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Mid to go with SB29NRX75-8 10" Woofer
I ended up buying a pair of the SB29NRX75-8 10" Woofer from Mad's black friday sale and now I need to find a mid to go with them.
I have a pair of the Morel Cam 558 dome mids on the shelf that I could use. I think these woofers might play high enough to match up with those.
I could buy a pair of the 4 or 5" SBNRX's and be all matchy matchy...
What about the Scan Discovery 4-5" drivers? Anybody have experience with those?
Would like to keep it under $200 for the pair, preferably well under.
Any other suggestions?
Comments
I appreciate matchy-matchy, but IMO, the 4-5" SBs are too... "wooferish". The SB29 will totally make it up high enough for the Morel. It'd be my choice.
A lot of people favor the MDM55 from 900+, or even 1k+. I'm not sure it will do that high very well.
I do know Chuck used it to the 5" SS Disco in his Victors build, so it is indeed capable.
I think the 4" CAC would be another valid choice if you keep it in the family.
If you are okay with diversification of brand, I'd look for a higher sensitivity 4" like the PRV 4MR60-4 or the Dayton PC105-4.
What tweeter you using?
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Definitely considering the Morels, especially since I already have them, as long as the woofer is comfortable playing that high.
Not very concerned about matching.
Not decided on tweeter, I have a pair of SB21SDC and Fountek NeoCD 1.0 on the shelf.
Fountek NeoCD 1.0
MDM55
SB29NRX75-8
Get to work.
How about some Vifa PL11WG09? I know a guy
I built a 3 way with an RS270 woofer, MDM55 dome mid and an Airborne 5002 amt tweeter.
Crossover measurements show about 900Hz for the Morel, so if a lowly RS270 can play that high, the SB should be good.
FWIW, one of the best designs I have done.
Strongly agree!
You probably saw it when shopping for the woofers, but the SB12CAC-4 are on sale for $45 each at Madisound.
I agree with the CAM-558 and NeoCD 1.0. My Indium 7's were the budget version of that concept. Beston RT-003C tweeter, HiVi DMN-A 2" dome mid, and Dayton SD270A-88 10" woofer. Crossover points for the Indium 7 were around 700 Hz between woofer and mid - and around 5 kHz between mid and tweeter. Something similar should work here.
Sehlin Sound Solutions
Scanspeak Discovery 10F/8424G 4" Midrange 8 ohm
https://www.madisoundspeakerstore.com/approx-4-midrange/scanspeak-discovery-10f/8424g-4-midrange-8-ohm/
I also agree with the MDM55 above 800.
The CAM-558 on a baffle wide enough to support the SB29 woofer will absolutely work great. Like already said, 900 Hz or so crossover point is a good choice for that dome mid. It can also cross pretty high so your choice of tweeters is really wide. I used that mid dome with the HiVi RT1C-A planars in my Agendas project and the NeoCD1.0 ribbons in my Gormachos.
https://www.madisoundspeakerstore.com/approx-5-woofers/zaph-audio-za14w08-5-aluminum-cone-mid/woofer/
Paul/Rick's Cantilenas used the MDM55/NeoCD1.0 combo with a 9" SS Rev, 22W/8857T. Xovers were 900 and 5k. I agree that the concept is valid, as long as the SB29 woofer reaches there. 8" woofer, 2" dome, and ribbon or planar works very well.
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I completely agree with this. Some of my favorite speakers have been 3 ways of this mix.
From a directivity and distortion point of view, that woofer is good to about 700Hz.
Things get funky at 800Hz:
Reference:
https://sbacoustics.com/product/10-sb29nrx75-8-norex/
In that graph, I would think to 800 will be fine with average rolloffs. However, being that is an IB or IEC measurement, I would wager the baffle peak may fill that dip in...
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Yes a typical 12” baffle will fill result in a peak in the on axis around 800-1KHz.
But won’t change the distortion; the impedance blip is the tell tale sign and the rising impedance to the right of the graph is also signal that it’s not a low inductance design.
I’d measure that driver before making decisions about midranges.
YMMV.
And thusly why I am still skeptical. An good 8" typically will be fine that high, but a 10?
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The measurements I took of my RS270P-4 bass bins showed they could easily and cleanly play to 1100-1200 Hz. Directivity is more of a concern than FR or distortion. I know I know.... two different drivers but my experience with SB drivers has been so positive I would be surprised if they didn't perform as well as a Dayton driver. JMHO of course.
Mitchell above offered up the ZA14, which is a pretty damn impressive midrange that can go lower than most domes. I might be biased though, given I have four sitting here awaiting use in a future project. On the downside, it does have a pretty steep: don't use this above 3k kind of thing going on.
Thanks for the responses everyone.
It looks like the dome mid is a definite maybe. I will measure the woofers when I get them and go from there. My original plan for these woofers was to pair them with a 4-5" cone mid, but I thought that this might be a possibility. If I can make this work, I will likely go this route.
For possible use with this project, or any future projects, I would like to continue exploring other options.
Recommendations so far:
SB12CAC-4 on sale for $44, considering these at that price, as I may want them for another project.
Scanspeak Discovery 10F/8424G these are a bit above my budget at $122 ea.
Apparantly Nick has a couple Vifa PL11WG09s he would like to part with. I found a data sheet for these, but don't know much else about them.
ZA14 - Couple of people recommended this one $60 ea.
PRV 4MR60-4 or the Dayton PC105-4 - for this project anyway, I would rather stay away from pincushion frames. I could rear mount them, so I guess they are still an option.
What about these?
SEAS Prestige MCA12RC, a little spendy at $92
madisoundspeakerstore.com/approx-4-midrange/seas-prestige-mca12rc-h1304-4.5-coated-paper-midrange/
SB Acoustics SB12MNRX2-25-04, midrange version of the SB12NRX for $60
madisoundspeakerstore.com/approx-4-midrange/sb-acoustics-sb12mnrx2-25-04-4-midrange.-4-ohm-new-version/
Any other suggestions?
Thanks again for everyone's help.
I have a pair of those SB12MNRX2-25-04 midranges. Build quality is superb. They will be the tenor of my next up 3 way project.
The sensitivity of the SB12MNRX2-25-04 beats the MCA12RC as well and very flat in FR from 200 ~ 3Khz XO points for less money . . . and a much nicer visual match to the chosen SB29NRX75-8 woofer
The 4" CAC hit down to 40-45 Hz F3 and are genuine woofers in their own right... can make fantastic 2 way TM or as in my case MTM (8 ohm) with pretty good bass response.
Interesting to note that almost all of the SB and Scanspeak paper cone 8-10" woofers (at least the ones on Mad's website) exhibit that same "funkiness" in the 700-1000 range
^^^
Agreed.
Surround related.
Most likely. The RS270P-4A has the same anomaly in its FR and impedance.
You see it higher in frequency on a lot of 6-7" woofers as well.