3x0

The Aeras was a delightful listen, and it was both both bold and appropriate to have it available for a side-by-side audition with the T2 (and the DIY Soekris DAC and SR-007Mk1 were just the right showmates). The Aeras seemed to lose very little in sound (a little bit of top-end extension/air and perhaps some bass solidity) while shedding 80% of the size and dozens of pounds in comparison. The build and aesthetics were absolutely top-notch for the production unit. This is an extremely attractive proposition for city and apartment dwellers, or those with generally limited space for a dedicated headphone system -- literally a smaller desk footprint than some Stax amps or SRX-Plus builds while having near-T2 performance levels.

Speaking of obsolete parts, I recently noticed this 3D-printable Sigma headband assembly uploaded by some kind soul: https://www.thingiverse.com/thing:1780659 Might come in handy for some of us with older Sigmas/Lambdas/Omegas (albeit the earcup Yokes would be different for the latter two). Might print out a few spares of the arc for posterity since those seem like the most fragile piece.

Eh, I'd be a bit skeptical on the cheapo DAC front especially when you're buying something from China on eBay or taobao or what have you. IIRC the Holo Spring and AudioGD Singularity 19 were hypothesized to be potentially excellent for the money, but I think they're garbage even if they were half of what they actually do cost. Might be a good idea approach the Soekris with skepticism too -- it could be great or it could also sound shitty like the others.

Based on the precedent of "progress" established by the likes of the Holo Spring and AGD Singularity 19, I'm not hopeful...

Honestly I'd be surprised if Stax's margin was anything less than 3x their cost. Yeah, even with several hundred (thousand depending on the build) going to labor and casework a commissioned DIY should be a much better deal.

Not sure it'd really make a huge difference considering commissioned builds could also have a substantial increment from "BOM" cost attributable to labor and casework (especially since they don't benefit from the scale Stax has for amp chassis). Was the XF4 correction really worth making? They're just power tubes in a hybrid tube/SS amp and all the XF/metalbase hullabaloo is way out of hand IMO.

Are those the original SR-O pads on the right (IME they look more brownish IRL but could just be the lighting)? If so, those are in pretty rough shape. I guess the Omega does deserve a lot of head time...

I was looking for a number of old headband arcs back in November but turned up dry. FWIW broken arcs can actually be "welded" back together by manufacturing companies specializing in plastics. Won't look quite the same as the original but it seems fairly inexpensive to do and thus might make more sense than hunting down rare plastic headbands. The variation in analogous parts is also pretty interesting (and confounding). In my research I found an obscure headband screw that you'd think would be identical across the older Staxen is actually different between the Lambda, Sigma and Omega (nevermind weird production differences in the arcs themselves)...

Aha, so the "fuzziness" comment was in response to the air! I don't find airiness and naturalness to be mutually exclusive. It's one of the reasons I really enjoy the Omega and Sennheiser electrostats. Would you contest the possibility of the honeymoon effect also being in full force? In all seriousness the bass on these was the Achilles heel for me but I'm eager to hear how they turn out on different amps vs. stats and the like.

Can't wait to hear what all the fuss is about re: 009+Carbon. I never really cared for the standard KGSSHV or the 009 separately but I'll approach this pairing with open ears. It will be hard to touch T2+Omega but I'll be curious to try the HE90 out of it. My experience with the latter on BHSE and then T2 was a complete upset from expectations and everything I've read. Too bad I don't have the BHSE lying around anymore to make sure I'm not insane (or deaf). I have to say I'm really jealous of @HemiSam's Carbon posted a while ago. That build fits my aesthetic tastes well.

Hmm, when you mentioned downsizing amps I thought Carbon, T2 and Aristaeus would be the last ones standing.

Seems like a waste of energy all-around in arguing positions that aren't really worth defending. The SR-007 Mk-whatever, SR-009, SR-Omega, HE90 etc. are so hilariously far from ideal that no state-of-the-art amplifier will really save them from themselves no matter the circuit properties, 60-year-old tubes or magic fairy dust. This is why I usually always post the same shit to those looking towards serious high-end audio: listen and draw your own conclusions. Flights and trials are chump change compared to the four or five figures required for these systems and it doesn't make sense to rely on any opinions from strangers on the internet. It shouldn't matter if someone decides to go with SR-007 + Carbon or SR-009 + WES as long as either keeps their owner dumb and happy. I'm sure the Carbon sounds fucking fantastic and I can't wait to hear it. And the SRX-Plus looks like it'd make a cute little baby brother for the T2...

After listening to both the Omega and HE90 out of the BHSE and T2 I have no idea what's what anymore. I'll just see if I can get a listen on the Aristaeus and some other less-than-honest options to judge for myself.

Congrats on the successful refurbishment of the HE90. I imagine the collection is quite extensive now especially with the even rarer actually-vintage Stax models. Picked one up quite recently, originally (and exquisitely) built by a fine member from here. If you manage to pick up an Omega again you should try them on the T2. The resolution and bass (really top-to-bottom) performance is seriously impressive, even coming after a BHSE. Truly the very pinnacle of what I have heard and I am very grateful for the contributors and builders of the design.

Any opinions with your other amps like the Octave? I'm still on the fence about grabbing something just for the HE90. My pair is pretty bass-shy even out of the T2 so I'm curious whether some design can ameliorate that glaring weakness.

One of my friends was eager to buy one second-hand at the $600+ they seem to be going for today. I'm feeling a bit relieved I steered him away... Seems like a pretty bad sign that the amp self-destructs when you plug into both the single-ended and balanced outputs.

Life expectancy for bio-cellulose drivers manufactured before 2005-2006 is approximately 10 years and that's being optimistic.* Sony basically made the R10 and CDX000 when biocellulose was just an impractical nascent concept just to show off that they could do it. They were never designed with functional longevity in mind. *For reference the biocellulose designs mass-manufactured beginning in the mid-2000s (e.g. Fostex) are on a mature enough technology/process that they will last decades at worst and outlive most listeners on average.

Impressive -- looking forward to seeing the results. Seems like thermal dissipation would be considerably more challenging going this route (among other things).

Softness was my first impression listening to the HE-1000 from the GS-X Mk2 right after SR-007 from the BHSE. HE-1000 just sounded overly smooth and polite.

This paper may help provide some context to museum-grade preservation. WRT using silica gel, this FAQ provides quite a bit of detail. Seems like as long as you don't go overboard on the silica and use it to stay at around ~50% RH, it can confer excellent mold protection through storage. Re: dust management, do any of you guys have reservations against using a DataVac for dust removal? Obviously it won't be directed anywhere near my stats but I've been thinking about using it on my BHSE rather than keeping it covered all of the time. It's quite powerful (i.e. the airflow can depress the keys of nonmechanical keyboards) so I'm hoping it wouldn't put anything inside the amp at risk.

Egads! SN #0021 allegedly, but seems a little dodgy. FWIR the lowest combo price over the past decade on record has been nearly 40% more (back in 2010). Seems worth paying 3% extra for PayPal + CC to cover one's ass.

Thanks Birgir. Do you think 4.7M-ohm would be "close enough"? I have the opportunity to purchase such an adapter pre-made, or have a new one made for slightly more. I'll obviously spring for the extra $$/time if the 0.3M-ohm makes a meaningful difference in not destroying the HE90 out of the BHSE...

Finally found a pair of HE90s (more for the novelty than anything else). Reading some mixed reports about the HE90->Stax Pro adapter spec -- should the bias line include a 10M ohm resistor or is 5M fine? The HE90 is from the pre-Meier series (no bias-reducing tweaks) and I'm going to use it with the BHSE. I suppose I could try changing the bias voltage from the BHSE PSU but that's way out of my depth and I love the SR-Omega too much to bother.

I'll have to hunt those down for entertainment. I remember a minor fracas with that guy when I said I believed the Omega to be more detailed and resolving than the face tweeter.

Blargh, I was afraid they were vinyl since that's exactly what they feel like. Could be worse e.g. the poorly-bonded pleather from the HE60s. I guess there's no way to really make them palpably more supple then? Dreaming of SR-007-style lambskin for them...