The challenge has really already been met with DXT-MON.
The tough part is really the port and cabinet geometry. Though if I wanted a kh120/150 I'd just buy them.
I have 3 passive radiators lying around bought 2 years ago .. those racetrack ones from SBAcoustics (158cm2) . All three have MUCH to stiff suspensions! (progressive spider)
11mm excursion/one way ??? (as stated here on this board several times)
NEVER !!!
The frustration factor in this hobby is sometimes pretty high if you expect QUALITY ....
Grmpfh!
11mm excursion/one way ??? (as stated here on this board several times)
NEVER !!!
The frustration factor in this hobby is sometimes pretty high if you expect QUALITY ....
Grmpfh!
DXT-MON : I don't like the side mounted PR ... and it is tuned to high! (afaik)
Old design .. no one here knows it , some DIY germans did that project in the past way before we got jabbed to death by Mr. Microsoft! (checkout online Dr. John Campbell from the UK )
Old design .. no one here knows it , some DIY germans did that project in the past way before we got jabbed to death by Mr. Microsoft! (checkout online Dr. John Campbell from the UK )
Not just as an hobbyist.
Btw, you just mentioned one of the biggest disadvantages (besides costs) of most passive radiators that almost no one talks about.
The compliance, Kms(x) ,is very often not very linear, very similar as just woofers.
So the Fs WILL shift as the cone excursion increases, resulting not only in distortion, but actually a very different tuning.
A bunch of nonsense there but best of luck to you.
I encountered the same problem with the oval PR's from KEF (foam cone block) , those BD139 ..
There are two versions , with different stiffness , both spiders are a bad joke!
I bought two of each at Ebay in excellent condition and had the luck the seller offered me to change for the softer ones without longing extra money!
Then I saw they were even false labelled!
Makes me want to throw rotten tomatoes at these guys from KEF !!!
Over the years I had quite some bad luck with these audio junk they are selling us! (sometimes)
Greetz , Johnny Rotten 🙂
There are two versions , with different stiffness , both spiders are a bad joke!
I bought two of each at Ebay in excellent condition and had the luck the seller offered me to change for the softer ones without longing extra money!
Then I saw they were even false labelled!
Makes me want to throw rotten tomatoes at these guys from KEF !!!
Over the years I had quite some bad luck with these audio junk they are selling us! (sometimes)
Greetz , Johnny Rotten 🙂
Sorry my time answering questions of very low relevance to the DIY hobby is too limited! My impression is there is also some kind of misunderstanding involved here ... if you can address your questions to someone else he might be happy to guide you to the promised land you are looking for 🙂
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A german tech side with lots of info (Steinwolle is rock wool here) :
https://www-jochenschulz-me.transla..._sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
More acoustic stuff of him :
https://www.jochenschulz.me/en/blog
https://www-jochenschulz-me.transla..._sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
More acoustic stuff of him :
https://www.jochenschulz.me/en/blog
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Sorry the first link needs no translation , here is the correct link :
https://www.jochenschulz.me/en/blog/rockwool-glasswool-hemp-best-absorber-material
A son of a glitch has bitten my reality here 🙂
https://www.jochenschulz.me/en/blog/rockwool-glasswool-hemp-best-absorber-material
A son of a glitch has bitten my reality here 🙂
Rockwool and health risks?
I mean, it's not the nicest stuff to work with, but as far as I know, there are no official health risks given out by governments, or any other official regulations?
I mean, it's not the nicest stuff to work with, but as far as I know, there are no official health risks given out by governments, or any other official regulations?
Just an idea , don't know if it is practical ... how about sucking the air OUT of the room instead of pressing it into the room and distributing the potentially dangerous fibers all over the listening room?
Of course you need a porous filter for this kind of problematic dust!
In a loudspeaker cabinet it should be no problem if you keep the inner end of the reflex tube at least 3 inches away from the rock wool/stone wool/glass wool etc (beyond the vortex zone where velocity of air is high) ... as long as you don't generate excessive sound levels in (!) your speaker so the fibers break into small pieces! (some research here is needed)
But you can use passive radiators for safety reasons ... PR's are on my Dayton Audio Wish List (DAWL) , same frame and inverted dome for cosmetics of course!
We should bomb Brian the Sales Rep. at Dayton OEM for that with email requests until he follows our demands 🙂
A loudspeaker is a friendly weapon with lots of bombing options 🙂
Of course you need a porous filter for this kind of problematic dust!
In a loudspeaker cabinet it should be no problem if you keep the inner end of the reflex tube at least 3 inches away from the rock wool/stone wool/glass wool etc (beyond the vortex zone where velocity of air is high) ... as long as you don't generate excessive sound levels in (!) your speaker so the fibers break into small pieces! (some research here is needed)
But you can use passive radiators for safety reasons ... PR's are on my Dayton Audio Wish List (DAWL) , same frame and inverted dome for cosmetics of course!
We should bomb Brian the Sales Rep. at Dayton OEM for that with email requests until he follows our demands 🙂
A loudspeaker is a friendly weapon with lots of bombing options 🙂
Here one of my fav CD's of all times , never tired to play the first 5 tracks (complete A-side of the LP) at least once a year :
Sound balance of the LP is better than CD release which appears to be a bit compressed (there seems to be an automatic standard algo working when they re-release their back catalogue) ... so if you know someone who can make you a digital copy it is worth the effort!
Sound balance of the LP is better than CD release which appears to be a bit compressed (there seems to be an automatic standard algo working when they re-release their back catalogue) ... so if you know someone who can make you a digital copy it is worth the effort!
@Marveloudio Can we get back on topic to the SIG series please?
Thanks.
It looks to be wobblier than Dayton’s published measurements.
But part of that is due to the measurement conditions- JonMarsh took a Quasi Near Field measurement- with the mic somewhere between 1/2” to the radius of the cone.
This is good for examining for any resonances intrinsic to the drive unit. IMO the main one is at 10Khz... very good for a stiff cone 6.5"
This driver, when mounted on a typical 8-9” wide baffle, and measured in the far field eg. 1m, will result in some boost centered around 1KHz and there will shelf under 500Hz due to baffle diffraction losses. This is the diffraction signature of a typical 15 3/4 x 8 3/4 baffle (400mm x 222mm):
So it may be flatter than what was shown in JonMarsh’s original measurement:
https://www.htguide.com/forum/missi...or-high-efficiency-on-wall-in-wall-mtm-for-ht
I shall wait for JonMarsh to take some full space 4pi measurements... and I suspect it will look closer to Dayton spec sheet...
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Not bad. HD2 reasonably-reasonable, & you can see the spike in HD3 associated with the ~10KHz breakup as expected centred on roughly 3.3KHz. About 55dB down -pretty good, & if you're crossing below that, as is going to be preferable to keep C2C down & the polars respectable, should be in the 'non-issue' category, & easy to address if you really want to go to town with a parallel high impedance LCR in series with the driver.
That RS210HF is still alarmingly good though, notwithstanding the miserable sensitivity. Still, power is cheap these days (although I'd rather have a bit more on the old efficiency front, but we'd be squaring the circle a mite, especially for these prices, so difficult to complain too much 😉 ).
That RS210HF is still alarmingly good though, notwithstanding the miserable sensitivity. Still, power is cheap these days (although I'd rather have a bit more on the old efficiency front, but we'd be squaring the circle a mite, especially for these prices, so difficult to complain too much 😉 ).