Bow to Ed
New Head-Fier
- Joined
- Dec 30, 2011
- Posts
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I raided a thrift store today and got some Logitech speakers for $1.50. They quickly met with my hammer and I harvested the drivers.
Quick measurements reveal that the drivers have 3.2 ohms of series resistance and about 18.5 uH of inductance. There are four of them. I thought they would be interesting headphone drivers despite their weight, size, and impedance.
Most headphone amplifiers would have an issue driving what are essentially 4-ohm drivers. In the speakers, two were in series and one had a 33u capacitor across it, making it a "bass" driver. The drivers are 46mm wide and have 33x17 mm magnets on the rear. For prospective headphone drivers, they are HUGE.
If I were to do this, I wouldn't want to hook them to any headphone amplifier; doing so would probably overload the current capabilities and cause the final output amplifiers to fail. An idea would be place a 2-watt 150 ohm resistor in series with each driver, in essence making a 150 ohm headphone with a decent amount of damping. There's no telling where that would get me because most of the power would be eaten up in the resistor, meaning I'd need a higher-power amplifier than what one normally has. I'm thinking orthodynamic power, although I don't have any and have never listened to them.
If I were to do this, I'd make open-backed cups like the higher-end Grado cans. I am getting a lathe shortly and will be able to turn cups out of any given wood.
There's also a possibility that this is a dumb idea and I should go back to the drawing board. Maybe it is. What are the thoughts of the people?
The drivers look like the ones in this picture...
http://static.productreview.com.au/pr.products/102954_logitech_x230.jpg
Ed
Quick measurements reveal that the drivers have 3.2 ohms of series resistance and about 18.5 uH of inductance. There are four of them. I thought they would be interesting headphone drivers despite their weight, size, and impedance.
Most headphone amplifiers would have an issue driving what are essentially 4-ohm drivers. In the speakers, two were in series and one had a 33u capacitor across it, making it a "bass" driver. The drivers are 46mm wide and have 33x17 mm magnets on the rear. For prospective headphone drivers, they are HUGE.
If I were to do this, I wouldn't want to hook them to any headphone amplifier; doing so would probably overload the current capabilities and cause the final output amplifiers to fail. An idea would be place a 2-watt 150 ohm resistor in series with each driver, in essence making a 150 ohm headphone with a decent amount of damping. There's no telling where that would get me because most of the power would be eaten up in the resistor, meaning I'd need a higher-power amplifier than what one normally has. I'm thinking orthodynamic power, although I don't have any and have never listened to them.
If I were to do this, I'd make open-backed cups like the higher-end Grado cans. I am getting a lathe shortly and will be able to turn cups out of any given wood.
There's also a possibility that this is a dumb idea and I should go back to the drawing board. Maybe it is. What are the thoughts of the people?
The drivers look like the ones in this picture...
http://static.productreview.com.au/pr.products/102954_logitech_x230.jpg
Ed