The SB34SW is clearly a sub, not sure it is clean enough and ligth enough to play clean above... 150 Hz ? 100 Hz ?
The SB34RNX-L cataloged as a woofer can cross that gap, maybe no more than 300 Hz acoustical according some reviex and measurements : @profiguy and @IamJF . Then comes the SB34RNXL that can climb well up to 500 hz with very low THD at the price of not being really a subwoofer but if vented perhaps in a bigger load, was made for that at seing the TS. It is upon a a cheap price, was not talked here because of that (more expensive + needs a boost in the lows). Sealed, The RNX-L is between a sub and a midrange >50 Hz F3 up to <500 hz.
The 12PR320 of the OSMC is a pro midwoofer, made to climb higher cleanly, so shorter in the lows than all the above, but so has a very good efficienty. (was needed to cope to the Volt mi dome and stay atractive for tubes amps... trade off chosen by one guy as OP... not the same process here)
The SB34RNX-L cataloged as a woofer can cross that gap, maybe no more than 300 Hz acoustical according some reviex and measurements : @profiguy and @IamJF . Then comes the SB34RNXL that can climb well up to 500 hz with very low THD at the price of not being really a subwoofer but if vented perhaps in a bigger load, was made for that at seing the TS. It is upon a a cheap price, was not talked here because of that (more expensive + needs a boost in the lows). Sealed, The RNX-L is between a sub and a midrange >50 Hz F3 up to <500 hz.
The 12PR320 of the OSMC is a pro midwoofer, made to climb higher cleanly, so shorter in the lows than all the above, but so has a very good efficienty. (was needed to cope to the Volt mi dome and stay atractive for tubes amps... trade off chosen by one guy as OP... not the same process here)
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I think the 830668 is a good low cost choice, but since the Tarkus design exists, what should we do better than that design to make it appealing? Single box with a different look. Lower distortion mid, and tweeter?
sealed... more versatile, cleaner bass (group delay) ? 3 ways classic look (easier for the peeps) ? For the mid and treble, yes. Something maybe more neutral and better resolution. The Tarkus was intented to reproduce rock guitar and rounding the corner for the average reccording if i understood well.
For now the proposal of the mids seems good as well famous : 15NBAC, NE-149W-04 (but just North America), Faitals...(several choices), and many others...
For now the proposal of the mids seems good as well famous : 15NBAC, NE-149W-04 (but just North America), Faitals...(several choices), and many others...
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Ok, so smaller size of about 2 cu-ft. An f3 of 47hz. Lower maximum SPL that a ported speaker with the same woofer, but likely loud enough for many. Inexpensive. (How low in cost would you have in mind?)
A dome mid might be an option. Should be plenty of small cone mids that could work.
How about this one? https://www.parts-express.com/Peerless-830656-5-1-4-Paper-Cone-SDS-Woofer-264-1078?quantity=1 It's not going to play as loud as a 6.5", but neither is the completed speaker, so shouldn't matter. . Off axis should be better. XO should be straight forward.
What tweeter are you thinking about? Maybe that good one someone was talking about in the thread. I forget which one. Not the H26 I mentioned, although that could also work well depending on what you prefer off axis.
Possibly a nice mid choice. https://www.parts-express.com/pedocs/specs/264-1066--tymphany-hds-p830992-spec-sheet.pdf I have the 5.25" version of this in my favorite 2-way. I think the one I have could be called neutral. It doesn't seem to be available though.
I have this one, and measures good. Haven't used it yet. https://www.parts-express.com/pedocs/specs/264-1070--tymphany-hds-p830870-spec-sheet.pdf
A dome mid might be an option. Should be plenty of small cone mids that could work.
How about this one? https://www.parts-express.com/Peerless-830656-5-1-4-Paper-Cone-SDS-Woofer-264-1078?quantity=1 It's not going to play as loud as a 6.5", but neither is the completed speaker, so shouldn't matter. . Off axis should be better. XO should be straight forward.
What tweeter are you thinking about? Maybe that good one someone was talking about in the thread. I forget which one. Not the H26 I mentioned, although that could also work well depending on what you prefer off axis.
Possibly a nice mid choice. https://www.parts-express.com/pedocs/specs/264-1066--tymphany-hds-p830992-spec-sheet.pdf I have the 5.25" version of this in my favorite 2-way. I think the one I have could be called neutral. It doesn't seem to be available though.
I have this one, and measures good. Haven't used it yet. https://www.parts-express.com/pedocs/specs/264-1070--tymphany-hds-p830870-spec-sheet.pdf
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Maybe a poll is needed, I very don't know ?! I am totally neutral as I just give time in the braimstorming beginning phase to give thougths to the wheel. ( to focus towards the go-no go decision for others whom could be interrested to build one.)
Not sure yet.
I have a bunch of different small drivers on hand. NE123, Dayton Audio PC68-4 2-1/2" Full-Range Poly Cone, SEAS MU10RB-SL, ScanSpeak 10F
One possibility is Peerless 830657 6.5" SDS -- used in the Tarkus -- with SB26ADC, esp with WG to cross quite low, maybe 12~1500Hz. I have those too.
No polar measurements exist as far as I know but i suppose there might be directivity misnatch between the (big and beaming) 6.5" mid and the non-waveguide tweeter with a energy peak above x-over frequency.
So a (much?) smaller mid might be a good choice.
I also think the woofer tuning with its 80 Hz peak is probably fun but could be more neutral.
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Wouldn't both be the same at the top? Also, the narrow baffle has a greater range of directivity swing.
All the 3" of above will miss some efficienty but if you have them in 4 ohms. T Gravsen shown those 3" with 8" cones were crosssed too low and then the mid was chosen a little bigger for the evo of his "little" 3 ways classic. 4" to 6.5" is certainly a good target. Certainly few exceptions as the Beta-8A talked above in the hand of a good filter designer (who I am not) as a 8" and the mid domes that are out for that project due to the prices.
Surely the appeal of the Tarkus is its ability to deliver full-bodied rock sound from the mid-bass up to the limits of that 6.5" mid, with good transition between the 2. That's why I think the Peerless 830657 6.5" SDS used in the Tarkus with SB26ADC with WG crossed quite low, no higher than 1500Hz, could be a modern update -- something with more consistent directivity but similar rocking appeal.
Of course, I've never heard the Tarkus, and if it really has an 80Hz peak, I might just hate it. 🤣
But some of my old rocker friends nostalgic for their youth would probably love it. And maybe young rap/modern dance lovers. That's who I'd build this for. This type of speaker has no place in my home. 😉
Who will even look at the poll. No one but potential designers are even posting in these threads.
In the other thread there were many people who were interested in something more "BUDGET" friendly. That was not the point of that thread and was going to get hijacked by these discussions -- people couldn't (and still can't) even agree on what "budget" is. That is actually fine, because it is a subjective term.
The title of this thread is "Discussion" and we are discussing, so I think we are achieving or goals 😂 😂 😂
There are still some things I want to discuss regarding the woofer and then I will post a poll.
One of my biggest concerns right now - as mentioned several times - is that it is not clear who is going to build / design something. Most people want to use what they have on hand - which doesn't necessarily agree with what is being discussed. I am willing to build prototypes, measure and design some things. But they won't be something I keep and use so there are some limitations - the most significant is that I don't have the SB34NRX and not sure I'd be willing to buy 1 or 2 ("not sure" means I may change my mind on this). I also don't have any of the 10" drivers mentioned, and not interested in buying them. Pretty much everything else mentioned I have or would be willing to buy.
One 10" driver that has not come up, but I do have on hand, is the Scan-speak Discovery 26W/4534G. If that is appealing to people let me know. I haven't mentioned it because I don't consider it a "budget" driver.
I'll post more tonight to try to nail down some of the woofer decisions.
We're still just talking. That's an idea. Is it worth pursuing, whether as a group or not?
Maybe focussing on the midwoof now able to cope with both 10" and 12" ?
Say >= 200 Hz electrical up to a tweeter ? The bass drivers are more or less in the same efficienty ballpark at 1 to 2 dB.
If for instance the Bass is, say, 89db/2.83V at 100 hz boxed and the cut off is around 200 Hz electrical, what shhould be the efficienty target of the midwoof with as a goal to rule the baffle step (38 cm width circa front baffle) ?
We surely as it is a 10" or 12", reduce the choice to 4" to 5.5" for the driver ? A 300 hz acoustical cut off is a classic !
Say >= 200 Hz electrical up to a tweeter ? The bass drivers are more or less in the same efficienty ballpark at 1 to 2 dB.
If for instance the Bass is, say, 89db/2.83V at 100 hz boxed and the cut off is around 200 Hz electrical, what shhould be the efficienty target of the midwoof with as a goal to rule the baffle step (38 cm width circa front baffle) ?
We surely as it is a 10" or 12", reduce the choice to 4" to 5.5" for the driver ? A 300 hz acoustical cut off is a classic !
What woofer equals, or exceeds these numbers and costs under $200? I lost track.
Peerless 830845
55L.....f3<42.....f6<34
65L.....f3<40.....f6<32
75L.....f3<39.....f6<31
Peerless 830845
55L.....f3<42.....f6<34
65L.....f3<40.....f6<32
75L.....f3<39.....f6<31