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odc04r View Drop Down
Old Croc
Old Croc
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Joined: 12 July 2006
Location: Sarfampton
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Points: 5482 		Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2020 at 9:32pm
Originally posted by madboffin madboffin wrote:

Looks like some quite clever level sensing and protection. The whole board uses high quality components, shame it fell to bits...


It is a fairly neat idea. I would imagine the circuitry rectifies the audio signal, then integrates, and at a certain sustained voltage level opens the relays via transistor switching to disconnect drivers.

The neat part of it is that if the signal level from the amplifier sustains, the drivers are not going to get reconnected till the signal drops down again.

The bad part is that if you don't build suitable hysteresis into the switching, it will be a mess. And not the best for the amplifier either if a load was being rapidly switched in and out of circuit.
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kedwardsleisure View Drop Down
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Joined: 20 January 2009
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Points: 4947 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2020 at 10:15pm
typical german over-engineering, trying to re-invent the wheel.
Shame they can't make drivers where the tinsel leads stay on
Kevin

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smitske96 View Drop Down
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Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2020 at 10:22pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

typical german over-engineering, trying to re-invent the wheel.
Shame they can't make drivers where the tinsel leads stay on

For the tinsel leads, you probably would have to adres Electro Voice.

Regarding the Electronics, I would say it probably is their 'voice coil tracking'.
XA2 and other models use it to. Why? Some added protection before they had their newer amplifiers with DSP. 
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