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Upcoming Testing Possibilities?


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#1 jpmst3

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Posted 26 September 2013 - 10:59 PM

Hey Guys!

 

Other candidates for the list"

 

lilmike's Lil' Wrecker

 

Is there another round coming soon?

 

Awesome site!!!!!  Great work!


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#2 Ricci

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Posted 27 September 2013 - 02:24 PM

There is always more stuff coming...Commercial stuff, a couple Audioholics reviews, drivers, more sealed/ported/TH tests with various drivers and another one of my crazy projects I've been working on for over a year and a half. I would like to measure a LilWrecker or a THT but I'm not building/buying one just to do it and I don't see anyone sending me one of these.


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#3 lilmike

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Posted 27 September 2013 - 08:11 PM

While I don't have the gear Josh has, I wrung out the LilWrecker pretty well in testing. I beat up the F-20 pretty well too. Compared to those two, I have literally pounded on the MicroWrecker, but I haven't measured "good" data yet. The MicroWrecker test mule has been through 4 separate days of measurements, each one taking it to well past the driver's thermal limit. Thus far, there have been issues with the temperature or the setting (or both), or something went wrong with the electronics. No data I'd hang my hat on just yet.

 

Josh and I have shared some data along the way. Unfortunately, nothing I do is really useful on this site. We use different gear and we use different methodologies in testing. Though I could change my approach to match what Josh does, I can't exactly afford the gear and software he uses, and even if I did, there would still be variations due to other factors, like elevation and measurement setting, cause I'm nowhere near Louisville. 

 

I'd be happy to adjust my approach in my future measurements to more closely parallel what Josh does if anyone thinks there's a benefit. CEA distortion testing is something I'd like to add, but so far, implementing it in REW is a bit cumbersome. As far as the other items? It's not too hard to adjust the drive level to measure 1 watt into the DCR, and I can certainly measure at 2M groundplane. 

 

One of these days, I will get back out to my shop, uncover the speaker-making tools, and start on my new builds. Lots of ideas...


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#4 Ricci

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Posted 28 September 2013 - 09:55 PM

Mike,
Really the major costs are in the program to run CEA which is like $750. Otherwise you need the biggest honking amp you can find and a decent spl calibrator for the mic. The rest of the components aren't too bad individually, a decent sound card, microphone, cables, dmm, dcx2496 or similar, etc...But it all adds up.

If you ever wanted to format your measurements to match the ones here it wouldn't be difficult and I'd be willing to help out.

#5 maxmercy

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Posted 28 September 2013 - 10:26 PM

I may have a THT to send your way early next year....

 

JSS



#6 lilmike

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Posted 29 September 2013 - 10:51 PM

Mike,
Really the major costs are in the program to run CEA which is like $750. Otherwise you need the biggest honking amp you can find and a decent spl calibrator for the mic. The rest of the components aren't too bad individually, a decent sound card, microphone, cables, dmm, dcx2496 or similar, etc...But it all adds up.

If you ever wanted to format your measurements to match the ones here it wouldn't be difficult and I'd be willing to help out.

 

As I'm in the early part of a remodel project that will consume every spare dollar I have for the next 4 years or so, I can't drop the coin on the software at the moment. If I recall - you use some custom scripts and a graphics and acquisition package that looks super cool. 

 

I have mics and an SPL calibrator. I don't have a VI box, so no high-power impedance sweeps. As far as amps, what I have is bigger than the drivers I own, but to be honest - that isn't saying all that much. 

 

Definitely interested in the formatting, as well as adjusting my technique to more closely parallel what you're doing though. We can take this to email s or PMs to discuss the protocols if you want. I'm not going to me measuring much any time soon though. I've read the "know-How" section of the site, so it looks like I'm on the right track, with just a few adjustments needed.


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#7 Ricci

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Posted 01 October 2013 - 02:43 PM

Mike have you seen how much I use the VI Box? Hint...It is not much. It is a whole other setup and calibration from the other tests and it is yet another brutal torture session for the drivers. I still plan to use it but sparingly on certain systems. Plus it is a PITA getting it to work with REW. I really need LinearX to take better advantage of it and that is another large chunk of $$$.

 

Overall my game plan with DIY drivers and such long term is to only test most drivers in a basic capacity with a sealed test which is enough for the easy comparison with other drivers performance. Then move on to others. For certain pro drivers which really are intended for bass reflex apps they will get tested in a standard BR box also. The goal is to identify a driver of each size that performs really well in most aspects and sets the bar. For example the LMS 18". Then this "bar" driver will be tested more thoroughly in more types or sizes of enclosures, with VI box, used for other tests not related to one system specifically, etc. That way the performance of the "bar" driver in a variety of situations can be compared and the results can be used to make well educated guesses as to how other drivers tested in only the standard sealed or vented enclosures would perform in the other alignments that the "bar" driver was tested in. So instead of having to test every driver in a 16Hz tune 9 cube dual 18" PR alignment We will be able to test just one the "bar" driver in that system and compare its change in performance in the PR enclosure vs the standard sealed enclosure and that will tell us a great deal about how the rest of the drivers would perform in the PR enclosure.



#8 lilmike

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Posted 01 October 2013 - 03:41 PM

That makes complete sense. A testing day is long enough without adding in high power impedance.

 

Glad I don't "need" the VI box. I want to measure impedance at more than flea-power levels though - the shifts with increasing displacement may help explain the changes in observed frequency response. I can do that with a homemade rig though, I have several of those now. 

 

I'll adjust a few things next time I test a cabinet, then share the data with you. Hope I can provide enough to work with. 



#9 Ricci

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Posted 06 November 2013 - 04:21 PM

Any other suggestions for commercial subs, pro subs or drivers to be tested?

#10 lilmike

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Posted 06 November 2013 - 04:37 PM

They're not cheap, but have you looked at the new Fi SP4 and Team series at all? Basically, they look like Fi motors on TC baskets. I'd love to see a Klippell of the motor linearity. 

 

As far as pro drivers? Some of the new B&C drivers look pretty nice, but the good ones have price tags that match their specs...



#11 Infrasonic

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Posted 06 November 2013 - 05:43 PM

Commercial subs: JTR Captivator, Orbit Shifter, Seaton Submersive (i know there are variants of all these, whichever you choose)

 

DIY Drivers: Mach5 'Phallus', Aura NS18, SI 24", Dayton Ultimax15

 

Pro Drivers: AE TD18h+ (hopefully repaired and then fully tested ;))

 

Sorry. I know these aren't cheap but these are just things I know I'm interested in that I can think of.



#12 Ricci

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Posted 06 November 2013 - 07:03 PM

As far as the Fi drivers I would like to look at those but I suspect they will perform like the rest have. Huge inductance hump with high levels of 2nd and 3rd harmonic distortion. Also makes it difficult to design accurate higher order systems with them without actual testing. They are rugged with plenty of stroke but they do not seem to like doing deep bass without a lot of HD which is also partly due to the very stiff suspensions. In car or a small room that may not be anything to worry about though. Seems to be typical of most of the heavy duty car subs not just Fi though.

#13 Kyle

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Posted 07 November 2013 - 07:03 PM

A birdy told me the prototype LMS-R2 will be ready for testing soon. I'll try and get a beta version here from TC. Keep fingeres crossed.



#14 Infrasonic

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Posted 08 November 2013 - 04:55 AM

A birdy told me the prototype LMS-R2 will be ready for testing soon. I'll try and get a beta version here from TC. Keep fingeres crossed.

 

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#15 FOH

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Posted 08 November 2013 - 04:43 PM

Commercial subs: JTR Captivator, Orbit Shifter, Seaton Submersive (i know there are variants of all these, whichever you choose)

 

DIY Drivers: Mach5 'Phallus', Aura NS18, SI 24", Dayton Ultimax15

 

Pro Drivers: AE TD18h+ (hopefully repaired and then fully tested ;))

 

Sorry. I know these aren't cheap but these are just things I know I'm interested in that I can think of.

 

 

^ This ... good stuff, especially the Orbit Shifter. Although I'm an IB/multiple sealed dude, I suspect the Orbit Shifter is really something special, whereas a properly blended pair would likely please even the most hearty appetite. The SpeakerPower amplifiers are a huge component of the success and subjective goodness that both Seaton and JTR enjoy. Those amps are everything most anyone wants in a sub amp. 

 

So yeah, like Infrasonic, I'm interested in the OS being tested too. I know full well what the SubM is capable of.

 

Again, I agree with the Utilimax, the SI 24", and the AE TD18h+

 

Admittedly, all that is a wish list and maybe tough to pull off, but it'd sure be interesting reading.  

 

 "prototype LMS-R2"  B) 



#16 maxmercy

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Posted 08 November 2013 - 06:29 PM

LMS-R2 = less inductance?

 

JSS



#17 lilmike

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Posted 08 November 2013 - 09:54 PM

Here's to hoping that the LMS-R2 has a bit of motor innovation I read about a while ago.

 

Fingers crossed here too, I would love to see the state of the art advanced.



#18 FOH

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Posted 08 November 2013 - 10:49 PM

Here's to hoping that the LMS-R2 has a bit of motor innovation I read about a while ago.

 

Fingers crossed here too, I would love to see the state of the art advanced.

 

thanks for that



#19 Infrasonic

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Posted 09 November 2013 - 08:29 AM

Here's to hoping that the LMS-R2 has a bit of motor innovation I read about a while ago.

 

Fingers crossed here too, I would love to see the state of the art advanced.

 

Ooooofff. I tried to read that and...

 

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#20 Kyle

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Posted 09 November 2013 - 12:09 PM

LMS-R2 = less inductance?

 

JSS

 Yes, a lot less

 

It won't use the variable resistive coil as that is not developed as a product yet but its a 3" coil, copper over the poll, larger magnet.






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