Dayton Audio RST28F-4 W/ SEOS Wave Guide.

[xmax]

See new thread "Into The Abyss", Tweeters in low places.

[Altoid]

xmax You are the man! I was just wondering if anyone had successfully crossed over as low as 1600hz with this tweeter. That is very impressive to be able to crossover that low with an LR4.

[TN Allen]

Exactly, and testing in a standard flat baffle.

I'm interested, having thought for some time that midrange drivers in WGs offer benefits, particulary if paired with tweeters in guides that are carefully integrated with the midrange drivers in guides. There are challenges developing and producing a baffle shape that incorporates both. However, in my experience, the effort is worthwhile.

I look forward to reading about your efforts and results.

[xmax]

Blue=RST with a LR4 @ 1.6K.
Red=RST with 6.2uf (only, no active filtering)
With the SEOS-8 on a 19x19 baffle.

The Green trace is a Satori TW29R with NO waveguide and active LR4 @ 1.6Khz.

[xmax]

The RS and RST (W/ SEOS-8 WG, modded on the RST) with a 6.8uf cap AND 1600hz LR4 active filter.
Pay no attention to the distortion the THD measurement was compromised.

[xmax]

The first set of curves is a 6.8uf AND 1600hz active filter, the second set is a 6.2uf in series,
with no other active filtering.

[PWR RYD]

A 6.2 uF or a 6.8 uF series capacitor? Just to be clear!

[xmax]

Again, the second set of measurements used a 6.2uf just to be clear.

[raiderone]

The distortion certainly is very low for a 6dB filter, often there are other issues with first order,
the overlap can be very wide and the tweet and mid being in phase at the XO with the proper
acoustic center, the 2 drivers are likely to be out of phase above and below the XO making
for some funky vertical dispersion. That said I will still try it! Also this time around it was a
6.2 uf cap and the crappy high distortion curves from the other night had the active filter
combined with a 6.8uf. Todays curves had either the 6.2 OR the active LR4.

I really like that you added a 6.8uf cap for comparison and so one could see the effect of the waveguide and the potential simplicity of a 1st order crossover. Please post your results of your attempt at a first order crossover. One of my favorite JBL speakers L100 (or 4312) used only caps on the mid and tweet and it seemed to work well (at the time).

[xmax]

"...RS52FN and friends are waiting for nice Xmax to mount them. ..."

Just curious, what do you mean by the above? I've probably overlooked a previous post and also misinterpreted the above, however, are you planning to "mount" the RS52 in a WG?

Exactly, and testing in a standard flat baffle.

[rpb]

Don't worry I will lose my mind by the 5th page.

I regrettably assumed one could gather the gain had been monkeyed with because of the horn gain and obvious transfer function of the 6dB filter @ approximately
5K via cap. In this case you were right in doubting the distortion curves of those first measurements because they were F%&*ed.

We would never blame a capacitor (or resistor) of reasonable quality of anything. Jerk Face Xmax might say a resistor could cause a suspicious transfer function,
but he is sleeping in. He will have his fingers all over the place soon enough.


RS52FN and friends are waiting for nice Xmax to mount them.

Zaph was onto something with his WG project mainly taking advantage of the huge mid peak created by the WG
dealing with it in the electrical domain made for a useable response whilst letting the tweet creep low in a
leisurely fashion.

Everybody knows drivers natural response needs to be man handled electronically with 37 parts to sound good.

What I like to do to compare distortion, is to match the responses closely by filtering the responses. If you can get the responses within 2 or 3 dB in the range of interest, then the distortion measurements are easier to interpret. If one tweeter is 8dB louder at 2k than another, the results at 2k are not comparable. If your interest is in crossing near 1k, then the same applies. You could even filter each driver for a LR4 at 1k, and go from there. If you look at your results in post #17, the red, blue and green all cross 900hz at the same spl. If you compare the distortion at 900hz, red, and blue are the same, and better than the green. Green has higher 2nd order, but is equal to red, and blue in 3rd order distortion. If you were to match the curves from say 800hz to 3k, then you could directly compare the distortions over that entire range.

[TN Allen]

"...RS52FN and friends are waiting for nice Xmax to mount them. ..."

Just curious, what do you mean by the above? I've probably overlooked a previous post and also misinterpreted the above, however, are you planning to "mount" the RS52 in a WG?

[xmax]

I will try the mini XT tomorrow against the RST, I have some somewhere and I guess they glue right on.

[itschris]

xmax, I always enjoy your posts.

I'm curious if anyone has thoughts on this combo vs the mini XT25 also in the SEOS-8. I'm currently using the XT25 with a very similar crossover to what Pete suggested in his XT25+SEOS thread. I'm planning on doing a build for a friend, and am deciding between sticking with that, or using the RST. Both look like very low distortion + flat responses, although it looks like the RST can cross lower. Input would be appreciated.

[Pete Schumacher]

don't worry i will lose my mind by the 5th page.

I regrettably assumed one could gather the gain had been monkeyed with because of the horn gain and obvious transfer function of the 6db filter @ approximately
5k via cap. In this case you were right in doubting the distortion curves of those first measurements because they were f%&*ed.

We would never blame a capacitor (or resistor) of reasonable quality of anything. Jerk face xmax might say a resistor could cause a suspicious transfer function,
but he is sleeping in. He will have his fingers all over the place soon enough.


Rs52fn and friends are waiting for nice xmax to mount them.

Zaph was onto something with his wg project mainly taking advantage of the huge mid peak created by the wg
dealing with it in the electrical domain made for a useable response whilst letting the tweet creep low in a
leisurely fashion.

Everybody knows drivers natural response needs to be man handled electronically with 37 parts to sound good.

lol!!!!