Saturday, February 28, 2009

Monday, February 23, 2009

-=Germania=-'s Audio Technica ESW9 Mod(s)


Today I am pleased to be able to reproduce an article which my friend on Head-fi, Stacy of sarn-industries.com wrote on the modification of the Audio Technica ESW-9 cans to give better reproduction and better overall sound stage presentation. Kudos to Stacy for allowing me to reproduce her wonderful article. The details are the copyright of Stacy of sarn-industries.com (aka -=Germania=- on Head-fi) and may not used for commercial purposes.

-----------------------------------------------------------------------------------------
Hey guys,

I thought that I would post some of the modifications done to my pair of ESW9's that was picked up last week (delivered beginning of this week). As with any of the modifications that I post or do, they are all reversible.

NEEDED SUPPLIES:

1 - Pair of Scissors or Xacto Knife
1 - Small sheet of Damping Foam (I used Sticky-backed 1/4" EVA foam)
1 - Quarter (as in $0.25 American)
1 - Pencil
A small amount of polyester or cotton stuffing



STEP ONE:
Remove the Pads


STEP TWO:
Remove the Black Woolen film (we won't be putting this back, but you might want it for reversing)


STEP THREE:
Open up the cups with a small screwdriver (be sure not to loose the screws)


STEP FOUR:
Remove the creme colored batting from behind the driver


STEP FIVE:

- Trace a Quarter FOUR times on the sheet of damping foam
- Cut out the four circles
- Cut a small hole in the center of each (just like teh small hole in the center of the driver)
- Take two of the circles and proceed to cut them into thirds (Layer 2 - step two)
- Take those pieces and trim them to look like Layer 2 - Step 3


STEP SIX:

- Place the Layer 1 circle on the back of the driver, making sure that it is centered.
- Place the Layer 2 pieces on top of Layer 1 just like how they were cut in STEP FIVE (should look like a radioactive sign)
*The layers stacked should look like above*


STEP SEVEN:
Assemble the cup back together with the screws


STEP EIGHT:
Put the pads back onto the headphones


STEP NINE:[/B]

Stuff under the back half of the pads (the part that sites at the back of your ears). This will create angled drivers.


STEP TEN:
Listen and Enjoy!




****BASSHEADS****

Don't add the LAYER 2 of the Damping Foam and be prepared for head-knocking amounts of bass.


As a side note to get the EVA foam stuff.. RadioShack is clearing out all of their Thermaltake stuff. Pick up their computer damping kit, it uses the same foam and should end up about $5-7 with plenty left to damp your computer or just whatever.


Cheers!
-=Germania=-

Saturday, February 21, 2009

Swans Hi Vi RT1II Isodynamic Ribbon Tweeter

I currently use a pair of Swans Hi Vi RT1II Isodynamic Ribbon Tweeters which I have added to my main speakers, these are placed on top of my main speakers and add more ambience, timbre, detail, presence and aire to the music.Pic 1: Dimensions.


Pic 2: Frequency Response.


Pic 3: Impedance.


Information on the Swans Hi Vi RT1II Isodynamic Ribbon Tweeters:

Film membranes, shielded Neodymium magnet systems and aluminum faceplates. Distinguishing features are almost perfectly flat impedance with fantastic speed, resolution, and transient response.

Pic 4: Front of Ribbon Tweeter.


The conductors cover about 90% of the whole vibrating area. The membrane assembly is precisely placed between two rows of Neodymium bar magnets. It is also well suited for 3-way applications This tweeter is magnetically shielded and is an extremely flat driver. A larger membrane and radiating area, providing higher power handling and a substantially lower cut off frequency.

Pic 5: Rear of Ribbon Tweeter.


The large membrane is thermally attached to the cast aluminum faceplate providing cooling and dramatically increasing dynamic range. Harmonic distortion is only 0.7% (94dB SPL) and has 106dB the output of continuing sound pressure and 110 dB SPL minute peak response. The RT1ii is available with different faceplates. RT1ii possesses unsurpassed clarity, transparency, and the ability to deliver every tiniest musical detail. Since RT8ii has exceptional ability to reveal the dynamics of instruments and sonic resolution, it is recommended to match it with drivers having similar properties in order to maximize the overall integrity of a speaker system. Always use an inline capacitor to protect the ribbon - 0.47 uF Audiocap Theta + 1.0 uF Audiocap Theta.


RT1II Isodynamic Tweeter
Nominal Impedance (Z)(Ω) : 5
Nominal Power Handling (Pnom)(W) : 15
Sensitivity (2.83v/1m)(dB) : 93
Weight (M)(Kg) : 0.30
Magnet System : Neodymium
Recommended Crossover Frequency(Hz) : >3500Hz












An extract from Yahoo Guides: by: camino3x2

Ribbon, Quasi-ribbon, and Magneplanar drivers all work on the same principle. The difference is how much of the driver surface is also the electrical conductor. In each case, a thin membrane which may be aluminum foil, high-grade Polyester or Kapton (but if you imagine it as household aluminum foil or plastic wrap, you'll have a good mental image) stretched and anchored in some kind of frame. The frame also secures permanent magnets close to the conductor. The aluminum foil is conductive on it's own, the plastic film has a foil or wire conductor glued to the surface in some kind of pattern. The conductor (the sheet of aluminum, or the foil or wire gridwork on the plastic film) becomes magnetic because of the electrical current of the amplifier signal, and wiggles in the magnetic field produced by nearby permanent magnets. The wiggling moves the air, and so produces sound. So, to recap: There is a stable magnetic field supplied by a non-moving set of permanent magnets. The musical signal from your amp is supplied to the flexible conductor, which moves to produce sound.

Ribbon:
A ribbon driver is a flexible sheet of conductive material--aluminum foil for example--that is anchored on it's edges and passes the amplifier's output signal. The action of conducting electricity makes the conductive sheet an electromagent. Because it is located within the magnetic field of some permanent magnets, it is attracted toward and repelled away from those magnets, depending on which direction the alternating current of the amplifier's output is flowing through the conductive sheet. Because it wiggles back and forth, it produces sound of the same frequency as the amplifier signal. The entire sheet is conductive, so the entire sheet--within it's mechanical limits--is attracted and repelled by the magnetic forces. Because ribbons don't handle lots of electrical current very well, they are generally used only as high-frequency drivers--tweeters. A ribbon driver assembly can be mounted in a conventional box speaker, there are several commercially available loudspeakers that use a ribbon tweeter or supertweeter.

These pictures below are taken from www.lcy.com.hk and are copyright of LCY

Click on above image to enlarge.