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MEADOWLARK AUDIO SHOP PICS

Of much more interest is the 90s era digital storage scope over my left shoulder. It could store eight waveforms on a 5" floppy disc. Zoomy stuff for the time but, man, what a relic!

I used it to compare tone bursts while developing LF systems. I had to be able to store them long enough to take the side panel off of the test fixture, adjust the inner baffles on the TLs, then compare results. What a time consuming PITA! I musta been nuts!

At the time everyone's top tool was the FFT analyzer, which gave you almost no useable view of LF rise and settle times vs frequency, because to the sample length needed to look at low bass was way, way too long, so you saw mostly room. The problem only worsened at high amplitudes, which is where it matters most. Guys had no idea why their bass systems screwed up when pressed, because they didn't look.

(Actually the prevalence of the analyzer brought about the practice of only looking at small signal behavior for most things. Big mistake. It became an FA world, while skipping past timing and dynamics which are, if anything, of equal interest. )

I'd run gated sine wave - baseline, then four full cycles, then baseline - at a range of powers. You could see all of the troubles plain as day.
 
Yeah, I've been away on a non-business obligation for about 6 weeks, bit have returned with a little glint in my eye. Two, actually.

An idiotic 8 x 8", 4 x 500W LF system to accompany an Ibis redux / upspec.

And, perhaps, a departure from the thrust of the line, into a more modest price point. That will depend upon my partner's willingness to take the project away from me post dev.
 
Yeah, I've been away on a non-business obligation for about 6 weeks, bit have returned with a little glint in my eye. Two, actually.

An idiotic 8 x 8", 4 x 500W LF system to accompany an Ibis redux / upspec.

And, perhaps, a departure from the thrust of the line, into a more modest price point. That will depend upon my partner's willingness to take the project away from me post dev.
Hey!
You said you wouldn't do that! :)
 
Hey!
You said you wouldn't do that! :)
What? The "affordable" idea?

Guys are after me for it. My partner put a really clever idea in front of me, hard to resist....

Yeah, I selfishly only want to spend time working and listening at the edge. But maybe some of that edge experience will reflect backwards on a conservatively priced build. I'm kinda getting drawn in.
 
I suspect if you do this and send them to these YouTube reviews your exposure will expand exponentially. Maybe get them to some audio shows too. You are building future fi, so i think your possibly onto something with a wider market population.Looking forward to see this evolution.
What? The "affordable" idea?

Guys are after me for it. My partner put a really clever idea in front of me, hard to resist....

Yeah, I selfishly only want to spend time working and listening at the edge. But maybe some of that edge experience will reflect backwards on a conservatively priced build. I'm kinda getting drawn in.
 
I suspect if you do this and send them to these YouTube reviews your exposure will expand exponentially. Maybe get them to some audio shows too. You are building future fi, so i think your possibly onto something with a wider market population.Looking forward to see this evolution.
Thanks. Indeed. I've occasionally teased myself with the idea of exhibiting at a show, getting the room right across from the guy debuting his new 375,000USD passive four way, and obliterating it with my 60K active. I know there'd be no contest, so it's so damn tempting. But nah........I honestly am not interested in setting up a production plant, employees, and all of the headaches that once nearly killed me. I'm really happy building a handful of monsters each year and practicing my goofing off. And maybe some more modest stuff if we can work that in. ;)

<<<<>>>>

Here's something that may be of interest to the DIYers among us: the process of woofer characterization. When we were doing vented alignments a good handful of considerations needed to be worked out - ALL COMPROMISES - to make that resonant system work well. Now for a Next Gen bass alignment, we only need to answer one question: What is the box volume that delivers optimum transient performance?

That will be the first step in qualifying a candidate driver. Once done we'll have two data in hand: 1)Does the driver perform up to our subjective standards? and 2) What is its ideal volume? If #1 is Pass, we now have a number that will follow that driver thru any number of design iterations.

So, duh simple, we make an intentionally oversized quick-and-dirty box out of cheap stuff, observe the output, then toss in blocks of known volume, in this case 50 cubic inches each.

20231116_140638.jpg

Earlier in my career I used to run an F adjustable gated sine wave: baseline, four cycles, baseline, and observe on a scope. I found out pretty quickly that identical results can be had with ears and familiar percussive test tracks. Today the process took an hour, starting at 1520 inches, and ending at 970 inches. I irked my partner by pre-guessing 1000 inches based on the feel of the suspension and, of course, the emissive area.

The driver here is the SB23. We're already using the SB34 seen at left and love it, so we did expect the 23 to make the right noises.

So, that was easy, we're good to go on a proto.
 
@Pat McGinty Sorry if I’m not keeping up. My knowledge is less than limited. Are you still using Satori speakers? I think those incorporate beryllium in some way. I seem to recollect that those are your current speakers of choice?
 
@Pat McGinty Sorry if I’m not keeping up. My knowledge is less than limited. Are you still using Satori speakers? I think those incorporate beryllium in some way. I seem to recollect that those are your current speakers of choice?
Thanks, yes, we're standardized on the Satoris, just great cutting edge drivers. Our tweeter of choice runs a beryllium dome. Clean as a whistle, doesn't choke when goosed really hard.

SB Acoustics makes the Satori line as their top hifi line, and sells the rest of their hifi line plus their pro line branded SB Acoustics. The Satori line contains no subwoofers. To me, it almost makes little sense for a line known for its finesse to include beastly LF pumps.

Same designer, a guy who figured out, against the prevailing grain, that a subwoofer could run a soft suspension. The softish SB34 with big motor force knocked our socks off with resolution, so we've assigned it to below 70Hz duty in Merlin.

The idea I'm poking at with the 23s is running eight per side on four 500 Watters, as an array, four forward, four aft, as coaxial pairs, for just low bass.

That gets us more displacement than a pair of 34s, and a slightly higher Force / Working area ratio. Expensive, though. But a relatively compact array could hit pretty damn hard with no wobble.

Having broken thru the old limits, I'm realizing that there's still so much more work to be done in the bass.

And, alterior motive, I'm fooling around with fooling myself against my better judgement into making a modestly priced, meaning below 10K, three-way.
 
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