No doubt, but that's the SIG-180 which is a 6 1/2in. 😉
The ~860Hz increase in HD3 is in lock step with the main cone mode at about 2.6KHz, but assuming you're crossing LR4 or similar around 1.5KHz should already be somewhat attenuated, & if you're crossing around there your parallel LCR in series with the driver should help further squash it, so I wouldn't call it a deal-breaker at this price point. Not yet, anyway...
The ~860Hz increase in HD3 is in lock step with the main cone mode at about 2.6KHz, but assuming you're crossing LR4 or similar around 1.5KHz should already be somewhat attenuated, & if you're crossing around there your parallel LCR in series with the driver should help further squash it, so I wouldn't call it a deal-breaker at this price point. Not yet, anyway...
I'm full of my own plans, so I went straight for the Sig225 😆 Sorry 😊
There are plenty of 8 inch woofers that have zero issues up till about 1500Hz-2000Hz.
Good frequency response as well as low distortion.
Works great with a waveguide tweeter.
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It's a distortion response that was kinda expected.
Deal breaker? Maybe not, point is, there are so many other drivers or solutions that don't have this issue for about the same price.
H3 is just not great and also kinda hard to manage when it's around 800Hz and so wide band.
Btw, you can find the measurements here without scrolling through the entire topic;
https://www.htguide.com/forum/missi...n-wall-in-wall-mtm-for-ht?p=949587#post949587
Yup... but that's midrange territory, so beaming comes into to play too. And I haven't found any speaker with an 8" midranges, that cross much higher than around 1100Hz to keep the power response even and smooth. But agreed - on-axis they do climb up there...
Why would you want to cross higher if it's not needed? 🤔
D&D 8C crosses around 1200Hz, very smooth, even directivity and power response.
That is with a pretty standard Seas prestige line tweeter.
Any modern tweeter could do the same/better with an 8 inch waveguide.
Obviously a bigger woofer+waveguide will beam more, but I think that will be a good thing in most standard living rooms?
Plenty of other 8 inch woofer + waveguide or horn examples out there.
So I am missing your point a little, sorry?
Maybe. Possibly not though. Ignoring the resonance amplification, the baseline average HD3 per those measures is actually lurking in the -55dB / -60dB category assuming you can stamp on the ~3KHz mode sufficiently, which isn't fabulous but not catastrophic either, and while it's broader band than some, that can be a double-edged sword; I've tended to find a very high Q / narrow a mode can be tricky to home in on in practice, & has a greater chance of shifting about with drive level, potentially reducing the effectiveness of a stopband notch. So although I'm certainly not in line for 'cheerleader of the year' for these new units 😉 I'm keeping a cautiously open mind. Be interesting to see some more measurements over time.
I am curious about the 4,5 and 8 inch has well 🙂
Although we can kinda extrapolate a little as well at this point.
Which doesn't look amazing for the 5 inch either.
It makes you wonder if aluminium was such a great choice after all?
Peerless drivers with a very similar motor structure don't seem to have these issues I think?
(will dive back into the measurements for that)
6 inch woofers often seem troublesome.
It's just because you wrote 2000Hz for an 8".... and I've always found speakers with bigger midranges, crossing to high, less enjoyable and worse sounding - that's all 🙂
Looked at Discovery SS 8" too... but 20% more expensive and needed twice the volume. So the Sig225 looked good. I only need 60-70Hz to around 500Hz where my coax can comfortably take over. 20-30 liter volume each would be nice and 2 pieces per side.
Any other suggestions like the Dayton Sig/RS that you would look at/suggest?
My suggestion;
Use the 8 inch (or any other woofer) from about 80-120Hz and do the low-end with subwoofers.
Enjoy lower linear distortion as well as much lower IMD!! 🙂
Oh right, I meant distortion and freq resp, not the crossover point 🙂
80-120 Hz is hardly what I would call a "passband". It's a bit tight. Why not just 99-100Hz? 😛
IMO you should be able to use any 8" non-subwoofer driver up to 800Hz without concern.
IMO you should be able to use any 8" non-subwoofer driver up to 800Hz without concern.
If you can keep it within the piston range & are able to do something about the resonance distortion -sure, why not. I get the impression with these units that they've done what they can to produce some very affordable aluminium cone drivers with a basic FR sufficiently linear that they can be employed a bit like a soft-cone type and will give acceptable / reasonable (probably not optimum) results with fairly modest filtering, but should hopefully respond in slightly more 'advanced' (bad choice of word but the snooker's about to start again in a minute 😉 ) applications.
Agreed, there's a lot of dross about in this size bracket. Some good ones too though, to be fair.
I have 4 subwoofers in a multiple sub setup already - works great 👍 The reason why I like the woofers to be able to go to 60Hz, is because I found it easier to let them overlap with the subwoofers - per advice /inspiration from Earl Geddes. It avoids the dips often seen when paring mains with subwoofers.
2x Sig225 simulates 65Hz at -3dB in 40 liters closed - RS225 should do the same in 60 liters... but the Sig's looked nice - and almost like the woofers KEF use, which is neat when I use a KEF coax and like the design 🙂