sony buyout

[thinkbrown]

Re: sony buyout

Based on the distortion measurements on the front page, the 5khz peak doesn't look like distortion. I'm not expecting super high performance and I want this to be cheap (why I'm using piezo tweeters), so depending on how it performs, I might not even cross it over and simply EQ any issues. I figure: as long as it plays really loud I'll have gotten my $16 worth.

If I were to do a proper crossover, I'd cross it around 2k, and pair it up with a compression horn tweeter (or array of such). I'm not a fan of super complicated crossovers, and I try to avoid anything with a slope steeper than 12db/octave. I'm not overly concerned with the response at 1.5k since the difference is about 5db, compared to the ~10db peak at 5khz.

[XtremeRevolution]

Re: sony buyout

Based on the distortion measurements on the front page, the 5khz peak doesn't look like distortion. I'm not expecting super high performance and I want this to be cheap (why I'm using piezo tweeters), so depending on how it performs, I might not even cross it over and simply EQ any issues. I figure: as long as it plays really loud I'll have gotten my $16 worth.

If I were to do a proper crossover, I'd cross it around 2k, and pair it up with a compression horn tweeter (or array of such). I'm not a fan of super complicated crossovers, and I try to avoid anything with a slope steeper than 12db/octave. I'm not overly concerned with the response at 1.5k since the difference is about 5db, compared to the ~10db peak at 5khz.

Well, I don't look at it as only 5db. From what I've heard, a 10db increase represents a 2x increase in perceived loudness, so you're looking at a 50% boost at those frequencies and its something I prefer to fix one way or another. The other problem is that baffle diffraction for a typical baffle width for these drivers boosts that frequency even further, making a bad problem even worse.

I tried, but couldn't figure out a way to cross this driver any higher than ~2500 without having that 5khz peak start bringing up the high end output by more than anything I'd be comfortable with on even a budget crossover.

The way I look at it, the fact that the driver is so cheap is merely a bonus that should be taken advantage of, and should be combined with a few extra crossover parts to make it into what it should be, instead of going all out cheap and trying to live with its deficiencies for the sake of saving a few bucks.

I'm still working on a WWMTMWW by the way.

[thinkbrown]

Re: sony buyout

I look at it as an EQ issue. This driver has several problems that are rather expensive to solve with a crossover. For the cost of the driver, it makes more sense to EQ it in playback.

By the way, in your WWMTMWW, is the Sony the mid?

[Sydney]

Re: sony buyout

Question to them that can measure off-axis response:
Is the 5khz response peak consistent at various points off-axis?

[XtremeRevolution]

Re: sony buyout

I look at it as an EQ issue. This driver has several problems that are rather expensive to solve with a crossover. For the cost of the driver, it makes more sense to EQ it in playback.

By the way, in your WWMTMWW, is the Sony the mid?

I do believe it can be an EQ issue, but I can't assume that everyone has an EQ that they can use to fix the issues. Its not very expensive to fix with a crossover. My last TMW crossover was for these speakers was ~$50 for the pair and it was relatively linear. It completely knocked the 5khz resonance out of the park, tamed the 1.5khz bump reasonably well (considering it was compounded by baffle diffraction), and kept impedance above 4 ohms.

In the WWMTMWW, the Sony is the woofer and is crossed somewhere near 1000hz. The mid is the Tymphany 2" driver, and the tweeter is the Dayton ND20FA. What the Sony drivers lack in power and excursion, I believe they will make up for in sheer cone area.

The total cost for the TMW design was $80 including the cost of the sony drivers and the speaker ports, but not the terminals. A WWMTMWW will not be significantly more expensive than that. Figure $2.07 for the extra 3 drivers and another $5 for the tweeter, and you're still under $90 for a WWMTMWW with a (IMO) great frequency response and great phase alignment between the mid and tweeter.

[thinkbrown]

Re: sony buyout

I've been trying to come up with a good crossover, but so far (working with piezo tweeters, which are difficult to cross over) the best I've come up with is the crossover i mentioned earlier (brings the overall response to +-3db 100-5k). I used your frd and zma files to model it.

[XtremeRevolution]

Re: sony buyout

I've been trying to come up with a good crossover, but so far (working with piezo tweeters, which are difficult to cross over) the best I've come up with is the crossover i mentioned earlier (brings the overall response to +-3db 100-5k). I used your frd and zma files to model it.

What is that an image of that you attached?

[thinkbrown]

Re: sony buyout

the woofer with a 2nd order LR lowpass

[XtremeRevolution]

Re: sony buyout

the woofer with a 2nd order LR lowpass

Doesn't look very good to me. I'd be more comfortable with a tank on that peak and a lower crossover.

[thinkbrown]

Re: sony buyout

It's within +-3db, so I'm fine with it. Considering the less than stellar response of piezo tweeters, I don't feel that it'll be an issue. I got the box of drivers today, so I'm experimenting with EQ stuff.

[r-carpenter]

Re: sony buyout

Question to them that can measure off-axis response:
Is the 5khz response peak consistent at various points off-axis?

of cause :p
it decreases with the magnitude off-axis but it's there.

[thinkbrown]

Re: sony buyout

Made some 8" wide test baffles today. With a simple EQ notch at 5k, they sound pretty decent I'm gonna try and get the wood to build the full line array soon!

[nottaway]

Re: sony buyout

So is there a suggested baffle size which would work favorably with a line of 12 with a center mounted tweeter? Id like to get started with cutting all those holes and doing all that solder work......

[r-carpenter]

Re: sony buyout

hohoho!

[r-carpenter]

Re: sony buyout

2.83v on the terminals. Level adjusted on pink noise at 1 meter with SPL meter (nothing fancy, $60 PE deal).