HiFi-Do E-mail Newsletter

It is getting warm.
The cherry tree also broke up in the twinkling of an eye, and got warm suddenly.
Listening to the Audio in your room or changing the speaker units・・・?

To use easy about a speaker unit driver, we are checking the following.
Urethane edge, pressure level check, sound distortion check,
Measurement in impedance meter, the state of a damper.

The state of urethane edge: The portion of the deep pool of some speaker units have made by sponge called urethane.
It is mostly used to JBL or TANNOY, and although based on the environment, it will deteriorate in about 6〜8 years.
When we look, it is O.K. But if touch, it collapses!
Don't you have such an experience?

When you touch lightly and it is damp or is inelastic,
You need special attention.

The expense of edge exchange is \36,750 (including tax and pair) at JBL.
TANNOY \52,500 (including tax and pair).
Since using the deteriorated it causes disconnection of a voice coil, we recommend your early exchange.

Sound pressure level check: We reproduced two units by the monophonic recording and we test whether there is any deviation.
Moreover, we do the test of distortion simultaneously.
We test changing sound pressure from rectangle waves,
To the usual reproduction using CD.
Such as a sweep signal, and each frequency reproduction, Piano, Vocal, etc.

When garbage enters in a voice coil, or it is not used for a long time and
Rust is inside,
It is distorted well.
Of course, overhaul is possible, please ask.

Measurement in impedance meter: If we actually measured the impedance by the unit, it is different.
Although there is no any problem,
Aren't you worried about it when right-and-left is deferent, are you?
Then, I made it to measure every one by one and write it.

The state of a damper:
If you used for a long time, corn paper may hang down.
In that case, the root of corn paper and the portion of damper (Jaballah-like disk) is rising, or it has dented.
Although it is a narrow part,
I took the photograph, please make it reference.
※State - the normal photograph is left. Right is depressed.

I will also measure a past arrival at any time, and is carried.
Please ask, if there is a worrisome point. I am waiting.

Ohsu head shop Kazuyoshi Sone

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