Drive voltages are kept low to represent typical operating conditions, with the reference at 5. For any new design I would seriously consider the Seas T25CF tweeter, though I am not sure how directly the small improvements in measurement data translate into audible benefits. P-S-V-A, best to worst. I would encourage you to use this test method and investigate for yourself, if you need a driver of this size. If set to Hz its spectrum consists of a Hz carrier and sidebands at Hz and Hz with 6 dB lower amplitudes.

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The different, stiffer suspension might be the cause of this. Non-linear 2nd order distortion products of the XT25 were by far the worst of the three, 3rd order products were ok and higher order products were very low.

Ceramic :: Thiel & Partner – accuton

It should be apparent by now why stored energy and non-linear distortion are such important driver parameters. The test microphone is at the center of the cone diameter and touches the plane which would be formed, if a flat sheet of paper were placed over the front of acduton driver. One way is to take the average of the two sets of non-linear distortion rankings and of the three sets of linear distortion.

Since afcuton of reproduction is my goal a driver should not noticeably contribute its own sound.

A four cycle burst of this signal is also very useful for qualitative in-room woofer response analysis. While the Vifa P21WO has low non-linear distortion it suffers from excessive energy storage. It makes a pinging sound. This approach is costly and quickly runs into polar response problems. This will be a relative comparison of drivers. I did not include drivers with smaller diameter, because of the large volume displacement needed for a dipole. There may be other drivers available that would test and reproduce sound even more accurately.

It is well built with an open cast basket, fully vented spider, and no pole vent.

I would not use these drivers in a 3-way open baffle design due to their limited volume displacement for lower frequencies.

Since these tests were done Seas introduced the W22EX The Vifa P21WO was the worst. Compared to a Hz crossover this would reduce the volume displacement required from the midrange and thereby reduce its non-linear distortion.

My selection was limited to drivers that I thought had potential or that had been recommended and were readily available. To avoid the midrange cone breakup region one would need to go 4-way with one or two 50 mm piston drivers accutoh for the Hz to Hz range. Dipole peak equalization is likely to change and the baffle dimensions would have to be checked for optimum polar response.

There is a considerable amount of data to consider.


This driver is my first choice for any new open baffle speaker design. The tests also confirmed the respectable performance of the Vifa tweeter compared to much more expensive models. Measurements are taken with the driver un-baffled and resting on its magnet, but without restricting air midranbe from any pole vent.

The drivers are tested at Hz, Hz, and Hz in their cone breakup regions. The high end of the midrange has to deal with the deterioration of the cone’s piston behavior. The large resonance peak at 5 kHz requires a notch circuit. There midrannge many other drivers on the market and if you know of one that might stand out positively in the tests below, then please let me know, or wccuton yet – send me a sample.

I observe how rapidly the driver output decays and stored energy is released.

The Peerless HDS is the midgange leader in the performance versus price category for this group. If I then give equal weight to linear and non-linear distortion I come up with an overall order for the drivers.

Accuton Midrange | Loudspeaker freaks

These results would point to the Peerless as my first choice for best performance versus price. For large signal measurements s ee also: This feature is needed to keep the frequency response up. In all cases the PL14 had lower distortion.