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OscarJr
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- OscarJr
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Comments
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How the heck is everyone!? I joined sometime back but kinda disappeared, even though I still have ambition to work on my speaker project, but work took precedent. Lots of stuff happened recently, got laid off in May, just recently found a new job/…
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I've noticed that here and there and just figured each vendor/mfg has their own set of compromises to make when it comes down to the bottom-line $$$. So some share the motor like you said, but some do beef it up when it makes it to the 15"/18…
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(Quote) You can build a test box of similar size out of something cheap like OSB. At the level that impedance sweeps are done, the material of the box won't matter all that much, not like it's going to flex a whole lot on ya. Also, I'm w…
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I would minimize the bend radius as much as possible to prevent the outer portion of the column of air from suffering from frictional losses at high SPL. If you don't play to utilize the woofer at high excursion, then it won't matter much. But if …
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(Quote) I think Floor is more talented overall, but Annette did an unbelievable job on both Dark Passion Play and Imaginarium. I really liked her voice too. I actually lost my Imaginarium CD a few years back, but since I ordered the new a…
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I've just been Floor'ed. Literally. The new Nightwish album with lead singer Floor Jansen is unbefuckinglievable! :o Tuomas Holopainen is a freaking genius. Right up there on the same level as Devin Townsend. Their abilities transcend beyond …
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Only if you have beefy speakers can take a beating.... https://youtu.be/05kemovfEzA https://youtu.be/ylRINLhmkyI
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I'm ordering a pair as soon as they hit the US shores.
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Beyma just sent me their measurements for the 10MCB700......going into analysis-mode....please hold......
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Beyma just announced what looks to be a ferrite version of the 10MC700Nd, the 10MCB700. On the website, but not in production yet. Might have to snag a pair just to see what is what! Doubt it's better than the 10MC700Nd, but you never know! http…
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Too many things have gotten in the way, due to work. I never got the bass driver test off the ground unfortunately, lol. Mostly just too swamped at work, as I am right now, lol.
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Nope. I'll tell you, only because you're gonna help me with crossover design. ;)
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Oh I already have a pair of the Beyma TPL-150H's. They're awesome. I'm wondering if I can make those even better as well! But those extra diaphragms are $120 a piece!
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I know, I was just saying with respect to matching a low-mid driver to it. :) Come to think of it, I think 2nd order went up just a tad with the 4001's if I had to guesstimate. But there is a greater separation between 2nd and 3rd order. More tes…
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The 4001 responded as well, but I think the "lesser" type modification that I used was perhaps "too much". The energy of the resonance around 2,250 Hz ended up shifting into the 1kHz range, as well as a little bit more 2nd order…
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Initial measurements of a stock RT-4001 taken, with initial conditions (relative drive level, mic distance) notated. Diaphragm modified. Patient is resting in ICU, expected to make a full recovery in 24 hours. Next measurement tomorrow. This one…
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Don, you should take a look at the Purify 6.5inch'er if you haven't already. https://hificompass.com/en/reviews/purifi-audio-ptt65w04-01a-midwoofer look at that stupid low HD performance! Only other commercially available cone transducer with ha…
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Those are near-mic measurements of just a couple of inches, so they are not absolute to the scale that is showing on the graph. There is no way they can produce 120 dB @ 1m with out blowing up. That would be a 100W RMS sine wave sweep. That is …
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Four modded RT-50021's headed out to a customer in Los Angeles, CA. : B) (Image) I can modify each diaphragm and reassemble the tweeter back in about 30min. So, all in all not that bad. While I was modifying these tweeters, I kept thinking…
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RT-5002 including the original X-thread diaphragm. Thoughts? I really like the 3rd order reduction on the heavily modified version from 1,5kHz to 3kHz, but it would need a steep filter to really kill the output and HD near 1k. (Image) So I gue…
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Just to clarify, these tests are at ear-piercing levels with just one tweeter. I have to wear both earplugs & earmuffs as the highs are deafeningly loud even with just a few watts on a single tweeter. I do that to see the large-signal behavio…
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By the end of the week I hope to test out the RT-4001 modified diaphragms.
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And finally for tonight, I managed to take the heavily modified 5002 diaphragm and "turn it into" the lesser modified diaphragm that I smoked earlier. So I took readings in the same location, same drive level. The only one missing here …
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Here is a stock RT-2005 vs a modified one (similar to the 5002 diaphragm that I just smoked). Interestingly, the huge peak in the distortion that I had previously measured is not there in the stock one. Which leads me to think perhaps it was an a…
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Here is a stock 5002 vs the 2nd heavily modified one. I haven't ran the charts/numbers but aside from that rise in distortion near 1kHz, I see an overall reduction in average THD from 1.5kHz+ and a huge decrease in average 3rd order HD from that sa…
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Darn it! I twitched and moved the volume up too much at a time and smoked one diaphragm on the 5002! lol. The other surviving diaphragm shows promise, but I think the other one was the ticket! I better be careful as I only have 8 diaphragms left!
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I'm hoping I didn't go overboard with this new modification. The only thing I worry about is the accumulation of distortion in the upper frequency range. I noticed in the previous iteration, there was a tiny peak that showed up as a positive gain…
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Modified a 2002 and two 5002 diaphragms last night. Hoping to get to test them today or tomorrow, to see if my cojecture holds water. No I'm not gonna say what I did. Not without a signed NDA. :) If it works, I will try to get the idea sold to …
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Haven't forgotten about this. Work comes first, and I been swamped this semester! I'm on vacations for two weeks starting on Saturday, and I'm excited about continuing my work on this! =)
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Hehe, different category of bass, but nice no me the less. I'll take it. :)