The Xaudia Blog

17-05-2014

Reslo Dynamic microphones

Reslo are of course best known for their ribbon microphones, particularly the RV and RV models, However, it should not be forgotten that over the decades they made many dynamic microphones, and even some condensers too.

Reslo VMC with base station

The earliest Reslo dynamics seem to be the VMC and VMC2, with the initals standing for Velocity Moving Coil. These had a big heavy permanent magnet and a paper diaphragm, and are really rather lo-fi devices. These two models are more or less the same inside, although the VMC was hard-wired, and the VMC2 had a new grill and an output plug.

Reslo VMC2, with output connector.

In the late 1960s Reslo made a range of more modern light hand-held dynamic mics. The UD1 used a Japanese-made capsule which sounds rather good, of comparable quality to the Shure mics of the era. I have seen transformerless 200 ohm models, and also a dual output 30 & 600 ohm version with a transformer in the body to convert the impedance.

Reslo UD1 microphones

The UD1 was apparently used by Bob Dylan at the 1969 Isle of Wight festival!  Here is an advertisement scan from the Reslosound blogspot….

The advertising also mentions a high impedance model, although I haven’t come across one yet.

Some of the UD1 mics were hard-wired to the cable, and it was also supplied with a Reslo connector, and later a 3-pin din plug, with different impedance options available through the different pins. They are wired like this, with one side of the capsule and transformer primary wired to the output socket.

In addition to the UD1, there was a short stubby version that used the same components, and would often have been used with a gooseneck adapter. Pictured below is also a smaller dynamic mic for use with a tie clip.

These models appear to have been replaced in the 1970s by the Reslo Superstar range, which were essentially the UD1 with an updated body and grill. The Superstar was supplied with a DIN plug – I have converted this one to XLR.

Reslo Superstar 80 dynamic mic.

SJT, May 2014

29-04-2014

Film Industries M5 dynamic microphone

Film Industries Ltd. are perhaps best known for their M8 ribbon microphone, but what about models M1 to M7? Well, here is 14.286 % of the answer: the M5 moving coil microphone.

Film Industries M5 moving coil microphone

This model was likely to be a competitor to the Reslosound VMC, and like the Reslo, the M5 features a paper diaphragm driving a moving coil in a magnetic field. The output is wired to a pair of screw terminals, for easy wiring without the need for a custom connector. It does not have a separate ground connection.

The large black rubber cylinder at the base is supposed to give some vibration damping, although perhaps not enough to make a major difference.

Although a 30 ohm mic, this one at least has a strong output, due to the large strong magnets.

And here’s a somewhat wiggly frequency sweep of the mic:

21-04-2014

Reslo Beeb Commando!

Here is a custom edition of our popular ‘Beeb’ modified Reslo ribbon mic. This is the first, and so far the only one we have made in these colours.

Like all of our ‘Beeb’ mics,  this features an upgraded 300 ohm output transformer, new ribbon and XLR socket. This special edition as well as a switchable high pass filter inductor to balance the proximity effect when used close to sources.

The custom camouflage colours makes it suitable for undercover operations, and even better for guitars and drums!

16-04-2014

MOTM: Reslo NC-RB Lip microphone

Our Microphone of the Month for April is this rare oddball from Reslosound: the NC-RB.

This was Reslo’s attempt at a commentator’s lip microphone, and appears to be cobbled together from spare RB parts. The upper body and head are from an RB, but the head is rotated through 90 degrees and screwed to another chopped-down head.  The lower body-stroke-handle is a straight aluminium tube with a switch which terminates in a normal Reslo output socket.

Inside the head is a rotated  RB-style motor.  The magnets face the speaker, to provide some pop protection for the ribbon at the rear.

Behind the ribbon I found this metal baffle, which should control the pickup pattern and tweak the frequency response. There is also fibre glass and felt wadding for more protection.

Overall it is a strange little mic. The ribbon runs horizontally, which is generally considered a bad plan as, if it sags, it will droop into the metal pole pieces. They must have been a way of producing a lip mic without the expense of re-tooling for a completely new design. I have only ever seen this one, although I know of a customer who owns another.

What does NC stand for? “Not a Coles”, perhaps?

02-03-2014

B&O BM5 and BM6 magnet upgrades

A while ago, I blogged about some magnet upgrades for the B&O BM3 and BM4 ribbon mics that greatly improve the signal-to-noise performance of the mics. We have similar magnet upgrades for the later BM5 and BM6 models.

Dirk at V76 Studios in Hamburg was kind enough to share some sound files of his BM5 stereo set, recorded before and after we fitted new magnets and ribbons. Here they are…

‘Blackbird’ recorded with his stock BM5, before the modifications


Download file

‘Blackbird’ recorded with the upgraded BM5, with new magnets and ribbons

These are Dirk’s impressions of his recordings…

“The difference is amazing. The mic sounds awesome now. It’s about 10-12 db louder (needing only 52 db for the front for finger picking now) and it has got much more treble and presence. Still it sounds smooth and wonderful rich, without losing the transients. This mic is killer for acoustic guitar now, and also as a room mic. I also compared it to my modified RB500 Mics (with cinemag 9888 Transformers) and the BM5 now has 6 db more output and is sounding so much better. Also the Beyer M130 doesn’t match it by far, IMHO.

“Both were recorded with the BM5 (60 degree angle pointing towards neck and bridge) into a TRP Ribbon Mic Pre direct into RME Converter into my DAW. No lowcut. The older recording would have been 10-12 db lower with the same TRP-Gain. For a better comparison, I choose to normalize both files. Still the new one sounds louder, brighter and more detailed. The noise floor of the older recording is clearly audible, and unnoticable with the new one – due to the 12 db more output of the mic.”

Update 21 Feb 2015.
Here are some comments from Andy at Superfly Studios in Nottinghamshire, UK, about his B&O BM5 with magnet upgrades and new ribbons.

“I’m so happy with these microphones. They have been absolutely fab to use over the past few days.
First session in was an acoustic folk duo, I used the B&O BM5 on one of the guitars and it just sat straight into the mix and sounded great. Picked up all the detail of his picking and sounded nice and rounded on the full-on sections. Just the right amount of highs for my taste as well, I normally use a 414 for acoustic and cut some of the top end, but I’ve got a new favourite now.

Also used the B&O for the drums today and it sounded great in the room, I love using room mics on drums and had the beeb reslo’s as a spaced pair about 8 ft away (10ft apart). Seems to always do the trick in the live room and the B&O just in front of the kit at waist hight. Sounded fantastic lovely sustain to the cymbals and picked up the natural ambience of the room.”

18-02-2014

MOTM: Gaumont-Kalee Type 1492 ribbon mic

This month’s MOTM is the Gaumont-Kalee model 1492,

….made by British Acoustic Films Ltd. 
Both GB Kalee Ltd. and BAF Ltd. were subsidiaries of the parent Rank Organisation, which owned various other companies associated with the film industry, including Odeon Cinemas.
Back to the microphone – this specimen comes in a nice wooden box, and although is painted in a rather drab shade of mustard yellow, there is something pleasing about its proportions and utilitarian design. The grill has a coarse outer later and a very fine layer of woven wire inside.  It is designed to sit on a boom mount, like this (nicer looking) gold-painted example from Pinewood studios. 
Sadly we don’t have the mount, but as this shares a connector with the Reslosound mics, we can use a Reslo stand mount for it. None of the other parts are common to the Reslos, so they must have just sourced the connector from them.

Inside, the mic is a fairly conventional figure-8 ribbon mic, but has added baffles both sides of the ribbon, and thick wires run from the top ribbon clamp, giving some blast protection along the way.

The ribbon motor uses tapered triangular pole pieces, which compensate for the decrease in magnetic field with increasing distance away from the two block magents, and ensure a more even magnetism along the length of the ribbon.

And of course there is a suitable transformer in the base to convert to a sensible impedance – in this case 50 ohms. The mic sounds rather nice, rich and dark close up – it may make a vocal session very soon! 
08-02-2014

Lustraphone Lustrette – dynamic mic

Here is a little Lustrette LD/61 – a charming little egg-shaped desk microphone by Lustraphone.

I picked this one up with a couple of crystal microphones, and for a long time I had wrongly assumed this to be a crystal too. But when I opened it up I found a dynamic capsule and step-up transformer. I should have guessed from the model number – ‘D’ usually means dynamic.  In fact it features in a Lustraphone product catalogue that I posted earlier – so I have no excuses!


Lustraphone LD/61 inside

The mic comes in a stylish box, with a picture of the mic, so you know what you’re getting.

The dynamic element looks similar to the one found in the more common C51 model, and it is possibly the same mic in a different package.

03-02-2014

…I’m gonna take my Ribbon to the United Nations….

Back in 1954, Bang and Olufsen BM3 ribbon mics were installed in the United Nations building in New York . The mics were chosen for their lack of feedback, and are clearly visible in these video clips of  Lester Pearson speaking about the Suez crisis.

Lester Pearson speaks into two B&O mics at the UN

Pearson later won the Nobel Peace prize for his work, and became president of Canada. Perhaps those little Danish microphones played a small part!

B&O were justifiably proud of their mics being chosen for the UN – here is a document from the time…

And a translation from the Danish….

“As we previously mentioned to you, we have received a message from our US representative, Fenton in NY, that the UN uses our BM3 microphones throughout the UN building in NY. They chose the B&O mic and an American mic because only they, out of several hundred different manufacturer products that were tested, did not give rise to any acoustic feedback in the several hundred loudspeakers that are mounted in the ceiling of the UN general assembly building. Our mic also had an advantage over the US product as it didn’t hide the speaker’s face, which is important with regards to film and TV reporting. The microphones have been in use in the UN since 1st October this year. The newspaper INFORMATION recently had an article with a picture that depicted the Canadian foreign minister , Lester B. Pearson , at the podium in front of B&O microphones when he presented his suggestion for involvement in Egypt. Via our advertising bureau we managed to send out a press release under the title “Danish microphones at the UN podium”, and a whole selection of magazines included the picture and advertisement. We have attached the picture for your information – Next time you see the program AKTUELT in TV with recordings from the UN building, take note of our microphones, they are clearly visible.

“Our American representative has also undertaken an investigation that shows B&O micophones are used at, amongst others:
[Mercury, ABC and Decca]
“We have large orders from Fenton conmpany for microphones and pick-up units, and the advertising that Fenton performs in the American technical journals has the effect that we receive requests from other countries. This has resulted in that we have recently sent 10 samples to Australia and samples to Hong Kong, and other countries are also showing interest.
“Likewise we have significant orders for AC motors from Norway, where we compete with German and English manufacturers, and samples of this product has been sent to other countries.


30th Nov. 1956