Lightspeed Attenuator - Best Preamp Ever?


The question is a bit rhetorical. No preamp is the best ever, and much depends on system context. I am starting this thread beacuase there is a lot of info on this preamp in a Music First Audio Passive...thread, an Slagle AVC Modules...thread and wanted to be sure that information on this amazing product did not get lost in those threads.

I suspect that many folks may give this preamp a try at $450, direct from Australia, so I thought it would be good for current owners and future owners to have a place to describe their experience with this preamp.

It is a passive preamp that uses light LEDs, rather than mechanical contacts, to alter resistance and thereby attenuation of the source signal. It has been extremely hot in the DIY community, since the maker of this preamp provided gernerously provided information on how to make one. The trick is that while there are few parts, getting it done right, the matching of the parts is time consuming and tricky, and to boot, most of use would solder our fingers together if we tried. At $450, don't bother. It is cased in a small chassis that is fully shielded alloy, it gets it's RF sink earth via the interconnects. Vibration doesn't come into it as there is nothing to get vibrated as it's passive, even the active led's are immune as they are gas element, no filaments. The feet I attach are soft silicon/sorbethane compound anyway just in case.

This is not audio jewelry with bling, but solidly made and there is little room (if any) for audionervosa or tweaking.

So is this the best preamp ever? It might be if you have a single source (though you could use a switch box), your source is 2v or higher, your IC from pre-amp to amp is less than 2m to keep capaitance low, your amp is 5kohm input or higher (most any tube amp), and your amp is relatively sensitive (1v input sensitivity or lower v would be just right). In other words, within a passive friendly system (you do have to give this some thought), this is the finest passive preamp I have ever heard, and I have has many ranging form resistor-based to TVCs and AVCs.

In my system, with my equipment, I think it is the best I have heard passive or active, but I lean towards prefering preamp neutrality and transparency, without loosing musicality, dynamics, or the handling of low bass and highs.

If you own one, what are your impressions versus anything you have heard?

Is it the best ever? I suspect for some it may be, and to say that for a $450 product makes it stupidgood.
pubul57
Would be nice to have a First Watt Lightspeed/B1, with the ability to toggle between straight and buffered (when needed), along with multiple inputs (3?)

yep;)

I think the XLR is a bit of a reach though. Alas...
Seems to be heating up again. Teajay, you're bold to try and speak for some middle ground on this thread. Many that post here are very reasoned and good folks. Like you have said in several of your recent posts, the issue is not with most of the seasoned, good-hearted posters here, but rather the builder of the LSA. On more than one occasion he has said active designers and those that prefer actives, do so for one of these (less than righteous) reasons. Yes, I am paraphrasing a tad, but spot on in intention.

- have a tin ear
- like distortion
- in it for the money only
- charging tooooo much
- LSA is absolutely THE standard

Fact is many Aphiles like actives because well executed ones sound more like music to us. No, we are not tin eared or crooks. No, we do not like distortion. Yes, we like natural sounding music. Fact is, many roads lead to this musical end!

Absolute statements by the builder are absolutely out of bounds here. He can argue his point if he like, but stay away from absolutes! The rest of us are free to use absolutes - to our own peril :-) Not the builder. Just my opinion.
"...fact is, many roads lead to this musical end!"

Very true - there will always be a place and purpose for well designed active line stages, and I have no doubt that there will be systems in which they sound much better than any passive might, for a variety of reasons.

Having found the LSA through the DIY thread, the one thing that never seemed to be the case was that George was primarily interested in making much money on this, or really making a business of it. Sounded to me like if he could pull it off, he would rather license his patent to other folks who might too think it is a good idea, collect some royalties, and spend some time surfing. And he seems to be a true believer in his approach - rightly or wrongly - which as you suggest, doesn't mean it is the only approach to musical satisfaction.
First to Grannyring,

Thanks for pointing out that the major and really only criticism, with a few exceptions regarding other posters nasty responses about me and my opinion on Paul's thread, has been the repeated posts of George not to educate and inform in a respectful way, but his arrogant position that only he knows what really produces music the right way which justs happens to be his linestage. You might have paraphrased his frequent putdowns of anyone who does not agree, but your spot on at seeing it. I also have brought in the subject of him using this thread for pushing and marketing in a way I have never really seen on an AudioGon thread before. If it's not for financial reasons then he must really be a total egotist and thinks his opinion and device are a true gift to the audiophile community. If you think it's bold of me to share my opinion on this ongoing love letter to George, thanks for the support and compliment.

Secondly to Paul,

I never participate and rarely visit any DIY sites on the web. I admit my ignorance regarding how George comes across on those boards in his statements. My home base is this forum and this community, that's what I care about. You who never in any of your writing comes across with either dogma or any arrogance at all, why do you chose to be an apologist for this designer over and over again on your thread? Not the position that he's of course entitled to his opinion like we all are, but you seem unwilling to address the kind of remarks that Grannyring pointed out that run totally through George's remarks on your thread. You just say,"George thinks he has a great idea, and will argue its merits", implies he does this in a respectful and tolerant way towards people who don't see it his way. I don't think the facts back that up. I just don't get it, are you dear personal friend of his? Just not your nature to give him some feedback about his arrogant and condescending remarks on this forum? Some how your support for his LSA would be negated by being more blunt regarding how he comes across? Maybe by nature you are talented diplomat and just want to stay above the fray, and stick to the subject of your post. However Paul, in my opinion, George has really screwed up your very good and informational thread for the above stated reasons. So my respectful request to you is instead of another "spin" like, "he seems to be a true believer in his approach-rightly or wrongly", share what your honest opinion is regarding his writing here, just a passionate fellow or an arrogant blow hard regardless if he would rather be surfing or not.
I agree with Paul. I have found George to be very passionate about what he is doing. I don't necessarily think he is the best communicator (and he has admitted such to me), and he can go overboard at times, but I think I know enough about people and their personalities to see that George just might be a little rough around the edges and that translates into a failure to communicate that can rub people the wrong way. In many ways he reminds me of Audiogon member Rauliruegas. Raul is one of the most passionate people I know when it comes to analog, and his participation in threads while well intentioned, can definitely alienate some people. Some of the same adjectives applied to George have been applied to Raul, and then some. On a personal level my dealings with both of these members have been educational and each has helped me with increasing the enjoyment of my system through their advice and in George's case, his LSA.

Sometimes you need to peel back the onion and get down into the other layers. I'd love to head down under to visit George and quaff a few beers with him. His personality reminds me of some of my blue collars buddies from back East.