I purchased a while ago, the Luminous Audio Axiom, Series 2, with Walker Mods, 3 in, 2 out, single ended, with remote, and I love it. It is not LDR based. Enjoy ! MrD.
Tortuga Preamps
Passive with LDR and balanced connections.
Purportedly very transparent as it does not use transistors.
However, measured here:
https://www.neurochrome.com/tortuga-audio-ldr3/
The data seems to indicate significant distortion at attenuated volume levels.
If so, does this conflict with subjective opinions of transparency? How would this distortion manifest in listening, examples?
Anyone happy with theirs?
Thanks for your input
Purportedly very transparent as it does not use transistors.
However, measured here:
https://www.neurochrome.com/tortuga-audio-ldr3/
The data seems to indicate significant distortion at attenuated volume levels.
If so, does this conflict with subjective opinions of transparency? How would this distortion manifest in listening, examples?
Anyone happy with theirs?
Thanks for your input
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- 18 posts total
The data seems to indicate significant distortionBeen there and done that with "active forced matching". I use "quad matched" sets of the far more expensive NSL32RS2S "sorted" LED/LDR’s which also go lower in impedance than the non "S" version, then none are "over rev’d" as they all "rev" the same. By using "active forced matching feedback type circuitry", which btw measures the the output resistance of the ldr’s, makes it an active preamp not true passive. KISS: spend the "man hours to quad matched them" at different points, and then they all "rev" at the same, and also stay totally passive, and sound better for it. https://www.digikey.com.au/products/en?keywords=NSL-32SR2S https://www.digikey.com.au/product-detail/en/advanced-photonix/NSL-32SR2/NSL-32SR2-ND/5039808 Cheers George |
George manufactures the Lightspeed Attenuator. One of the the best bargains in audio. I have owned one for 10 years it seems. My old friend Pubul57 (RIP) started this thread years ago to discuss the Lightspeed: https://forum.audiogon.com/discussions/lightspeed-attenuator-best-preamp-ever?highlight=lightspeed%2... |
- 18 posts total