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lowerFE

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lowerFE last won the day on December 9 2020

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About lowerFE

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  1. That's some very interesting results. Did you find out whether maxing out one channel is enough to break in all channels? I'm the person that SME mentioned on Hypex amp experiences. It does some things very well, but some things are shockingly rough around the edges that I'm amazed they released a product with flaws like this. For example if the total gain on all filters exceed +24dB, the DSP crashes and sends full scale noise to the amp channels. Luckily, it spared the tweeter channel, and luckily the DSP recognizes the crash and doesn't go crazy after a restart. But this is still
  2. Yes I did compensate for the mirror image effect with the exact same technique you mentioned. In the end I settled with ground plane measurements for bass + midrange in order to get the resolution needed in the lower frequencies, and then quasi anechoic gated measurements for HF. The quasi anechoic measurements get really tedious as one would have to compensate for the fact that if you rotate the speaker on a turntable, the axis of rotation is different from the baffle. Because of that the angles and distances are different and it's a lot of work to compensate. Without the correction the
  3. Oh yeah I want that Klippel near field scanner so bad! Especially for this speaker because it's asymmetrical in both X, Y axis and Z to an extent. That's some interesting note on the distortion from panel vibration. Do you have a link to the AVS thread with the software simulation?
  4. I was reading some old posts and saw this and just chuckled. It wasn't done 9 months later. It wasn't done 3+ years later either! I still have another 1-2 years worth of stuff I could do if I wanted 😲 Also, it was crazy how little I knew back in 2016/2017! A lot of the suggestions made much more sense now because I have a much better understanding. Thanks for the immense help from everyone and for putting up with me (who was way over my head) back in the day!
  5. Wow it's been a very, very long time since I've updated my thread. Life got really busy in the past few years and I barely could squeeze time to work on the speakers, so writing about them and sharing it got lost in the shuffle. I want to give a conclusion to this speaker saga and give way to a brand new small speaker design that is significantly better than the Reference Mini in every single way. I continued working on this speaker over the years, and really refined it as much as I could. In the process I realized this speaker's design is actually extremely flawed in multiple ways. Howe
  6. I'm sorry guys, I'm doing a terrible job of updating my thread. This year has just been crazy for me. I'll eventually update! I wanna at least put up a measurement of my speaker, even if it is an older measurement, and the current speaker performs better. There is no smoothing at all in this measurement. I want to repeat this again, because accurate measurements should never be smoothed. The measurements are in 20 degree intervals, 0, 20, 40, 60, 80, 100 degrees. I have measurements in 10 degree intervals, but not for outdoor ground plane. I have limited battery power when meas
  7. OK. Maybe I should finally start updating this thread after so long. Sorry guys, I was just really busy, and still am. Writing takes a long time, and I've always just put that on the back seat since more time writing = less time improving speakers. Here's a sneak peak of what's coming up. Since this is data-bass, here's a preliminary 1m ground plane output compression measurement of a single speaker without a limiter on. Once a proper limiter is done, I will be extending the sweep all the way to 115dB.
  8. I love testing season! Very nice results. I wonder if the driver is different. The 50Hz and up output is roughly 3dB lower than the Cap 1400 despite having nearly twice the amp power.
  9. I respect Harman's research as well. Very thorough and well executed. However, there is a weakness. The research, and all of its data is based on existing speakers back in the day. Essentially, it is just simply finding out the most preferred speaker that has already been made. It makes no attempt in finding the theoretical optimal sound signature. Therefore, if there is a sound signature that is preferred over anything else existing on the market, but does not currently exist in a speaker due to technological limitations, then it would not be found. A subjectively flat response is exact
  10. I am not saying old people don't like extended treble response. I'm saying people with hearing damage don't like extended treble, and that is generally old people. That's like saying good speakers sound good, and they're generally expensive. Doesn't mean expensive speakers are good, just happens that expensive speakers generally sound good. There are lots of older people that love the sound of my speakers. Had a retired man who cranked metal music on my speakers, and cranked it LOUD, and he told me it had the best cymbal crashes he's ever heard! There is a WORLD of difference bet
  11. I'm long overdue for an update. I've actually lately been too busy simply enjoying these speakers or giving people demos of these! But there were actually a number of big improvements that made night and day differences to the sound quality of these. I will talk about them over a number of posts. This post will be about my discoveries in sound signature preferences.The Universal Sound Signature PreferenceI'll start with a story. I brought this to an audio enthusiasts get together a few weeks ago as a bunch of people want to hear this speaker I've built. I set the speakers up in my friend's roo
  12. So after reading this thread over the past year and amazed and the technical depth and extreme attention to detail paid to the tuning of this system and going "man I really want to hear this!", I flew and went to check out this system. And boy what an amazing system to listen to! My mind was blown as I was amazed by one thing after the other. All the work put into getting the tonal balance of this speaker correct really paid off big time. The whole system just sounds really "correct", and the more I listen to it the more I'm amazed by it. I brought my Reference Mini's with me as a compar
  13. Very impressive results for such a small cabinet, driver size, and low cost. Of particularly noteworthy aspect of the performance, which Jeff kinda pointed out already, is how little difference there is between the long term output and burst output. I've never seen a passive system driven by a K10/K20 report such small differences. I wonder what's going on. In one way it can be seen as excellent design that maximizes long term output, in another one could wonder what's going on with the drivers that they can barely handle 100V during burst testing. Anyone wanna chime in?
  14. Little update. I just moved last week for a new job, so I didn't get a chance to really work on the speakers much to deal with moving. But for something fun, I improved the limiter design a bit to get a bit more maximum clean bass output from the speaker before the limiter clamps the output. I've wrote a lot about my speakers so far, but this time here's a video of the Reference Mini's doing ~107dB of bass and 109dB peaks. The listening position is about 8 feet from the speakers. For reference the TV is 40". I promised there will be bass!
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