I don't know. They are the values from the EV/University Sound spec sheet. Midband with an 8 ohm resisitive load seems like a reasonable guess. If you go to the frequency extremes the transformer limitations start influencing things more, so I would think they'd stay way from there when creating a general specification.I am curious to know at what frequency the impedance figures are taken?
Cheers 🙂
YES >
Many many moons ago I read or heard that 400Hz was the 'test standard'.
I always thought it strange that 1Khz wasn't used.
Many many moons ago I read or heard that 400Hz was the 'test standard'.
I always thought it strange that 1Khz wasn't used.
I thought it odd that PWK's "LB76" which used a K33 required a stepup transfomer on the midrange. LB76 doesn't sim "hot".
https://www.itishifi.com/archives//2010/01/klipsch-lb76-or-little-bastards.html
https://www.itishifi.com/archives//2010/01/klipsch-lb76-or-little-bastards.html
gee @Mister Audio - I missed your post re:680uH per piezo "trick" - that's very interesting - how much DCR would you say is allowable per coil?
In fact you need some DCR to tame resonance, or it would be unbearable.Something like 2 or 3 ohms.
Because the capacitance of a Piezo element measures as a 'Lossy Capacitor' the actual L/C resonance Q
is not actually "unbearable". Resistance in parallel with the coil is actually better for 'taming' than series DCR.
One of these per piezo terminal (so they're not close together) will add significant 'brightness & sparkle'.
https://www.ebay.com.au/itm/1650141...Cawvgqi8R7DFUBIX2xxXVCsA==|tkp:Bk9SR_LJy6PvYw
is not actually "unbearable". Resistance in parallel with the coil is actually better for 'taming' than series DCR.
One of these per piezo terminal (so they're not close together) will add significant 'brightness & sparkle'.
https://www.ebay.com.au/itm/1650141...Cawvgqi8R7DFUBIX2xxXVCsA==|tkp:Bk9SR_LJy6PvYw
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- I'd like to use this transformer as piezo stepup - which leads to use for the "8 ohm" primary?