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Twin Audio Twin Audio is a manufacturer of hand made audiophile tube amplifiers.

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Old 20th November 2010, 04:16 AM   #11
borispm is offline borispm  Hong Kong
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Quote:
Originally Posted by borispm View Post
If you are using 8 ohm drivers, you can try two in parallel with one connected in series with a 8.5mH inductor and you will end up with a 1 1/2 way speaker. The volume should be 1.2L with the same 1/2" hole on a 1/2" thick baffle.
I mean you can try a 2-driver setup. They are in parallel, with one driver in series with a 8.5mH inductor.
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Old 21st November 2010, 03:40 PM   #12
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Boris,

The mini speaker to be developing is for desktop and near field listening. No need to play loud.
Why to use 8.5mH inductor (high value)? The inductor for Mark CHR-70 is 0.5mH only.
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Old 21st November 2010, 04:06 PM   #13
borispm is offline borispm  Hong Kong
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Tony,

The inductor is for a first order rolloff of one of the driver (let's call it bass driver for the time being). Without this "bass driver", the f3 will be something like 110Hz, which is far from impressive from any standard, and with this driver, the f3 can be extended to something like 90Hz, that's almost half an octave of bass, not to mention higher power handling. If I remember correctly, this inductor will give you a rolloff at 150Hz.

The other driver will be running fullrange as it is not in series with the inductor.

You may want to add a 3dB baffle step correction too.

Boris
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Old 22nd November 2010, 01:50 PM   #14
borispm is offline borispm  Hong Kong
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Tony,

I think you guys have some metalwork skills or have access to such workshops, right (I think your amps have metal cases)? You can try the experiment I don't have the skills and time to work on.

The design should be scientifically and in an average audiophile's view superior to conventional construction.

Scientifically, you get thinner walls, allowing smaller speakers, without loosing much strength (true for metal cabinets anyway) and you get better damping as well as a more complex, less peaky cabinet resonance mode.

You can go and tell any audiophile that it has the benefits of both metal and wooden cabinets, you get natural and uncolored sound and they will agree without doubts.

Boris
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