CX-12 vs CX-10
I used the CX-12 and CX-10 with the ASD1001 on an Open Baffle just about 15 inches wide.
Without any eq and bass support , I preferred the 10 inch. I'd guess the 10 inch with bass support will sound quite good. The 12 inch with the asd1001 sounds a bit tame (!). Not bad by itself . I can't really say how they will end up when completed . I'm having trouble getting enough time doing a response test. So they are being used as is ! I'm learning to be patient ! 🙂
I used the CX-12 and CX-10 with the ASD1001 on an Open Baffle just about 15 inches wide.
Without any eq and bass support , I preferred the 10 inch. I'd guess the 10 inch with bass support will sound quite good. The 12 inch with the asd1001 sounds a bit tame (!). Not bad by itself . I can't really say how they will end up when completed . I'm having trouble getting enough time doing a response test. So they are being used as is ! I'm learning to be patient ! 🙂
Peavey RX-14 .
Has anyone heard the Peavey RX-14 compression driver ? It appears to have a very smooth impedance over the whole bandwidth. Easy for designing the crossover. Wonder how it sounds.
Has anyone heard the Peavey RX-14 compression driver ? It appears to have a very smooth impedance over the whole bandwidth. Easy for designing the crossover. Wonder how it sounds.
The initial sample is done, it sounds pretty good. I used the crossover from saurama's page but modified it for a slightly different response, as my box is a little wider so I had to marginally reduce the BSC and add some padding on the tweeter. Reason for added width was to get all the boards to fit on 1.5 sheets and have minimum number of seams showing. Paint over MDF tends to reveal seams quite early on, so this was sort of important.
The boxes are 3.5cft large standmounts and extend the bass response to a useful 50Hz. Not a huge amount but such big speakers tend to be pushed against a wall anyway, and that nicely bumps the response down to the early 40s. I'm still adjusting the padding and them it's on to an Econowave-inspired crossover, followed by some active attempts.
The good news is that it sounds much better than many $2k-ish multiway speakers. The bass has superb, clean punch and with a 20W Class A amplifier, it is loud enough to get the cops come looking. And I'm only testing one at a time, dunno what happens when they play in stereo! A 5W tube amp should get these to really loud levels without being strained.
What an awesome thread! I'm currently working on building some speakers with all Eminence Drivers.
The CX12 with ASD:1001, supported by Eminator 2515
The CX12 with ASD:1001, supported by Eminator 2515
Hi - can I ask you fellows - how feasible is it to replace the CX10 with a CX12 if one were using the 8ohm xo as described in NWCgrad's 10” coaxial collaborative design thread? That'd be with the PSD2013-8 tweeter.
(I realise the cabinet should ideally be made bigger, and I'm guessing the tweeter padded down less to match the higher sensitivity of the 12"?)
Cheers
B
(I realise the cabinet should ideally be made bigger, and I'm guessing the tweeter padded down less to match the higher sensitivity of the 12"?)
Cheers
B
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"The Eminence Beta CX-10 . What have you done with it lately ? "
Sealed up the rear hole and used it as a bass driver for a three way with a Dynaudio D76af and HDS 1" Peerless tweeter.. tried to use it with quite a few comp drivers but they all ended up having that crappy response around 3-7 k which is probably due to the throat geometry, it probably needs some sort of phase plug.. 3d printed fix perhaps??
Sealed up the rear hole and used it as a bass driver for a three way with a Dynaudio D76af and HDS 1" Peerless tweeter.. tried to use it with quite a few comp drivers but they all ended up having that crappy response around 3-7 k which is probably due to the throat geometry, it probably needs some sort of phase plug.. 3d printed fix perhaps??
about 1 cubic foot rear chamber - "hit" which can be felt with very little cone excursion
Those are cool. I thought about trying to build that, but I wasn't sure that my woodworking skills would be up to the task.
Here's what I'm working on. It's insanely huge! It didn't seem as big in paper. I just like hands on learning. Though it's not perfect, I am proud to say all the corners are square. The top sealed cab is 1.2 cubic feet, and will hold a CX-12. The bottom will have 2 15" and should reach 35Hz with mid to high 90's dB efficiency. I like it, but 330 liters, nearly 200 pounds OMG!
Anyway I have a question: Do you guys find it necessary to have a steep high pass filter at 100Hz to protect the cx-12 from over excursion as Eminence suggests?
Alex
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Hi, I can't say I'm farmiliar with NWCgrad's xo design. I did notice from this article: Using coaxial products for DIY monitors and home hi-fi applications | Eminence Speaker that the Eminence engineer folks use the same 2k5 xo with both the cx10 and cx12. I'm noob, and there could be other differences I'm not aware of, but it seems to me that the woofers can both play up to the same freq. to meet the tweeter. I'm still trying to figure out xo for my own, and considering miniDSP with it's incredible flexibility. Anyway so... Just wanted you to see that article if you hadn't seen it yet. Ciao
I've seen the driver used on an OB with a +10dB boost that specific region. I've also seen it with helper woofers and no highpass at all.
I'd be tempted to say no, but that depends on the power level you plan to be playing at. If it's less than about 40W, I'm guessing you should be fine without a highpass, but it might make integrating the woofer section a bit easier.
You should be able to get 110+dB with no highpass at all, which is a lot for a home speaker. 2nd order or higher at 100hz and you'll be approaching 120dB and the thermal limits of the driver (and lower excursion in general with lots of music). So... has real benefits, but you might want to skip it if the natural rolloff gives you good summing to a sub amp crossover (which it probably would, around 80-100Hz). Put some good fiberglass or denim insulation in that sealed chamber, both because it's a little small and because the 12" runs high in frequency. No eggcrate nonsense.
Good stuff, thanks. Yes I have some FG for it. Today I finished some more bracing, and now I'm ready to paint it with wood primer today.
I suspected the high pass would depend on how much power one feeds it. I guess I'll just have to play with it and see how it sums best to the woofers below. My buddie has a calibrated mic and REW. He may drop by this weekend. Fun times.
Cheers,
AlexQS
I suspected the high pass would depend on how much power one feeds it. I guess I'll just have to play with it and see how it sums best to the woofers below. My buddie has a calibrated mic and REW. He may drop by this weekend. Fun times.
Cheers,
AlexQS
This is a eminence cx-12, eminence asd:1001, and two eminence eminator 2515 15". The cx-12 has a high pass LR 24dB/oct at 160hz and a low pass LR 24dB/oct at 2500hz. The tweet is hp LR 24dB/oct at 2500hz inverted phase. The two 15" are in series and have a low pass BW 18dB/oct at 160hz. Initially I had the mid hp and bass lp at 120hz, but measuring the mid by itself didn't seem as flat as the bass driver in that region. It probably needs more work to flatten it out from 500hz down.
The cx12 is in a 1.2 cu ft sealed enclosure with a ton of fiberglass stuffed in. Mark Nofflers voice in Dire Straits sounds as clear as Diana Krawl. I'm amazed how one mono loudspeaker can sound so good. Since I am pleased with the results I'll build the other one next month.
Admittedly this graph cheats a little with 1/2 octave smoothing. It looks completely flat, but even with 1/6 octave smoothing the variations are less than 3dB. I'm a happy camper, it sounds really good to me.
Anyone know how to read a phase response graph? I need to learn how to do "time alignment" with miniDSP. It shows 0.0ms delay. Could this be correct, or am I doing something wrong? All measurements taken at 1 meter on axis, with loop back on the other channel for REW to use as a timing reference.
The cx12 is in a 1.2 cu ft sealed enclosure with a ton of fiberglass stuffed in. Mark Nofflers voice in Dire Straits sounds as clear as Diana Krawl. I'm amazed how one mono loudspeaker can sound so good. Since I am pleased with the results I'll build the other one next month.
Admittedly this graph cheats a little with 1/2 octave smoothing. It looks completely flat, but even with 1/6 octave smoothing the variations are less than 3dB. I'm a happy camper, it sounds really good to me.
Anyone know how to read a phase response graph? I need to learn how to do "time alignment" with miniDSP. It shows 0.0ms delay. Could this be correct, or am I doing something wrong? All measurements taken at 1 meter on axis, with loop back on the other channel for REW to use as a timing reference.
Attachments
I have Beta 12CX and BMS 4544 driver attached in 53l (~1.9ft3) closed box. I had them in 40x80cm open baffle which sounded quite good with a quick and dirty passive xo. Off course, they lacked low end due to narrow baffle.
Closed box offer a bit more low end for my purposes and with room gain it should be sufficient as they will be placed near concrete wall. The BMS driver requires a bit more work due to its' impedance curve, but preliminary tests show it will be worth it.
I will post pics and simulations when I get to that phase.
Closed box offer a bit more low end for my purposes and with room gain it should be sufficient as they will be placed near concrete wall. The BMS driver requires a bit more work due to its' impedance curve, but preliminary tests show it will be worth it.
I will post pics and simulations when I get to that phase.
I'm quite new to the DIY speaker world so excuse any dumb questions. I'm on a quest to get some wall mounted speakers (due to very young kids - if it's not bolted to something it gets pushed over) and the Beta's seem like they could work for me.
Local enough I see someone selling a 12cx plus ASD1001. Coupled with say a 1ft3 - 1.5ft3 sealed enclosure and the Eminence commercial XO (PXB2:2K5CX), would it be crazy to consider something like this as a left and right pair? Further down the line then get a matching center.
I understand the PXB2:2K5CX is probably not great due to the fact it's trying to cover all bases but it would be enough to get me going. A future upgrade could be to change the XO's or upgrade the CD's to a PSD:2013S-8.
Local enough I see someone selling a 12cx plus ASD1001. Coupled with say a 1ft3 - 1.5ft3 sealed enclosure and the Eminence commercial XO (PXB2:2K5CX), would it be crazy to consider something like this as a left and right pair? Further down the line then get a matching center.
I understand the PXB2:2K5CX is probably not great due to the fact it's trying to cover all bases but it would be enough to get me going. A future upgrade could be to change the XO's or upgrade the CD's to a PSD:2013S-8.
This is what came out of Beta 12CX and BMS 4544:
Last picture is not the simulation, but QC measurements imported to VituixCAD for presentation. As these were planned for near wall placement, without toe inn, refenrence angle is 20 degrees.
Last picture is not the simulation, but QC measurements imported to VituixCAD for presentation. As these were planned for near wall placement, without toe inn, refenrence angle is 20 degrees.
Nice build, if you don't look at it too closely 🙂 Baffle is brand new bamboo board, but rest are leftover chip board 🙂 It was clean, white and same height as the baffle. These were supposed to be prototype enclosures, but sounded so good that I don't want to tear them apart. Bigger ported enclosure would offer a more extension and body to low end, but now they can be placed near concrete wall without negative effects.
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