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Budget Eminence Coaxial surround build!!! - Page 11

post #301 of 867
Thread Starter 
And I will agree with that statement. It has made a great difference with the selenium CD. The asd1001 would be a good stand in for the apt-50 and I would venture a guess it measures better with that crossover I posted above.
post #302 of 867
Quote:
Originally Posted by beastaudio View Post

That is the objective, to match the size, or around the size of the slant 8's but with a little different box.
It won't be good to 40hz, if you want good spl out of it. The aim is 80hz f3.
Perhaps you should read through the first 4 pages of the thread, as that is exactly what the eminence coax is: A cheap 10" coaxial speaker with a stock crossover you can buy straight from PE. I basically built all 4 for less than $800 including wood. PE even has a newer crossover that works with a different compression driver. Just do these three components and start building:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-525

http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-636

http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-502

So this CD, plus coax driver and stock crossover can all be used in a design that will be good for surround usage on a budget? Where can I find the cabinet plans?

Also, can someone link me to the thread where Zilch built his coaxial surrounds?
post #303 of 867
Thread Starter 
The Eminence with the selenium CD is Zilch's build, so look no further, you were also just linked to the schematic of that crossover. The three parts I listed do NOT have a custom XO for them built by a member around here that I know of, but that PXB2 crossover from Eminence seems to be a good one for that particular combo.

Also, Marty are you literally building EVERY speaker in the DIY area?
post #304 of 867
Quote:
Originally Posted by beastaudio View Post

The Eminence with the selenium CD is Zilch's build, so look no further, you were also just linked to the schematic of that crossover. The three parts I listed do NOT have a custom XO for them built by a member around here that I know of, but that PXB2 crossover from Eminence seems to be a good one for that particular combo.

Also, Marty are you literally building EVERY speaker in the DIY area?

Get it marty!..lol
post #305 of 867
Quote:
Originally Posted by beastaudio View Post

The Eminence with the selenium CD is Zilch's build, so look no further, you were also just linked to the schematic of that crossover. The three parts I listed do NOT have a custom XO for them built by a member around here that I know of, but that PXB2 crossover from Eminence seems to be a good one for that particular combo.

Also, Marty are you literally building EVERY speaker in the DIY area?

LoL! I have random speaker parts laying everywhere in my storage room, right now I am in the process on building a Radian-951PB build with a soon to be ordered Seos-18, and a bunch of other semi finished projects. I have BMS-4550's, 220ti's, a single 2226 and several other various CD's and mid-range drivers, such as a pair of Seas '18W's and a pair of Scan Speak mids as well.
post #306 of 867
I received the sample of the neo magnet compression driver today with the on assembly. The threads aren't exactly the same as they are on the Eminence coaxial woofer, so I'll have to look into that. But the CD itself looks very nice. Not sure how it will test though.
post #307 of 867
I went ahead a ripped off your design with some slight changes. Basically built the same angled boxes as these will be my rear surrounds and I'm hoping they blend ok with my JTR slant 8 sides and single 8 wides. I used the same eminence 10" coax but went with the d220ti cd with the stock eminence 1600hz xo and an lpad. I basically have to back the l-pad almost all the way out to balance the sound (just by ear so far). I will take some measurements when I have a chance to see if they measure as good as they sound. I've been running one beside an alpha-8 minion and they sound very similar on axis.
post #308 of 867
Has anyone found a source for the B&C XO-1 crossover in the US? Its still listed on the B&C website but seems hard to find outside of a couple of British websites.
post #309 of 867
Thread Starter 
Quote:
Originally Posted by subyguy View Post

I went ahead a ripped off your design with some slight changes. Basically built the same angled boxes as these will be my rear surrounds and I'm hoping they blend ok with my JTR slant 8 sides and single 8 wides. I used the same eminence 10" coax but went with the d220ti cd with the stock eminence 1600hz xo and an lpad. I basically have to back the l-pad almost all the way out to balance the sound (just by ear so far). I will take some measurements when I have a chance to see if they measure as good as they sound. I've been running one beside an alpha-8 minion and they sound very similar on axis.

Looking forward to it!

Quote:
Originally Posted by NWCgrad View Post

Has anyone found a source for the B&C XO-1 crossover in the US? Its still listed on the B&C website but seems hard to find outside of a couple of British websites.

Have you called these guys to ask? http://www.prosoundservice.com/m9/BC-8CXT--b-c-8cxt-8-coaxial-400-w.html
post #310 of 867
▲▲▲Thanks for the recommendatio. I have tried the search function on that website with no luck. I just sent them an email asking if it's available. On the B&C website, under the suggested designs tab, they show schematics for a crossover for the 12HCX76 coaxial model (however that model sells for more $500 at Parts Express).
Edited by NWCgrad - 10/8/13 at 10:37am
post #311 of 867
Thread Starter 
yea, but it is sweet man biggrin.gif Just sayin'
post #312 of 867
What's the status on the Beyma 8CX300ND? Gotten one yet Beast?
post #313 of 867
Thread Starter 
No guys, unfortunately the discretionary funds for the month got absorbed by an amp deal I couldn't pass up. Next on the list is the Beyma's though, so don't worry. They should be coming soon. I am also interested to see what Erich finds with the neo drivers he just got in!
post #314 of 867
Heres the result of my build. Basically the same box beast built with the bet 10=CX, D220TI CD and the stock eminence 1600Hz XO. I measured with my omnimic with the speaker sitting at the edge of my sub 30" of the floor with the angled baffle facing up. Definitely an ugly curve but for a rear surround I'm OK with it. It actually sounds very good and part of the issue could be my measurement setup. I used an adjustable l-pad to tame the CD down and pretty much have to turn it all the way down to not have it way too bright.

post #315 of 867
Thread Starter 
Try just having the baffle facing out into the room like normal and angled down (if you have carpeted floors) and set the mic about a foot off the cone centered. I bet the the 5k dip is ceiling reflection. Still not too bad and you have that constrained down further than the 5dB y-axis norm. Looks solid, but I didn't have that big null in my measurements...
post #316 of 867
The roof would have to be really close to make a 5k null...
Also, the peak at 2k is probably what makes most of the light sounding...nes
post #317 of 867
The roof was about 5 1/2 feet above the speaker. Also keep in mind that this is a stock out of the box omnimic which I don't really trust over 1kHz or so. Everything I've ever measured has been a mess up high with this mic. I might take some measurements of one of my single 8's in a similar setup and see how they look. I've already put away all the temporary wire I strung to do this sweep. I was feeding it a full bridged xls 1500 for that sweep since it was easiest to re-wire. I was hoping for slightly more bottom end but the box is certainly on the small side for this setup. With a ported box they would likely dig pretty deep.
post #318 of 867
Thread Starter 
That would be interesting to see what the s8 did in the same orientation. Oh and eXa? Your avatar gets me everytime. Gotta be the creepiest one I have come across.
post #319 of 867

This thread inspired me to start making sawdust. Right now, glue is drying on 1 cubic foot boxes. Still not sure what I'm going to do for port length. Does a calculated length of .5in mean to just cut a hole in the box?

post #320 of 867
Quote:
Originally Posted by subyguy View Post

Heres the result of my build. Basically the same box beast built with the bet 10=CX, D220TI CD and the stock eminence 1600Hz XO. I measured with my omnimic with the speaker sitting at the edge of my sub 30" of the floor with the angled baffle facing up. Definitely an ugly curve but for a rear surround I'm OK with it. It actually sounds very good and part of the issue could be my measurement setup. I used an adjustable l-pad to tame the CD down and pretty much have to turn it all the way down to not have it way too bright.


You should measure the drivers seperately also and overlay.

Then compare with the summed response to see if you can pinpoint the issue....

Just looking it seems the woofer is not crossed high enough order and some of its "junk" is still showing,

The CD is turned waay down which is likely the cause for the gap once the woofer tanks.

EDIT: You also might try swapping polarity on the tweeter to see if it helps the gap.
post #321 of 867
Thread Starter 
With a 1600hz XO I still don't know how much "junk" would still be going on that much further off, but agree with your statement that it could be a reversed polarity or perhaps even the l-pad is attenuating just that single section of the high end. Who knows. Suby, you you be willing to repost that sweep with 5dB increments on the y-axis as well. Not just to make the graph look better, but that is basically the standard for posting graphs and if I were to compare them to mine, it will make for a much easier apples to apples graph.
post #322 of 867
Adjusting the load level doesn't change the shape of the curve at all, it just pivots at 1600Hz but the gap remains. I may try swapping the CD polarity today. The issue is as much the peak at 2K as it is the dip above.

Here's the 5db incremented graph.

Edited by subyguy - 10/14/13 at 9:11am
post #323 of 867
And this is the same graph with the cd polarity reversed. Red is reverse and black is the old line. I think i'm going to stack with what I had. These are going to be 8th and 9th channel in my room as rear surrounds so they are good enough.
post #324 of 867
Quote:
Originally Posted by beastaudio View Post

Looking forward to it!
Have you called these guys to ask? http://www.prosoundservice.com/m9/BC-8CXT--b-c-8cxt-8-coaxial-400-w.html

They never responded to my email, but I found the item on their web site for $40.00. Not bad, can build a pair for around $500.
post #325 of 867
Thread Starter 
Quote:
Originally Posted by subyguy View Post

And this is the same graph with the cd polarity reversed. Red is reverse and black is the old line. I think i'm going to stack with what I had. These are going to be 8th and 9th channel in my room as rear surrounds so they are good enough.

Still a pretty solid response for a stock XO and the overall $$ into it. Let us know how you like them! I have loved mine certainly! Which L-pad did you go with so I may add it to the parts list?

Quote:
Originally Posted by NWCgrad View Post

They never responded to my email, but I found the item on their web site for $40.00. Not bad, can build a pair for around $500.

So are you going with it?
post #326 of 867
↑↑↑Not yet, still waiting on my electronics to arrive back in the United States from overseas. Packed out in June, must be a really slow ship. Assuming everything arrives intact, subwoofer project is up first. Just performing a pre assessment.
post #327 of 867
Quote:
Originally Posted by beastaudio View Post

Still a pretty solid response for a stock XO and the overall $$ into it. Let us know how you like them! I have loved mine certainly! Which L-pad did you go with so I may add it to the parts list?
So are you going with it?

I went with:
260-255 L-Pad 50W Mono 1" Shaft 8 Ohm from PE.
post #328 of 867
Beast what makes the Beyma better than the rest?
Does USS have them in stock?

I love the idea of a coax for surround.and would order a pair now(and send a x-over builder one) if we could convince someone to put together a x-over. Well and if they're in-stock and Beast can sell me on why I need these over the B&C 8CXanyofthem
post #329 of 867
USS sell the Beyma with a passive x-over.......its what I am planning for rears, about $450 each including the crossover

http://www.usspeaker.com/beyma%208cx300nd-1.htm
post #330 of 867
Thread Starter 
Quote:
Originally Posted by JohnDean View Post

Beast what makes the Beyma better than the rest?
Does USS have them in stock?

I love the idea of a coax for surround.and would order a pair now(and send a x-over builder one) if we could convince someone to put together a x-over. Well and if they're in-stock and Beast can sell me on why I need these over the B&C 8CXanyofthem

Quote:
Originally Posted by Elill View Post

USS sell the Beyma with a passive x-over.......its what I am planning for rears, about $450 each including the crossover

http://www.usspeaker.com/beyma%208cx300nd-1.htm

I have already spoken with Al and the Beyma's just got in stock again. If you guys are wanting to put an order together, please PM me and I will add you to the list. I am attempting to get a discount on them if I can cram enough orders together.
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