My Modified SASS Microphones

 


 

Modified SASS Microphone using Sennheiser MKH-20's

Front view, note offset of mics so as to clear each other in back. One mic mounted close to original mic position, other same distance from bottom. Note the adapted handle (from a Sennheiser shockmount)

View from top. Angle between mics is 75 degrees, angle between front faces is 110 degrees, making the view of the mic system 250 degrees max.

View from back. Mics are held in by two O-Rings, one just behind front also acts as a acoustic seal, other is near back end of holder.

Closeups, note that mic is positioned with housing (and diaphragm) flush with front face.


 

Modified SASS Microphone using Sennheiser MKH-110's

View from center front. MKH-110's mounted in machined brown delrin supports behind front face which extend behind back plate. O-ring seal behind front face in groove in support block, 2nd O-ring near back end of block provides additional support. Mics located in approximately the same position as original mics with diaphragm even with front face.

View from top. Angle between mics is 75 degrees, angle between front faces is 110 degrees, making the view of the mic system 250 degrees max. Note the proper positioning of the mic, part way down the side slots, location of diaphragm.

Rear view. Rear of brown delrin support blocks. Battery compartment from a Shure portable preamp (bought as parts). 5 pin Neutric connector. Original cable connectors modified by removing the internal cable clamp to shorten them, and machining plastic end caps out of UHMW colored plastic, then machining out locking ring to fit. Hot glue used for strain relief. Red colored on dot also UHMW. Amber window to power on LED is Polysulfone, a high temperature tolerant plastic. Back plate milled from 3/16" ABS plastic ripple surface sheet.

Internal works removed from housing. Since reworked slightly for one piece support blocks. The two gray trimpots adjust voltage for mic power, blue trimpot adjusts brightness of power indicator LED. Perf board for electrical is hot glued to battery box. Support blocks not shown, and rear plate bored to larger size to slip support blocks through. Mics will only go in from front due to the step in their diameter. Scan of Sennheiser's powering circuit diagram for MKH-110


 

Sound samples

Please note that this is my setups and may not represent the full potential of the SASS design. The SASS-P is the current Crown model unmodified.

A quiet evening, by ear faint insect sounds. Samples from the original SASS-P , the SASS/MKH-110 , and a SASS/MKH-20 . Also a comparison of all three by sonogram. SASS_Sono-1.jpg Note while these were recorded one after another, they are not of the exact same sounds. All sounds in these samples were in the environment, including the hum which is most evident in the MKH-110 version, less so in the MKH-20 version, and not audible in the P version, it's a nearby power transformer on a pole about 100 yards away. Recorded with the HHb Portadisc & Sound Devices MP2 pre. High pass filter on in both pre and Portadisc.

Rain: SASS-P : SASS/MKH-110 : SASS/MKH-20 : Also a comparison of all three by sonogram. SASS_Sono-2.jpg The rumble is a gas turbine power plant, several miles away. Recorded directly with the HHb Portadisc with 175 hz high pass filter on.

Thunderstorm, cloud lightning. SASS/MKH-110 : SASS/MKH-20 HHb Portadisc/Sound Devices MP2 pre. Wind covers on, recorded from car window. No high pass filtering, a little clipping is evident. These are each a single bolt (not the same bolt).

More Sound Samples Here


Modified SASS Microphone using Audio Technica AT3032

Using borrowed AT3032's with shims for the housing for a SASS/MKH20

Sound Samples


To see how I make a modified SASS


June 10, 2006 - wwknapp@mindspring.com