Sennheiser HD 580

 At your risk.

https://diyaudioheaven.wordpress.com/measurements/brands-s-se/hd580-precision/

Sustain piano pedal and change of key from E minor to B minor

 At your risk.

The Mic(s) and the Piano

 At your risk.

Just a Microphone Cartridge, update

 At your risk.

The microphone cartridge mentioned in the previous before previous post is more probably a Shallin D-26A. A heavy cartridge compared to similar looking ones. It is whitish color with a black plastic protective mesh. Soldering connections are on the underside than at the side.

Passive electronic components

 At your risk. Any battery must be connected to a suitable fuse to avoid burn or fire hazard.

A wire is a highway of electrons. In a conductor such as copper at room temperature some outer electrons have enough energy to leave the atom. So we have in a cable a sea of electrons.

On direct current, a stream in one direction the electrons may move quite slowly at say 5cm per second.

Why would then a light bulb connected to a 10 meter cable light immediately by connecting the other side of the cable to a battery?

The electrons next to the bulb that will almost immediately start moving.

The almost immediate is because light needs such a little time to travel 10m.

It is the electromagnetic wave that causes the electrons to move.

So they may move in some situations slowly but their cause of movement moves very fast.

Resistors impede the flow of electric current by electrons colliding with atoms. they lose energy and this energy is converted to heat. Sometimes we use resistors to cook our food in the kitchen. 

Capacitors store electrons. They store energy in the form of electric field.

Inductors tend to keep the flow of electrons constant. Inductance behaves like a mass. If a mass is stationary it was to keep being stationary and reacts to change in it kinetic condition. If a mass is moving it reacts in trying to stopping it, accelerating it or decelerating it. Try stopping a train or a ship (large mass equivalent to large inductance). By stopping abruptly a mass for example by collision great forces are created. In a similar way a great voltage is created at the terminals of an inductor if we try to stop the current by disconnecting the circuit so we must never touch the terminals of an inductor. The spark we see is possibly by ionisation of the air by the large voltage.

 A capacitor in series will cut bass frequencies

An inductor in series will cut high frequencies.

A capacitor in parallel will cut high frequencies.

An inductor in parallel will cut bass frequencies.

Further reading:

Electronics, a Systems Approach - Neil Storey

 

Just the microphone cartridge used as a microphone

 At your risk.

Today one inexpensive moving coil cartridge was tested. Its name may be Shallin D-26B.

The voice coil DC resistance was measured about 600 ohms.

It was then given AC voltage rather than taking from it by connecting it to the headphone output of the Sony CD Walkman usually used. So it was used as headphones. The sound quality was very nice. There was bass and white balanced bass, mid and high frequency content.

Compared to the Sennheiser HD 580, the HD 580 had more extended bass, treble, and less mid range but the sound quality from the mic cartridge used as headphones was possibly the closest to the HD 580 from many headphones expensive or inexpensive lying around the Pleiades lab.

Then it was used as microphone.

Signal path:

singing male voice - indoors (bedrrom0 or outdoors (balcony) - Shallin MC cartridge without a mic housing ie on its own at 24in from singer's nose - SONY TC-D5 PRO II - Sennheiser HD 580

The sound quality so surprisingly nice, without the boxy sound associated with many mics inside their housing. 

The cartridge on its own responds somewhat close to figure of eight.

One of the reasons for the natural sound could be the fact that there are no obstacles close to it like a microphone housing distorting the sound field.

Compared to the Shure Unidyne B Mexico, the Shure had more extended high frequency but the single mic cartridge sounded more warm or natural. How would Unidyne B sound without the mic housing?

How would 2 Shallin cartridges sound each back side placed at each ear for (3D) binaural recording.

How would 2 sound as stereo headphones?

\

Would it be possible to create a stereo mic or headphones using just 2 such cartridges for both which could be rotated so that at playback diaphragm faces the ear, at recording diaphragm faces in the opposite direction.

There was handling noise when holding the cartridge by hand but the problem was much improved by suspending the cartridge by the 2 thin wires soldered to it.

How would 2 of them sound at stereo, at 90 degrees to each other and very close?

Why is it so?

 At your risk.