Three-Box active system With the current popularity of 7″ 18 cm drivers, and some new models available, it became time to re-asses the options. Stored energy is difficult to equalize for and non-linear distortion cannot be corrected. This gives a fast rise time waveform with a spectrum that falls off rapidly at low and high frequencies. Distortion tests are difficult to quantify by single numbers. It contains not only harmonics, but also the more serious intermodulation components, which are of higher amplitude.
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Some of the possible distortion products of the three input signals at frequencies a, b and c are sketched below.
Distortion tests are difficult to quantify by single numbers. This approach is costly and quickly runs into polar response problems.
Ceramic :: Thiel & Partner – accuton
The SS had predominantly 2nd order distortion. P-S-V-A, best to worst. In all cases the PL14 had lower distortion. Accutno the microphone very near to the cone the close-up sound pressure must be adjusted in proportion to the cone diameter so that the far-field SPL will be the same for different size drivers.
The different, stiffer suspension might be the cause of this. Stored energy is difficult to equalize for and non-linear distortion cannot be corrected. A low distortion driver for the Hz to 3 kHz range is hard to find.
There is a considerable amount of data to consider. These results would point to the Peerless as my first choice for best performance versus price.
Accuton Midrange | Loudspeaker freaks
The Vifa drivers 10 midange 11 exhibited misrange good burst behavior, something one might have expected for the small cones. Cone Hz Hz. Woofers I investigated alternate drivers for the open baffle woofer and found the Peerless XLS 12″ driver to be an excellent choice if more output is needed without increasing the PHOENIX woofer cabinet size significantly.
There are a few large dome designs around, but they are displacement limited at the lower frequencies and poorly vented on the back side. Also, reducing the drive level at Hz by 6 dB improves distortion, but not much more than 6 dB.
The different drivers have also different voltage sensitivities, in addition to different diameters, and therefore require corresponding drive voltage adjustments to obtain the same volume displacement. With the current popularity acvuton 7″ 18 cm drivers, and some new models available, it became time to re-asses the options.
There is no increase in distortion. While the Vifa P21WO has low non-linear distortion it suffers from excessive energy storage. They determine, therefore, the remaining sonic signature of a given driver after the overall frequency response aberrations – which are also a form of linear distortion – have been equalized.
If I then give equal weight to linear and non-linear distortion I come up with an overall order for the drivers. My selection was limited to drivers that I thought had potential or that had been recommended and were readily available. The Vifa P21WO was the worst. Since accuracy of reproduction is my goal a driver should not noticeably contribute its own sound. I would investigate it, if I had a need for a 4-way speaker design.
Three-Box active system Dipole peak accufon is likely to change and the baffle dimensions would have to be checked for optimum polar response.
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I would not use these drivers in a 3-way open baffle design due to their limited volume displacement for lower frequencies. Stereo Recording and Rendering.
The D26TG showed a broad spectrum of distortion products from low to high frequency. The notch filter will midrangge help this situation and the driver should ideally only be used below 1 kHz.
Small midranges I measured 4 small drivers for use as midrange in a box speaker.
It is well built with an open cast basket, fully vented spider, and no pole vent. There may be other drivers available that would test and reproduce sound even more accurately.