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Tweeter question

 
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andre
Junior Contributor 10+


Joined: 22 Oct 2005
Posts: 18
Location: Oop North UK

PostPosted: Mon Nov 26, 2007 4:26 pm    Post subject: Tweeter question Reply with quote

Not to do with KEf but if the terminals on the tweeter are noy marked, is there a way of telling which is + and -. As in my TDL metal dome that i think are the same as what is used in there older monitor series.
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Mon Nov 26, 2007 4:51 pm    Post subject: Reply with quote

Find another lonesome tweeter where the terminals are marked from KEF, Peerless, Audax or SEAS.

Connect in series with the TDL unit, play detuned mono FM "hiss" through them (via a 4uF capacitor if you're into high spls), you'll soon work out the phase of the TDL unit and be able to mark accordingly.


Looking at a parent speaker's crossover won't help much as it may be an electrically out of phase, acoustically in phase design.
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speakerguru
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Joined: 18 Nov 2005
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Location: Green Hut, Tovil

PostPosted: Tue Nov 27, 2007 9:12 am    Post subject: Reply with quote

With enough light, it's normally just about possible to see the direction of movement of the tweeter diaphragm when you apply 1.5 volts from a dry cell. When it moves away from the magnet, the +ve terminal is the one connected to the +ve of the cell.

Use a cell rather than a d.c. power supply as the inherent internal resistance of the cell will limit the maximum current and prevent possible damage to the voice coil.
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