Good point.
Many good mids, you say: suggest one?
I considered PRV Audio 5MR450-NDY used on the @xrk971 OB design; wonder about its ragged spec sheet response & the 93-94 dB/W near the intended crossover point. It's kind of pricey -- USD99 at PE, and found nowhere on this side of the border.
Regarding Dayton's, Solen does offer lots of them. Not quite the values PE often offers, but still decent. For now, their prices haven't changed, so now might be an opportune window before trade wars. Haven't examined Dayton mids before.
Those measurements were made to support an active speaker with DSP crossovers. I was not concerned about absolute sensitivity, only the relative sensitivity between the three drivers. So truthfully, I don't know.
NE-149W-04 with 88 dB migth mary well with the low efficienty of the SB34RNX75-6 or the SLS12-08. But I am not sure of what is the SB34RNX sensivity in real life in 70L, hence I asked to Jim above that has such bass cabinet with it. Could more or less work if you accept a 250/300 hz acoustical cut off between the two drivers. The final efficienty should be nearer to 84 dB at the end.
If the BETA-8A in 8" can be ruled in it baffle step with a 12dB or 18 dB low pass, maybe a choice at 94 dB in the midrange.
SB Audience has a good midwoof 6" with some sensivity (not the midrange one but the MW in the ref). Troels Gravsen and Tony Gee used the same Faital mid with good efficienty as well.
A lot of choice, one can ask some experienced diyers here that tried a lot of drivers like Profiguy member, perhaps ?
If the BETA-8A in 8" can be ruled in it baffle step with a 12dB or 18 dB low pass, maybe a choice at 94 dB in the midrange.
SB Audience has a good midwoof 6" with some sensivity (not the midrange one but the MW in the ref). Troels Gravsen and Tony Gee used the same Faital mid with good efficienty as well.
A lot of choice, one can ask some experienced diyers here that tried a lot of drivers like Profiguy member, perhaps ?
Last edited:
From the SB34NRX75-6 spec sheet. This is 2.83V at 31.6 cm (that is a rather odd distance). A rough calculation to convert it to 1 m results in about 90 dB sensitivity at 100 Hz. That seems reasonable based on my measurements.
I agree with this statement in GENERAL. I think in this particular case, looking for a 12" driver, it is less applicable. Dayton has some low-budget 12" drivers (DC300?) that we wouldn't end up choosing and some good subs like the RSS315 which are out of budget for this project in the US. The Designer series are the ones I would have considered for this project but are pretty expensive in Europe. If there was a Reference Series 12", then that would be hard to pass up.
SB Acoustics and Peerless offer more for the money in the $30-$70 tweeter category, but Dayton dominates the under $30 tweeter market.
I think it is normalized number to 1 meter (but distance measurement is less as you said). Hey this little rise rigth where it matters (150 hz) is nice, wonder if still there after boxing ?!
Don't forget guys the Dayton metal cone 12" is a good one but has very low efficienty. If it is okay according to the midwoofer (it extends choice with lower efficienty drivers like the good 15NBAC, then it is a valid choice for those having >= 100W amps ?
The SB26ADC seems ideal as tweeter for Q/P efficienty for such a project. and can be waveguided by @augerpro at somasonus website third party WG you have to print 3D (please make a donation if). I had choose the 22 TAF/G but didn't hear the sb26ADC yet (had good feeling with the STAC wich is fabric), many choices...
Don't forget guys the Dayton metal cone 12" is a good one but has very low efficienty. If it is okay according to the midwoofer (it extends choice with lower efficienty drivers like the good 15NBAC, then it is a valid choice for those having >= 100W amps ?
The SB26ADC seems ideal as tweeter for Q/P efficienty for such a project. and can be waveguided by @augerpro at somasonus website third party WG you have to print 3D (please make a donation if). I had choose the 22 TAF/G but didn't hear the sb26ADC yet (had good feeling with the STAC wich is fabric), many choices...
Last edited:
On their website they have made it more clear about the measurement conditions. SPL presented was already converted to 1m.
Old datasheet has it different.
Last edited:
Which one? The RSS315HF?
If so, it's significantly over the budget for a "Budget" build.
Hificompass does his distortion measurements at 31.5 cm so that the conversion to dB @ 1m is a simple -10dB adjustment.
Again, are you sure the measurement given is not normalized to 1m/2.83V after measurement?
Edit : okay, indeed to much expensive is the 12" RSS315.
Edit : okay, indeed to much expensive is the 12" RSS315.
Last edited:
Actually, where are you getting this info? Looking at the spec sheet, I see more like 87-88 dB at that range. Ah -- that's the 4R version. Yup 8R is as you say.
I came across this LEAP analyzed/projected passive 3-way kit on Madisound's SB34NRX75-6 page -- https://www.madisound.com/library/stacks/SB34_SB15_810921.pdf. It combines the SB15NAC-8 with the SB34NRX75-6, crossing at ~230Hz. Big 3.8cf sealed, overall FR shows about 4 dB rise starting 500hz, peaking at 50~55hz. Probably a rich fat bass if pushed against the wall but more neutral further away.
So the SB15NAC-8 may be a workable choice after all.
Many seems to forget that this topic is about a cheap version of the classic monkey coffin, not an advanced high end speaker. Waveguides and woofers that cost a lot are not an option i thought (therefor the other tread/project is there). And Dayton is not cheap outside the US, so for many not really an option for this. Peerless can be (availebility is maybe an issue), SB is on some cases, but if a woofer cost +200€/$ it's out of the budget i think.
FaitalPRO 5FE120 has a pretty looking 90dB FR, almost as if it were drawn on purpose, demodulation rings, $50 at PE.
With the SB34NRX on a wide baffle and 5-6dB baffle step loss, and the SB15NBAC 8-ohm versions in a 3-way with 1-2dB midrange boost, I'd take the bet that it does work .
However, I agree with Waxx's last post and in the end, at least due the theme of this thread, the SB34NRX is going to get eliminated.
So, something that has not really been discussed yet... for a budget build, easy-to-construct is a desirable feature. Is having a non-circular driver like the FaitalPro above an issue?
seems pretty good design that this Madisound project, the SB34RNX can be surely swapped by the SLS-12...
SB34NRX75-6 / 70L closed, Qtc 0.69 (Blue line is Jim NF measurement)
Faital Pro 12RS430 / BR 70L @ 33hz
Faital Pro 12FE330 / BR 120L @ 35Hz
LaVoce SSF122.50L-8 BR 65L @ 40 hz
Dayton DC300 / BR 80L @ 30Hz
Peerless SLS-P830669 / 90L closed, Qtc 0.72
Beyma 12BR70 / BR 100L @ 30Hz
Faital Pro 12RS430 / BR 70L @ 33hz
Faital Pro 12FE330 / BR 120L @ 35Hz
LaVoce SSF122.50L-8 BR 65L @ 40 hz
Dayton DC300 / BR 80L @ 30Hz
Peerless SLS-P830669 / 90L closed, Qtc 0.72
Beyma 12BR70 / BR 100L @ 30Hz
Attachments
look at the 15NAC-04, on the graph 2 pi measurement there is almost a 2dB deep between 550 hz and 1250 Hz, I don't know how you can adress this in a box if want to avoid a deep, so here it seems more close to 85/86 dB. But you are rigth on the Madisound they use the paper the NRX 8dB that seems having less sensivity. So it should work indeed.
Here the SLS with a 12 dB low pass filter in spite of a 6 dB, Qtc 0.78; minor leaks, heavy stuffed/sealed : 67 liters. the 100 dB in reality should be around 88 dB.
Last edited:
Just use the 5FE125 (with demodulation ring) or 5FE105 (w/o).
Same driver but with round basket.
@waxx Not sure why you say an Augerpro WG costs a lot. Maybe I'm out of touch 3D printing cost?
WRT the SB34... I request that it remain an alternate, and a crossover developed for it along with whatever the majority (or primary driver of this project) deems to be the ideal woofer.
If there's interest, I think I could negotiate a good discounted group buy with Solen for Canadians.
WRT the SB34... I request that it remain an alternate, and a crossover developed for it along with whatever the majority (or primary driver of this project) deems to be the ideal woofer.
If there's interest, I think I could negotiate a good discounted group buy with Solen for Canadians.