Welcome to JHS Audio. Feel free to browse through the links below.
New stuff is towards the bottom, and dates indicate updates to pages.
| Past Systems | Generally Useful Info | Other Stuff |
|---|---|---|
| Ariels | Links | Audio Items for Sale / for Free - 8/9/07 |
| 4-way horn stack | Horn Design - 2/7/06 | 150Hz Tractrix horn |
| Unity horn w/ vented sub | Wavefront Measurement in a Horn Bend | 27Hz Horn Subwoofer |
| 3-way Unity horn | FEM's of Bass horns in Various Orientations in Rooms | Fostex FE83 in a SS pot |
| Unity horn w/ dipole midbass | Some FEA's of Waves in Curved vs. Reflector Horn Bends | Unity horn - 10/28/05 |
| 5-way mono horn stack | A Budget Speaker Measurement System | MCM Horn sub (built by Tim Moorman) |
| 3-way horn stack: 27hz horn, EVM12L in 75hz horn, various 1" CD's on a 500hz tractrix |
Stored Energy Measurements | 40Hz Horn |
| JBL Sub1500 in sealed box, conical midrange w/ 4x 5" drivers, JBL2470 on 500hz tractrix, Fostex FT17H |
H and U baffle dipoles - 12/30/04 | Metal Working projects - 10/31/08 |
| Temporary apartment system: Fostex FE168E Sigmas on open baffles |
Polar maps of various horns - 7/7/05 | Horn subwoofer using two HL10's |
| 11/05 - 4/08 house system Fostex FE168E Sigmas on open baffles with JBL Sub1500 in sealed box, mains time delayed to match sub |
LeCleac'h and Conical horn performance comparison | DIY Super tweeter - 12/18/04 Starting a new die - 2/14/05 More die - 2/26/05 |
| 071208 - basement system - 4x HL10 in 30hz EBS vented box to 200hz, 40 degree conical up to 1.7kHz, Radian 475 on 500hz tractrix, DSP crossover, eq and time delay - 0-60 degrees in room, 0-60 normalized 0-60 normalized, 1kHz crossover w/ better power response Directivity index w/ 1kHz crossover System with Fostex FT17H added Directivity index with FT17H added (crossover at 10kHz still needs work, but DI comes down in the 10kHz-20kHz octave) |
Headphone measurements: Measurements are taken on a calibrated B&K HATS (head and torso simulator). Measurements are converted to diffuse field or free field equivalent responses depending on which it looks like the headphones were designed for as noted on the graphs (so a flat response is subjectively flat). Sennheiser HD580, channel difference, distortion AKG K26P, distortion Grado SR60, channel difference, distortion If you want your headphones measured, send me an email. I'll measure them for free and send you the data if you pay for shipping both ways. |
DIY 6.5" shorting ring (~1.5" diameter) - 10/3/06 |
| 081202 - Bedroom speaker - Unity horn with B&C DE25, Eminence Beta 8's on top of sealed JBL M151 and dual MCM 10" woofers vented with DSP crossover. Relative response at various angles covering the entire listening area |
. | Vacuum
bagging
an amplifier bracket - this bracket is
to hold an amplifier under the seat of my car. It's made of foam, fiberglass and carbon fiber, and conforms to the shape of the floor of my car. The amp installed |
| . | . | Rigging a table saw / building a gantry crane - 4/9/06 |
| . | . | CNC router - 7/1/09 - I designed and built this from 80/20 framing. It has a 4'x4'x6" cutting envelope. I built the router to cut this horn and others that I'm working on. Parts for the horn, profiled in a sheet of MDF. The same parts after 3D milling and assembly, but before sanding. The partially sanded LeCleac'h horn with a bass cabinet. More horn pics A battery bracket for my motorcycle, also cut on my router. |
| . | . | Hand held spindle sander - 4/13/2010 - my tool of choice for sanding horns. I designed and built this using a 300W (0.4HP) AC servo motor and parts from a Grizzly spindle sander. Speed is infinitely variable. I still need to contour the motor mount on the cnc when I have time. |
| . | . | Goto prototype system developed on request - 4/24/2010 I designed and fabricated the back loaded bass cabinets, the high frequency driver stands, the aluminum stand and wooden cradle for the mid frequency horn along with a high frequency driver alignment guide to ease setup as well as developing a 4 way passive crossover for the system. Drivers used are the SG-160, SG-370DX, SG-570, and SG-38WNS. Here are a few pictures: Bass cabinets during construction Some outdoor testing Getting ready to weld a mid horn stand The stands awaiting some polishing Finished system setup for listening Crossover is setup on top of the bass cabinets for testing Mid support stand - can be aimed vertically via the threaded rod Mid horn cradle High frequency horn stand The crossover network Alignment guide As shown, there is no finish applied. The stands were not fully polished as they were to be painted as well. |
| . | . | My Ducati 748 (non audio) Ducati single phase alternator tools for sale |
