Kyle
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Posts posted by Kyle
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good to know!
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Which is more blinding for you? the forums or db.com?
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On 9/14/2019 at 2:19 PM, peniku8 said:
Just a small thing, but I noticed some odd behaviour.
My iPhone (6, running IOS 9) automatically pauses music playback when another app starts playback. That's not the case for just any audio source, as some games allow background music playback from the music app.
When I load the data-bass forums via Safari on the phone, my music pauses thou. Even if theres no sound from notifications being played, this always happens when loading or reloading a page here.
Music playback is usually resumed when the other app is not sending the "request audio solo token" (I made that up, hope you get my point) anymore, but for data-bass it just pauses indefinitely.
@peniku8 Interesting. i dont have an iphone, so I can't check, but try this.
Go here:
http://data-bass.ipbhost.com/notifications/options/
Turn off "play a sound."
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Cool stuff!
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Awesome video @Jeff Permanian, thanks for sharing.
I see the TC Sounds 18" frame 😉Dead right about high excursion + good sensitivity, I think you're figured out that threading that needle you do get the best of both. Nate's drives along those lines too.
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Its not so much the size, but most pics don't need to be too big, Maybe delete older ones you have uploaded in your profile but also what greatly helps is saving photos as a jpeg with a reduced quality. Really large photos can be just a few hundred k.
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Nice job with the bend!
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This driver is nuts!
I need to see this thing run against the 24vU https://www.harbottleaudio.com/24vu.html
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On 3/21/2016 at 7:07 AM, Ricci said:
Actually there is objective data and detailed measurements on the first generation F113. Illka tested it thoroughly over at HTS forum back in probably 2009 or so. It's probably buried in an old archived thread there. I seem to remember someone else also doing a pretty thorough set of measurements on one. There is no reason to doubt that data.
JL has updated to a version 2 of the Fathom line, but a quick glance shows that the driver size is the same and the driver appears unchanged. The amplifier rating has seen a modest bump to 3kW peak up from 2.7kW which is less than 0.5dB of difference. The rest of the change appears to be to the auto-EQ system. There could perhaps be some tweaking to the dsp in the amplifier as well. Performance of the v2 could perhaps be slightly better than the original but it will be a very subtle advantage and not anything huge. I've seen and heard the F113 before. It is a capable subwoofer especially considering its size. That is its main claim to fame is the output it has relative to its size. It also is built very well (USA made), uses quality parts and looks great in person. I'm not a fan of the HPF employed below 18Hz as that sort of defeats one of the main advantages of a sealed system. Otherwise it is a capable performer but very expensive.
Dgage is right...I could possibly approach JL Audio about them sending a unit in to be evaluated but that is not something that I do. I've got more than I can handle already from other parties who are already prepared to send their products. I'd rather work with those who are interested rather than try to persuade a company to be interested if that makes sense? I get an email about once a week from a random person that says something like..."Do you plan to test the SuperWoof 9000? Please test this sub. I really want to see how it does. Thanks." What these types of people should be doing is emailing the manufacturer about it not me.
I asked an engineer at JL about 2 months ago for a Gotham... somewhat jokingly (I think its $13,000 or something)
negative on that unit so far.
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9 hours ago, Wayne said:
I’m not a speaker designer but I see no reason that the max 20hz output should be linear with volume. There is a lot more going on here (e.g. the amps have different capabilities, driver excursion is different , etc.) looking at the 3 JL subs which have similar designs the output in dB looks pretty damn linear with volume.
Sure, by no means is this wrong and everything on the y-axis is relative so it does work, just means means its windows to a set of dB that makes sense which is already done. Josh has wanted to add this data to the site for a long time now, maybe its time to get it baked in
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I really like this idea and concept of comparing output vs size. I think one shortcoming with this graph is that SPL is on the decibel scale which is not linear, but we can think of box volume as linear. What we should do is convert SPL to Sound intensity (assume sea level for air pressure -- close enough). Once we have a linear scale for output and a linear scale for volume, I think the graph can have more meaning.
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Seems reasonable, too much is never a bad thing either, just means it won't clip.
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Awesome build!
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Is there a US distributor for the 214.50 ?
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wow!
Based on the new sealed system max output tests that Josh just posted it looks like it outright beats the B&C in the midbass region and matches it everywhere else.
Both of these drivers are beastly...
https://data-bass.com/#/systems/5d02b177d6b2560004ebe49e?comps=5d03f339d349e90004d8fcd5&_k=ok0919
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6 hours ago, Planet said:
i'm just an old clueless rock'n roll grunt half deaf after 30 years of in & outs, so i gotta ask are any of these of any use in a subwoofer?
http://www.b2audio.com/wp-content/uploads/2016/09/xmv2_man.pdf
Looks exactly like the older Eclipse Ti subwoofers made by TC sounds, but that Qes is very high so that would be sealed box type of woofer.
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20 is way more than it needs, but keep in mind, the size of the box will help the size of the port. Almost all ported boxes are going to experience compression with enough power. A 20 cubic fox tuned at 20 could have a very large port compared to a box half the size. The hump is going to flatten with compression at higher volume. If you have the space, bigger will be better in this regard, but how much it helps will only show at higher power levels at around tuning.
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Make get some ideas from Wisdom,. they specialize in in-wall solutions. TC used to make their drivers for the subs.
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RIP Tom, but this reminded me of his IB
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1 hour ago, SME said:
I haven't looked much into the mechanical side of things, so I'm curious and rather fascinated that this issue exists.
Are you more concerned about the effects of pressure inside the cabinet or the reactionary forces from the drivers? I may be missing something, but I doubt the pressure inside the cabinet (alone) is likely to get high enough to threaten anything structurally. Though I expect that if pressures get high enough, new forms of non-linearity come into play which could increase distortion substantially.
On the other hand, I can see how reactionary forces from the drivers could be a real issue.
Normally when subs break things is a resonance dance.
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I would like to see the MAUL with 4 K20's on it. We would need a 600 volt feed from the power company at least.
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I'm just so picky about Qes, I wouldn't consider the SWR-12D2 for pretty much anything since I like small boxes. I honestly still like the god damn Lab-12C, but it does fall show in xmax. It would have to have more magnet to maintain its SPL / Qes if xmax was to increase. Eminence, give us a Lab-12 Ultra please! 1.8ww coil, 7.5" magnet We had a prototype TC-9 exactly like that (used a 3" coil of course, not 2.5") and that thing hard with 1000 watts - pro cloth surround. About 1.8" long coil -- not expensive by most accounts.
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Well, lets ask it this way, will this thing beat 2 Skhorns? Its bigger than 2.
B&C 21DS115-8 | Measured Complex Inductance Parameters
in Bass Gear
Posted
I would not expect it to be significantly different than the 4 ohm. If anything, a bit better (in the direction of less inductance that is.) Reason for that is you typically drop wire cross section going from 8 to 4 while keeping the same number of layers. The gaps on the 8's are normally tighter as a result.