Discontinued microphone models

Made a range of mics in the late 50's and into the 70ís, these were fairly cheap and were thus often seen in amateur studios in the UK, more info on 2 common models to be found here. Most ACOS made or branded microphones are communication quality products that utilise cheap dynamic or crystal inserts that are of a limited interest today, one possible exception is the Lustraphone VR64 ribbon microphone, this model has a figure of eight pattern that unlike most modern units is fixed rather than switchable so the VR64 is only usable for certain recording applications unless you acoustically shield the back side. It was at the time of introduction more of a semi-professional unit and as such has a fixed cable that terminates in a balanced XLR male connector rather than a connector at the body itself, the wire used is cheap and if you acquire one of these you might want to look at upgrading the cable. The VR64 is sought after by certain vintage ribbon mic aficionados as a good sounding unit but as with all vintage equipment your mileage might vary, some of these old ribbon mics are overrated.

Acoustic Solutions

A Low budget omnidirectional dynamic handheld microphone introduced by Acoustic Solutions in 2001 as the Home Mix MC-1 and sold as such when bundled but when offered individually then sold in blue livery as the Acoustic Solutions ProMIC and in silver livery as the Home Mix ProMIC. Actually a Chinese OEM design that was also available from a number of other sources and as such is nothing worth seeking out even if it is a perfectly functional unit as it stands.

The technical specifications of the Acoustic Solutions/Home Mix ProMIC/MC-1 are: Type: Handheld. Body material: Unspecified cast metal. Transducer/Inset type: Dynamic. On/Off switch: Yes. Output impedance: 600 ohms. Output connector: Cable terminated in a 6.35mm jack. Size: 5.5 x 5.5 x 21.5 cm (Width x Height x Depth). Weight: 1 kg.

Ribbon mics from the 50's, desktop standing units that were originally intended for voice applications, but have a characteristic "sound" that may suit other material.

Curtis Technology

The company introduced the AL-1 in 1995, it is a valve based condenser microphone built around a 12AU7 valve that has some unusual characteristics. It was originally designed as a high end mic specifically intended for the recording of drum overheads and utilises an uncommon polar pattern that the company described as an elongated cardioid. It was sold not just to drum recordists but also marketed as a generic ambience microphone or for any application that did not require close miking.

Although the AL-1 was supposedly available as a single microphone it was invariably sold as a stereo kit with 2 microphones and a power supply and in 1999 the company introduced the AL-2 which for all intents and purposes appears to be simply a stereo pair of AL-1ís and shares the exact same specifications, the AL-1 was discontinued in 2001.

Manufacturers specifications :
Diaphragm : Gold free condenser 3.2cm (2.2cm exposed)
Nominal impedance: 600 Ohms.
Frequency response : 20hz - 30khz.
Maximum SPL : 125dB.
Output: Balanced, transformer coupled. (Transformer-less unbalanced version available via a special order).
RRP : USD 2495 in 1997, USD 2995 in 1999 (AL-1 Stereo system). USD 3495 in 2004 (AL-2 Stereo system)

The FC1200 are quite a bit sought after here in the UK, they were actually made by Calrec.

Home Mix

For information on the Home Mix MC-1 and ProMIC see Acoustic Solutions ProMIC. The only other microphone sold under that brand was the RM-1 wireless mic system, a budget handheld omni microphone with a analogue desktop receiver that works on the VHF band.

The technical specifications of the Home Mix RM-1 are: Type: Handheld wireless system. Body material: Unspecified cast metal. Transducer/Inset type: Dynamic. On/Off switch: Yes. Indicators: Battery low on mic, signal & power on base. Output impedance: 600 ohms. Output connector: 6.35mm jack socket. Radio system: Analogue VHF. Usable range: Approximately 20m. Size: 23.2 x 4 x 9 cm (Width x Height x Depth). Weight: 1 kg. Power requirements: 9v PP3 battery for mic, 9v DC wall wart for base.

Had a range of recording microphones primarily intended for the bobbyist and semi-pro markets, especially interesting are the omni models from the latter half of the 70's that have some B&K like characteristics, this page here has some further info.

Peavey Electronics
The company has from time to time offered microphones, in the mid eighties it had a line of hand held mics called the Celebrity series that were for all intents and purposes run of the mill with the possible exception of the CD-30 and HD-40 that featured better than usual screening and hum rejection.

Had a large range of dynamic microphones if you are looking at these second hand note that they are more designed with sound reinforcement than recording in mind, was also a manufacturer of dynamic insets etc...

Bose PM-1

Budget pencil type cardioid electret microphone sold by Bose Corp, introduced alongside the company's Bose AW-1 Music system/portable PA system in 1986 and frequently sold bundled with it. Since AW-1 did not feature microphone inputs the PM-1 does unusually enough output line level signals rather than microphone level and the microphone is terminated with 2x male cinch plugs to plug into the aux output of the AW-1 or the line level input of any amplifier or music system.

Note that despite the presence of 2 cinch outputs the microphone is a monophonic model and not stereo, it is simply put into both channels since the system it is intended for did not feature a mono button. Otherwise this is a fairly run of the mill pencil electret with a switchable roll-off filter and an on/off switch and it came with a Neoprene foam windshield and a simple desktop stand. Note that the company called it a Power Microphone or Acoustic Wave power microphone.

Quite literally the only thing interesting about this microphone is its built in amplifier that allows it to be used with any system that had line level inputs and while there are similar products available they are by no means as common a find as the PM-1 was, otherwise it is just an overpriced but bog standard pencil electret.

The PM-1 went out of production in 2004 but Bose was still selling old stocks as late as 2006.

Resources : User manual on Bose homepage

Manufacturers specifications :
Element: Electret Condesnser
Directional Characteristics: Cardioid
Frequency Range: 80~15,000 Hz +/-5dB
Impedance: 10k Ohms (@ 1,000 Hz)
Equivalent noise level: Less than 40dBA SPL
Sensitivity: 94dB @ 1 kHz produce 80mV
Max SPL before clipping: 105dB
Rolloff: Switchable 6dB below 200Hz
Power requirements: 2x AA batteries
Estimated battery life, 600 hours minimum
Plugs: 2x cinch (RCA)
Mic Dimensions L◊D: 250 ◊ 30 mm
Weight Including Cable: 240g

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The site was last compiled on Sun Nov 10 2013 at 9:15:00am