Very nice driver, but not exactly cheap (€468.88 each, if you buy 4, excl. shipping).
This one's 212,33 Euro. Admittedly, it's not as efficient.
Efficiency (2.83 V / 1 m.) - 98 dB
Resonant frequency - 30 Hz
Coil resistance - 5.0 Ohms
Qms - 4.40
Qes - 0.29
Qts - 0.27
Cms - 0.12mm/N
mms - 235 g
BL - 27.6 Tm
Vas - 269 L
L 1kHz - 2.56mH
L 10kHz - 1.05mH
SD - 0.1260 m 2
Eta - 2.43%
Coil diameter - 100 mm
Maximum linear working range of the coil - 22 mm (pp)
Maximum deflection without damage - 50 mm (pp).
Last edited:
Not so much dislike as I just don't see any advantages. With multiple subs, headroom is seldom an issue unless very low power subs are used, so excursion limiting isn't a big advantage. Closed boxes can operate below Fs, ported can't. and closed boxes are so easy to design and assemble. What's not to like?
Yea, that's pretty much nonsense. It's the pressure difference that applies a force to the cone. This force is greater for a closed box than a TL, but that is just the boxes compliance, which we know simply adds to that of the driver, meaning that it's effect is well known and easily accommodated or minimized with a larger enclosure. But the fact that the pressure is different on one side of the cone from the other is irrelevant.
That was the 4 Ohm version.
Don't let the price fool you. Every Tymphany driver I've used has far exceeded my expectations.
The Danes, including Carsten Tinggaard (or Purifi) have fully succeeded in bringing high and consistent quality to the market at low prices.
If tuned very low in a giant cab the sim naturally tends towards the impedance, excursion and GD of sealed. This is 2x (parallel) in 2000l @ 10 Hz.
Good looking kevlar loaded non-pressed paper cone.
Don't let the price fool you. Every Tymphany driver I've used has far exceeded my expectations.
The Danes, including Carsten Tinggaard (or Purifi) have fully succeeded in bringing high and consistent quality to the market at low prices.
If tuned very low in a giant cab the sim naturally tends towards the impedance, excursion and GD of sealed. This is 2x (parallel) in 2000l @ 10 Hz.
Good looking kevlar loaded non-pressed paper cone.
Last edited:
I love bang for the buck setups, even though I flirt with dropping bigger money on state of the art setups. The Peerless drivers that were in my vintage system were impressive, compared to other same era systems. If the enclosure size isn't a deal breaker, I could be pretty happy with a distributed setup with a couple of those for dirt cheap. The plywood would be drastically more expensive than the drivers!
Yep, the huge price increase was foreseeable 5 years ago and it was certainly worth stocking up at the time, provided you have storage space.
Even better would be a vented infinite baffle, where a retaining wall can be made of OSB and/or underlayment. 4 woofers with the horns protruding between them, possibly in 2.5 configuration.
Unfortunately, OSB and underlayment prices have nearly tripled from a few years ago.
Unfortunately, OSB and underlayment prices have nearly tripled from a few years ago.
Last edited:
Obviously someone has implemented this idea of infinite baffle (sub)woofers. In this case a sealed cabinet mounted in the drywall.
LP: 80 Hz.
LP: 80 Hz.
What did you aim for, concerning system F... and how much linear headroom did you aim for?
115db at 1meter isn't a small chore, 120db/1m is a feat. Multisub gets you there but lots of power isnt needed when enough subs are used, excursion is. With sealed subs 8, 18"s, just barely sneaks by with 14mm xmax ran down to 20hz.
I have 3 pro woofer 15s and 2 pro woofer 12s to handle <100 Hz. The room is not too big and highly sealed (except for ventilation system, which has acoustic filters on it) - double walls, floating ceiling, airtight doors, etc. Headroom in this situation is simply not an issue and calculation of displacement, etc. is a waste of time. I can easily do 120 dB down to about 20 Hz.
Work on this problem long enough and you learn what works and what doesn't and you come to understand intuitively what it takes. Your design sounds like its aimed at massive bass in free field conditions to me. In enclosed spaces - again depending on how leaky it is - much less is required. I feal the bass in my room just as readily as an IMAX, I just don't normally listen at those kinds of volume ... but I can, have and sometimes do.
The key is system design - including the room. Don't include the room and every situation is different - i.e. the room is the dominate variable <100 Hz. The rest are details.
I don't get it?? Are you accounting for mutual coupling?? A pair of properly set-up 15's and some EQ will get you 115Db @ 25Hz with relative ease. Going to 20Hz flat as what a technical exercise?? Any content down there where it would be needed??
Rob 🙂
I'll be honest here and admit that I never did do any calculations of this sort. After about 6 subwoofer replacements - because they were unsatisfactory - I end ed up with what I have now and I know that headroom has not been an issue since. All closed box, but who cares? Each one has individual DSP EQ to make it have any response shape required - in-situ of course. Summing them all up gets tricky, but THAT is worth the time to get right. Calculating the displacements when I just know that there is more than enough isn't.
When setting up multiple subs however, one must be cognisant of the amount of EQ being applied. I never went above +6 dB anywhere in the EQ matrix. I find a way to eliminate any very large peak requirements on any individual channel. That's how I minimize excursion.
When I first started making choices I knew that I should able to reach 115db/1m down to 30hz, under Xmax, per side. Now, as I put the finishing touches on things, and after seeing that I was already close, after the movie experience, I'm like ok, I have to use multi subs any way, lets see if I skinny into 120db down to 20hz. Just to be on par with the Imax theater.
After experimenting with with just one channel, I came to the conclusion that I don't want to hear past about half xmax, eyeing it. I believe I can hear the BL curve. So anyway, thats just one channel.
This is likely the territory that I didn't like (10mm and above) but it would only exist at the lowest note....Excursion is considerably lower at 30hz, 4.7mm. I don't know about sealed 15's hitting 115db/1m@25hz... you call 22mm "with ease"?...I call it, with distortion and far out enough to loose BL considerably.
@GM said that he found his point of diminishing returns about 117db/1m. I distinctly remember the 120db peaks from the Imax 2 weeks ago, and it is not like the 117db peaks from the Imax a week ago. Different movie but, whatever. Like you say, is this just for a technical exercise? Ya, and I think its cool. Its a challenge, involving my first love, Music. Increasing Woofer count, theoretically should continue to increase accuracy to the listening point. The whole independent bass sources spread out and summed together. My goal has been to try and raise Accuracy within the room as much as possible before sound treatment, Directivity and multi sub is all I got really after the obvious has been sorted, like drivers capable of putting out good FR with low excursion. Unlike some, I shouldn't have much of a mess to clean up, in the terms of successfully summing together several woofers below 100hz. I only say that because, at the very least, I know that when a person is just tuning to a small, single sweet spot, theres not much to "tweak" outside of playing with FR and time alignment, which I think software can take care of. I am not a sold fan on tuning Bass drivers separately but rather like to make eq corrections symmetrically if possible. I've also had stereo bass sources tuned individually and found it acceptable. I also think tuning individually works best at just one point and that it can fall apart quicker, as one moves around in the sound field than if tuning the bass drivers in stereo pairs.... Maybe when I get to that point of experimentation with this new system my mind will change again. Getting all the drivers in sync, at one small sweet spot, renders higher accuracy than what is achieved by averaging responses over a general area, and is less involving to get results.
Yeah thats about the same as 4 - 18's and 4 15's......I've only got 3 more drivers.. Factor in that I am trying to stay around half xmax.
When listening to sub bass sine tones, at very low, excursion like <2mm you can hear a very pure tone.... as you increase volume, if the sound changes...distortion. I don't think anyone whos here right now can do 120db low distortion, sounds like you guys are way to close xmax to me. 22mm and 24mm thats a pretty large number. I guess if you've got a huge amount of room gain going on then results may vary. @gedlee I would imagine that sealing room helps in this regard?
Last edited:
Another thing; What about the effects of system or driver volume on IR. As we increase volume, we hear less room and more of the driver. Soooooo how is that fair to say that source radiation to room reflected energy ratio, is always static, in the omnidirectional spectrum? This is another reason why I would think that increasing radiation area, lowers rooms final contribution. How am I wrong?
Are you sure you sure you really mean a retaining wall? Sorry to be picky but I’m an architect 😀