the seating positions from what ever speaker is aimed or not aimed at the seats.
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post #723 of 895 Old 02-10-2014, 09:12 PM
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Originally Posted by jbrown15 View Post

Why would it matter if the speakers are all level matched to the same dB's at the main LP. Either way it'll be the same sound level at the seating positions from what ever speaker is aimed or not aimed at the seats.

You mentioned you were worried about someone on the left missing out if the speaker wasn't angled an extra 2 degrees. I'm just not sure how bad it would actually be with a 2 degree difference. Won't every seat have a different angle anyway? I thought we were shooting for an average.


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Twelve 10" NHT subwoofer build.
Cloning of a NHT VR-3.
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post #724 of 895 Old 02-10-2014, 09:17 PM
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Quote:
Originally Posted by Erich H View Post

You mentioned you were worried about someone on the left missing out if the speaker wasn't angled an extra 2 degrees. I'm just not sure how bad it would actually be with a 2 degree difference. Won't every seat have a different angle anyway? I thought we were shooting for an average.

I get what you're saying, with the width of my room and having to rooms of three I was just hoping to have both side surrounds firing towards the middle seat.

But like I've said all along, it's your ship you steer it in which ever direction you want to go. I would just like to see a 20 degree version, but if there isn't one I understand.
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post #725 of 895 Old 02-10-2014, 09:22 PM
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I think you could just add a 1/2" strip of wood to the top of the rear panel and it would angle it an extra 2 degrees or so.


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post #726 of 895 Old 02-10-2014, 10:16 PM
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Man, I went from a speaker with a 90° horizontal coverage to one with 60° and here we are with +/-2° lol.
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post #727 of 895 Old 02-11-2014, 05:18 AM
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Originally Posted by Erich H View Post

I think you could just add a 1/2" strip of wood to the top of the rear panel and it would angle it an extra 2 degrees or so.

I agree.....probably the best compromise is make them with an 18 degree slant and people can easily customize them from there. I'll be ordering some as soon as they are available...I have 4 bare locations on my walls waiting for finished speakers biggrin.gif
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post #728 of 895 Old 02-13-2014, 05:01 PM
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I took a different approach to accommodate Erich’s precut baffles that would allow a 90º side/baffle joint and therefore making it easier to adjust enclosure volume by simply lengthening the sides. This is necessary because each enclosure will have different angles so that it can be aimed at the primary listening position.

I’m assuming that enclosure volume is the main consideration and not shape. Is that true?
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post #729 of 895 Old 02-14-2014, 06:06 AM
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Angled surround boxes should be done next week.


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post #730 of 895 Old 02-14-2014, 09:44 AM
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Quote:
Originally Posted by Erich H View Post

Angled surround boxes should be done next week.


Excellent!!!! I just received my 4 volt 10s that I had ordered.....as usual the packaging was impeccable; you are the man Erich! Looking forward to buying 4 of the enclosure flat packs
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post #731 of 895 Old 02-14-2014, 09:02 PM
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What is the internal volume of the slanted boxes? Do we know the frequency response for the V-8 and V-10 in each box?

3 - JTR 228's LCR (game room)
2 - DIY Sound Group V-8 Coaxials (game room)
4 - PSA Triax's (game room)
2 - SVS SB13+'s (living room)
1 - SVS SB12-NSD (bedroom)
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post #732 of 895 Old 02-14-2014, 09:24 PM
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Here you go, Ray. The ported simulations were optimized for a 2nd order high pass filter, 80Hz for the V10 and 100Hz for the V8. The numbers correspond to the enclosure volume, thus the Beta8CX0_4 would be a 0.4 ft^3 enclosure volume. All curves shown are without filters:







Edit 2-19-14 Clarified that the numbers reflect simulations, not the actual design offered by Erich
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post #733 of 895 Old 02-18-2014, 09:43 AM
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The surround boxes are getting cut this week from 3/4" mdf. They will be 18 degrees. Here are the dimensions (front baffle adds another .75" to the depth):

10" sealed:



8" ported:




I wasn't sure if the ported 8" should have the ports on top and bottom, or on the sides. I figured the sides might make more sense.


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post #734 of 895 Old 02-18-2014, 09:46 AM
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Very nice Erich! what were the 8" drivers that you were going to offer with the boxes?
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post #735 of 895 Old 02-18-2014, 09:53 AM
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Right now they are for MTG90's Eminence 8" and 10" designs.


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post #736 of 895 Old 02-18-2014, 11:06 AM
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Nice
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post #737 of 895 Old 02-18-2014, 11:33 AM
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I sure hope they come in different colors other than multiple shades of purple/orange and green! tongue.gif


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post #738 of 895 Old 02-18-2014, 05:57 PM
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What should we expect the -3 point to be of the 8 in the slanted box?

I moved my V-8's to surround duty now that my 228's arrived. Audyssey set them to 60hz for the cutoff.

With limited testing, they do an admirable job as surrounds to my 228's. Will be ordering more for rear surrounds.

3 - JTR 228's LCR (game room)
2 - DIY Sound Group V-8 Coaxials (game room)
4 - PSA Triax's (game room)
2 - SVS SB13+'s (living room)
1 - SVS SB12-NSD (bedroom)
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post #739 of 895 Old 02-19-2014, 04:52 AM
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How much will the slanted V8 flat pack cost? What about the V10 slanted flat pack? When will the slanted flat packs be available to purchase?
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post #740 of 895 Old 02-19-2014, 05:25 AM
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The V8 and V10 share the same box, so the price will be the same. They are being cut now, so I won't know the price until they are done.


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post #741 of 895 Old 02-19-2014, 08:04 AM
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will these slanted flat packs work on the upcoming high end coaxial? thanks
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post #742 of 895 Old 02-19-2014, 11:57 AM
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Quote:
Originally Posted by raynist View Post

What should we expect the -3 point to be of the 8 in the slanted box?

The answer is a few posts above....here. Box volume is ~0.68 ft^3 with driver installed.

~150Hz sealed
~80Hz ported
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post #743 of 895 Old 02-25-2014, 09:10 AM
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Any news on the slanted boxes? I'm dying to get cracking on putting my volt 10s together.....Erich, I promise I'll review them on the site as well as create a build thread. I'll gladly be the guinea pig....don't worry about putting them on the site, just send me a pm with instructions on how to throw money at you biggrin.gif
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post #744 of 895 Old 02-25-2014, 09:29 AM
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They're done, they just need to be wrapped up.


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post #745 of 895 Old 02-25-2014, 10:01 AM
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Sweet....thanks for getting those done! Like I said, I'll buy 4 as soon as they are ready to go
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post #746 of 895 Old 02-25-2014, 07:02 PM
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Quote:
Originally Posted by mhutchins View Post

Here you go, Ray. The ported simulations were optimized for a 2nd order high pass filter, 80Hz for the V10 and 100Hz for the V8. The numbers correspond to the enclosure volume, thus the Beta8CX0_4 would be a 0.4 ft^3 enclosure volume. All curves shown are without filters:







Edit 2-19-14 Clarified that the numbers reflect simulations, not the actual design offered by Erich

In these graphs the 8 is in a vented but you also have the 10 vented also? I think Erichs box volume is .67 so .7 is close enough?  It looks like the flat packs are set up as 8 vented 10 sealed? Can a guy get sealed flat pack and just add ports and it will work, seam like performance gain is great for both drivers just switching same size box from sealed to vented.

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post #747 of 895 Old 02-25-2014, 07:20 PM
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I dont recall seeing which cd was used for the 8 and 10" coaxial. So which one did you end up going with Erich or others?


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post #748 of 895 Old 02-25-2014, 07:26 PM
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Originally Posted by chrapladm View Post

I dont recall seeing which cd was used for the 8 and 10" coaxial. So which one did you end up going with Erich or others?

The v8 and v10 use the DNA-150 compression driver if those are the coaxials you are referring to....not sure which one is being used for the unnamed coaxials
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post #749 of 895 Old 02-25-2014, 07:41 PM
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Hey Brent,

The model I used was for a 1 ft^3 box volume. Versus sealed, the 10" ported design with a box volume of 0.67 ft^3 will yield an extra ~4 dB at 100 Hz and ~2 dB at 150 Hz with a 3" diameter port of length ~5-1/2". Whether or not that is worthwhile in your system is your call, of course. In the V8, the gain is much greater and well worth the added complexity.

The plots all grouped together are all sealed with different box volumes, then there is one ported model on each graph. You could easily add a port or two to the sealed design for the V10. I haven't measured in a CAD program what the clearances would be, but I would guess two 2" ports, 5-1/2" long could be placed on the side, maybe even in the front upper corners.

A delta of 0.03 ft^3 will have no measurable effect in these designs, so close enough. wink.gif

Mike
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post #750 of 895 Old 02-25-2014, 07:53 PM
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Quote:
Originally Posted by joebuddyguy View Post

The v8 and v10 use the DNA-150 compression driver if those are the coaxials you are referring to....not sure which one is being used for the unnamed coaxials

Thanks

I looked at possibly getting some CDs and ordering the Eminence woofer from Thomann to save on shipping. BUT having seen that they use the same CD that I am already waiting for with my other builds I might have to wait a few months before I can do anything. I need quite a few CD's and dont want to take any away from others who would be buying the coaxial as a kit. I will just have to wait until the 150's become available on their own. Needing seven of them in the end will have to wait.


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