Re: New DIY Mid High
Thanks Art,
As part of my research I did have a look at your design, it looks great but I wanted something that looked a little more conventional for the work I do. If the size was not an issue I would have built a smaller version of Danley’s SH96HO optimised to work above 100Hz.
I have A/B the 4594 and the 4594 HE with some Eighteen Sound drivers - NSD1480N, ND1480 and RCF’s new ND850.
The BMS sounded much better; my ears told me exactly what Jack described above.
http://www.eighteensound.it/PRODUCTS/Products/CatID/3/ProdID=151#.VLg2a2kbrq4
http://www.rcf.it/en_US/products/precision-transducers/neodymium-compression-drivers/nd850
The distortion type, and the frequency where it occurs is the reason – the third harmonic is low in the critical mid band.
I used the HE version in this project. I don’t have any distortion figures for this driver but it has shorting rings and should have noticeably lower distortion.
Being a two way driver, the acoustic output is the sum of a 150 watt HF and an 80 watt VHF driver. On a single frequency sin wave test there is no significant advantage compared to a normal driver, but on a complex wave form there is a big advantage. Being able to coherently sum the outputs you can achieve much higher peak SPL’s. You can also design the VHF to be much more efficient, in this case something like 10 - 12dB at 10kHz compared to a DH1A.
Anyway … you need to get yourself a Lake (or similar) and some 4594HE’s to play with … love to see what you could come up with 
~~:smile:
