Originally Posted by the_sextein
The wait can be a bit agonizing at times but I have to say that it makes me very happy to see this information. The driven and inspired perfectionism to get the extra 1% and take full advantage of the hardware combo that the TV18 utilizes is what separates ID companies from the rest and makes the wait worthwhile. It's good to see that your eye is on the competition and trying to match or surpass the competition even if it's by a small amount is a great thing to see as a customer. Thanks for all of your hard work Tom. I can't wait to see how the TV18 bass curve responds to my room, it looks very promising.
I appreciate it the-sextein.
All of this frequency shaping can take a long time. There are a few things casual eyes should key on.
* You want to see a relatively flat shape above 30hz or so. A slight downward tilt is acceptable and often preferable. You want to see a good "tilt" at database? Check the fv18 or our old xv30. You want to see a junk FR at databass? Check the eD sub. When to tilt or not to tilt? That's a long discussion and to be frank some of that information may be the result of thousands of hours of outside data vs. inside listening over decades. For every 100 hour week we put in, doing all sorts of mundane tasks, those hours we can fire up the measurement rig(s) with a new product make it all worthwhile.
20 years ago ALL I worried about was making it look pretty outside. I didn't know any better.(see attached on what a typical outside day was like for me). I would end up with hundreds of graphs. Then I would take all the subs inside and put them in my systems one at a time. Some of the outside-to-inside correlations were easy to identify. Some, not so much. In fact, after 20 years(and thousands of hours), there are still things to learn.
* <30hz it gets debatable. You could ask 10 different engineers who do final shaping and you may get 10 different answers. Some of the big boys(who sell more in a week than a tiny dot of a company like psa sells all year) will prioritize system fail safes. Joe somebody walks into Nebraska furniture mart and grabs a coffee table, comb, 3 musketeers bar, ballpoint pen, bottle of old harper, flashlight batteries, 16 inch subwoofer, and some beef jerky? THAT guy is going to go home, plug it all in, crank all the knobs, and pop in whatever wonderful movie hollywood has cranked out this week with 10hz bass...fast and the furriest 10?
It is a conundrum. With today's advanced DSP we can do a "ruler flat" to whatever (measured outside) if we wanted. I mean, with the TV18 series...10hz could easily be the -3dB point. And a lot of casual observers would oooh and ahhh over that. It would be brought up in every "what to buy thread". It would absolutely lead to a influx of sales. BUT---this really isn't what is going to sound best.
Sat/Sun/Monday will all be good weather days here so everything will be 100% finalized barring a super eruption. I'll post the final curves in easy to read formats in our TV18 thread. If I'm feeling frisky I'll post a wide variety of graphs showing various orientations, NF to port, NF to woof, different phases of development...we'll see. I just got 8 hours of sleep(can't remember the last time THAT happened) and I'm feeling like a whippersnapper. But by monday I might be like "Ghostbusters! Whadayay want??!!!