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SoundFirst SF101a Precision Microphone



SoundFirst SF101a case

The SoundFirst SF101a is a high stability precision omnidirectional phantom powered measurement or instrument microphone made in Colorado USA. Unlike most microphones in its price range it uses a real precision measurement microphone capsule by ACO with a titanium diaphragm.

While primarily designed for precision measurement work, the SF101a also makes a fabulous recording microphone with flat response, low noise, and a high maximum SPL. Use it anywhere you would use a top quality omni mic. Matched pairs or larger sets are available by special order.

Most microphones sold for measurement use in the under $1500 price range have plastic diaphragms. The combination of the diaphragm materials and the construction techniques used result in sensitivity to temperature extremes. Worse, a single exposure to high temperatures such as found in a car in summer, can result in significant permanent changes in response. Some manufacturers attempt to minimise these effects by "pre-aging" the microphone capsules before final assembly and calibration, but this does not remove the inherant instability of these capsules.

The SF101a instead takes the approach used in all the best and most expensive measurement microphones in the world, and uses a real precision measurement microphone capsule which was designed from the ground up for extreme stability under environmental extremes. These same capsules have been exposed to the weather on a mountain top for years and still meet their new specifications. Their sensitivity changes only 0.01 dB per degree C over the entire temperature range from -10 to +50 degrees C (14 to 122 degrees F). Exposure to 55 degrees C (131 degrees F) and 95% humidity (non condensing) changes the sensitivity less than 0.1 dB. Long term stability at 20 degrees C (68 degrees F) is greater than 250 years for a 1 dB change. SF101a typical noise is 13 dB SPL A-wtd, sensitivity is -36 dBV per Pascal, and maximum SPL is 138 dB for a 125 dB dynamic range.

The SF101a has a capsule diameter of 13.2 mm (0.520") so it fits IEC Standard calibrators for nominal 1/2" microphones. Few measurement microphones sold in its price range are the standard diameter making it difficult to calibrate them.

To protect your investment in this precision instrument, it comes packed in a waterproof case designed by Otter Box. This rugged case is filled with foam to securely hold your microphone and protect it from most normal conditions. This is a far more rugged and expensive case than other measurement microphones are supplied with, but I felt it was worth it to protect this high class microphone.

Of course the SF101a is supplied with an Individual Frequency Response Curve (IFRC) on the complete microphone, calibration data, and the original ACO factory response curve on the capsule. Each SF101a microphone comes with a stand adapter, IFRC, and a waterproof case designed by Otter Box.

Matched sets of SF101a are available by special order for those who need multiple microphones for use with Systune, Smaart, SIM or other multi-channel measurement systems.

The SF111a is a special order version of this mic with a Type 1 capsule. The sensitivity is about 4 dB higher and the noise floor is about 3 dB lower. The SF111a is supplied with an Individual Frequency Response Curve (IFRC) on the complete microphone, calibration data, and the original factory response curve on the capsule. Each SF111a microphone comes with a stand adapter, IFRC, and a waterproof case designed by Otter Box.

I am now stocking the ACO MATT-20 attenuators that fit between the capsule and the preamp body and reduce the sensitivity by 20 dB. They will work with any industry standard 1/2" mic capsule, and allow measurements to be made of high SPLs. Other attenuations are available on special order. The MATT-20 cost $195.00 plus $10.00 shipping.

The SF101a with stand adapter, IFRC, and a waterproof case designed by Otter Box is $890.00 plus shipping. The SF111a with stand adapter, IFRC, and a waterproof case designed by Otter Box is $1415.00 plus shipping. Ground shipping in the 48 states is $20.00 for one mic or $30.00 for two.

Purchase SF101a measurement microphone using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)

Purchase SF111a measurement microphone using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)

Purchase ACO MATT-20 attenuator using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)


DPA 4007 Studio Microphone



DPA 4007

The DPA 4007 was derived from Bruel & Kjaer's line of world class measurement microphones. It was made in Denmark. The capsule was a slightly smaller than standard version of a Bruel & Kjaer measurement capsule with a polymer protected nickel diaphragm.

It was designed to be able to take extreme levels of up to 155 dB SPL peak while maintaining a self noise of only 24 dB A weighted. The response was uniform to 40 kHz. Because of the heritage and excellent performance of this microphone it was popular as a phantom powered measurement microphone in addition to its intended use as a studio microphone.

Since the 4007 used a measurement microphone type capsule it had great environmental stability. The sensitivity changes only 0.02 dB per degree C.

The 4007 had a capsule diameter of 12 mm and required a special adapter to fit calibrators. It came packed in a nice hard case with stand adapter and windscreen.

Of course the 4007 was supplied with a factory calibration chart with response curve. Each 4007 microphone came with a stand adapter, windscreen, calibration chart, and hard case. Unfortunately DPA discontinued the original version of this microphone as shown in the photo.


Josephson C550H Test Microphone



Josephson C550H

The Josephson C550H is a precision omnidirectional phantom powered measurement microphone made in the USA. The diaphragm has been specially aged for stability. This is the mic that many manufacturers copied the body from, but not the performance.

These mics are all matched for sensitivity at the factory, and all C550H will have the same sensitivity. They are individually serial numbered and have a calibration sticker on them.

The C550H has a capsule diameter of 13.2 mm (0.520") so it fits IEC Standard calibrators for nominal 1/2" microphones. Few measurement microphones sold in its price range are the standard diameter making it difficult to calibrate them.

You can download the manufacturer's datasheet here.

Josephson offers a 5 year warranty on all their microphones.

The C550H comes in a zipper bag, and is supplied with a shock mount in a foam lined box for $449.00 plus shipping. The C550H can be ordered with an Individual Frequency Response Curve (IFRC) for $499.00 plus shipping. Ground shipping in the 48 states is $16.00 for one mic or $24.00 for two.

OUT OF STOCK waiting for more from Josephson.


Audix TM1 Test Microphone



Audix TM1 with optional windscreen

The Audix TM1 is a precision omnidirectional phantom powered measurement microphone. It is the least expensive test & measurement mic with acceptable performance I have found.

The TM1 has a capsule diameter of 8 mm. The optional CA4231 calibrator adaptor allows it to be calibrated using an industry standard calibrator that accepts nominal 1/2" microphones.

The optional unique screw on windscreen is the WS-TM1.

This microphone can also be purchased in a kit with the CA4231, WS-TM1, stand mount, zipper case, and a calibration CD, as the TM-1PLUS.

You can download the manufacturer's datasheet here.

Audix offers a 3 year warranty on this microphone.

The TM1 comes in a zipper bag, and is supplied with a stand mount. Audix's Minimum Advertised Price (MAP) for the TM1 is $299, and for the TM-1PLUS is $399. MAP for the CA4231 is $35 and for the WS-TM1 is $29.95. To see my price put the item into the shopping cart (you can always remove it). Ground shipping in the 48 states is $16.00 for one mic or $24.00 for two. Ground shipping in the 48 states is $6.00 for one adapter or windscreen or $9.00 for two.

Purchase TM-1PLUS measurement microphone using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)

Purchase TM1 measurement microphone using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)

Purchase Audix WS-TM1 windscreen using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)

Purchase Audix CA4231 calibrator adapter using PayPal. (PayPal Confirmed shipping address in 48 continental USA states only.)


Superlux ECM-999


I am no longer able to obtain Superlux ECM-999 with the performance they had for many years. As a result I am no longer selling these mics.


Please see the other fine test mics I sell above.


Email me at Sales@AudioToolbox.US. I accept all major credit cards and eChecks through PayPal, or you may pay by Money Order sent to the address below.

Mailing address:
Ray A. Rayburn
1716 Main St Ste A #300
Longmont, CO 80501-7413
USA

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Last Edited 7/2/2015

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