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Proprius daisy-chaining for driving RAAL SR1a |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Going up from 1 watt in decibel increments:
0 - 1 1 - 1.26 2 - 1.6 3 - 2 4 - 2.5 5 - 3.2 6 - 4 7 - 5 8 - 6.3 9 - 8 10 - 10 (sounds twice as loud as 1W) 11 - 12.6 12 - 16 13 - 20 14 - 25 15 - 32 16 - 40 17 - 50 18 - 63 19 - 80 20 - 100 (sounds twice as loud as 10W) 21 - 126 22 - 160 23 - 200 24 - 250 25 - 320 26 - 400 27 - 500 28 - 630 29 - 800 30 - 1000 (sounds twice as loud as 100W) |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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I have been speaking with Heinz some more and he explained that the main reason that he did not implement a ribbon driver for K1000 or MySphere is because of the high power requirement needed to obtain a fast and precise impulse response. I assume Mr Slee, master of slew rate, is confident the Proprius can swing the voltage fast enough to get a ribbon driver to start and stop with the speed needed.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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While others were tied to a kettle element embedded in an aluminium block, containing a coiled stainless steel pipe, which had to be plugged into the mains, just to make damp disco smoke; I was busily writing up the patent application for a control system which instantly went from zero current to 95 amps. It used the stainless steel pipe directly as a heating element; infra-red receivers fed-back instantaneous temperature data to switch the current off, and back on to ensure the element did not melt; and an interlocked a pump fed triethylene glycol through it, such that it produced instantaneous smoke. It ran off a golf cart battery and was handheld and push-button controlled.
Remember induction loops for the hard of hearing? Do they still do them? They are circuits of single core conductors (laid under floors or embedded into walls), which are the equivalent of short circuits, but when fed by a power amp via a suitably rated power resistor, produce magnetic field signals which can be picked up by induction equipped hearing aids; not only within the loop but far beyond it. Sheltered housing developments might have 50 or so apartments, all equipped with 32-ohm speaker/mics for control centre communication. In the event of a fire or similar threat, communication with all occupants at once became an essential requirement. Not only was it a 0.6-ohm load, but it was very capacitive with all the wiring paralleled together via the switching. Damping factor is supposed to illustrate the control the amplifier has over the transducer in its ability to brake its movement. Try it. Damping factor is quite imaginary. It can only brake the movement in one direction by applying current flowing in the opposite direction. Therefore it would be better to call it the driving impedance. The ribbon headphones you have been inquiring about use a series resistance of approx. 5.6 ohms, to drive a 0.2 ohms stainless steel membrane. The amplifier's driving impedance pales into insignificance compared to the 5.6 ohms series resistance, because the driving impedance IS the 5.6 ohms series resistor (or series-parallel combination making up that value). How can it be any other? As for slew rate; it is important from an "inside the amplifier circuit" point of view, to reduce transient distortion, but I don't think many transducers (if any) would be able to respond and make full use of 90V/uS. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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Thanks Graham. By the way, the ribbon diaphragm material is aluminium, not stainless steel. I might see if I can borrow the SR1a on loan rather than buy blind. Curious to compare them to MySphere although I know neither will image like my newly-acquired Alpair 11MS speakers.
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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...taken
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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