Thanks to both Ray and thsmith for this evaluation. Lots of time, effort and $ were involved to add to the knowledge base. :cool:
I'm in for the AV--047528 if this happens. I probably won't be checking this thread a lot, so please pm me if this actually goes through.
Nakamichi CA-5AII Preamplifier (vintage 1990)
Yamaha TX-1000U Digital Tuner (vintage 1993)
Yamaha CDX-1110U CD Player (vintage 1988)
Adcom GFA-555 Mk II Power Amplifier (vintage 1995)
Polk Audio SDA CRS+ Speakers (extensively modified, vintage 1989)
Signal Cable Analog 2 Interconnects
Monster Cable Z2 Reference Speaker Cable
Signal Cable Power Cords (Pre and Power Amps)
It was a Night and Day change using the AI-1 Dreadnought..
But that was without burn in, which definitely improves the sound. That initial review was also written using crappy Monster speaker cable to connect to the AI-1. When I upgraded to a litz DIY design the improvement was even greater. To sum up, bigger soundstage, more relaxed and realistic sounding instruments, cleaner/clearer vocals.
If the 1000VA sounds even better this one's a no brainer.
I was on vacation when your thread was created and missed it entirely. Definitely seems like a worthwhile pursuit with the possibility for appreciative gains...and will be fun to try.
I've decided to push ahead and I placed my name on the group buy list for 2. If it doesn't work out for either or both of my rigs, I'm sure I'd be able to offer them down the road to a CP member that did not have the opportunity to do this right now.
Thanks for the link and your impressions,
I cannot reply to your PM because your in box is full..
I'm in if the AV-047528 order gets done!!!!
Yes!! And Yes!! Ray hit a home run with this last Avel transformer and I just got lucky they found the one I received, She originally told me there wasn't anymore to be had only to email me a couple days later that she found one and that it was the last one to be had..
Don't get me wrong the 800 works great (better then the original AI-1 and better then strapping the negs on the amp) the new AL 1000 takes it to a new level and my system sounds really sweet right now.
I haven't been upgrading anything for awhile now but my house has been my priority at the moment, new paint and gutters and having the roof looked at this week. So my between that and the Camaro my rig is taking a back seat for a few, but I'm very happy with it at the moment so no big deal..
Figure 1. The CRS+'s are 5'-1-1/2" apart inside edge to inside edge. I sit 8' back. The room is 11" x 11".
With the custom heavy gauge (9 AWG) interconnect cable, the sound stage extended wall to wall, but height was limited to the top of the speakers and depth was limited to the space between the front plane of the speakers and the rear wall.
With the 800VA Dreadnought, the aerial shape of the sound stage changed from a shallow rectangle to a wide "m" shape. Expressed another way, the sound stage shape changed to a crescent moon with a bump in the middle. The crescent peaks and the middle bump extended 1 foot from the front speaker plane. Sound stage height increased to just above, or up to 6" above, the top edge of the speakers a depending on the music.
With the 1000VA Dreadnought, the aerial shape of the sound stage was a deeper "m" shape. The crescent peaks and the middle bump extended 2 feet from the front speaker plane. Sound stage height increased to just below the top of the bookcases depending on the music.
I was surprised at the degree of spatial spread. Sound images that were confined to the space between the speakers moved in front of the speakers with the 800VA Dreadnought. The same images were moved to the side walls with the 1000VA Dreadnought.
Figure 2. On either side, the sound stage curves along the side wall: 1 foot forward with the 800VA
Dreadnought and 2 feet forward with the 1000VA Dreadnought.
Figure 3. "The cockpit" with nice vintage audio components."
Figure 4. Top to bottom: Nakamichi CA-5AII Preamplifier (vintage 1990), Yamaha TX-1000U Digital Tuner
(vintage 1993), Yamaha CDX-1110U CD Player (vintage 1988).
Figure 5. Adcom GFA-555 Mk II Power Amplifier (common ground amplifier, vintage 1995).
Figure 6. Comparing 1000VA Dreadnought on left and 800VA Dreadnought on right. The 1000VA won.
Figure 7. I shouldn't have done this. I took the PS Audio Power Plant Premier (PPP) AC regenerator from my
master bedroom system to try it out in the office system. Now I want one for the office.
Since I usually have to listen at "background music" sound levels, I appreciated the greatly increased low level detail, particularly with regard to image weight and bass definition and articulation. I initially thought the 800VA Dreadnought would be overkill in this small space, but it brought Such Good Sound that I was tempted to try the 1000VA Dreadnought...and after that, the AC regenerator.
The AC regenerator brought further enhancements in clarity, detail and holography, plus a small enhancement of depth beyond the boundary of the rear wall. However, the overall improvement with the AC regenerator was much smaller in degree than the improvement of the 1000VA Dreadnought over the 800VA Dreadnought.
In a small space, with vintage components of moderate resolution, including a classic common ground power amplifier, both the 800VA and 1000VA Dreadnought brought substantial improvements in clarity, detail, image weight and spatiality compared to a heavy gauge (9 AWG) custom interconnect cable. In the future, when I am more dedicated to audio than I am now, I can envision getting a used PPP AC regenerator for the office system...but I am trying to talk myself out of it.
Upgrade Jantzen Inductors for the CRS+ - Figures 11-13
http://i148.photobucket.com/albums/s...Devils/mad.gifYou are trying to talk yourself out of buying new audio gear? I can't imagine that you are trying too hard.
Really, I am trying to talk myself out of getting a PPP...because I really want a P3 AC regenerator for the office system.
Nice office setup DK.
What type of wires did you use to connect the Dreadnought to the CRS?
And cmon you know what the results were going to be with the PPP . Especially with all of those lights, EEs, and electrons floating around your work.:cheesygrin:
PS If you don't mind me asking who did the art work?
I'm a bit lost here.
Are you saying that all SDA models sound better?benefit with a custom external transformer over just a custom SDA cable even when using a common ground amp?
As are all of my modification reports, this is just a discussion of results and a suggestion for the interested reader to consider.
I've ordered the 1000VA transformer in the group buy - totally stoked to get that in the system.
Where did everyone purchase the 800VA Avel Lindberg Y236906? Looking to make one for future use. Googling gives me very little info. Just curious if they have to be bought direct from the factory or somewhere else.
I'm not sure I understand how this mod works exactly in conjunction with how it provides an improvement. I also fail to see what the transformer does when its just a single wire connecting each speaker.
I'm going to do some searching and reading on this today.
It's not a single wire, there is a postive and a negative, this is one reason why only certain SDA's can use the AI-1. Other SDA's are wired differntly. I was unsure all these years that it would provide a benefit for common ground amps, but apparently it does. For non-common ground amps it isolates the grounds of the amplifier so as not to damage the amp and/or speakers. In essence when using a non-common ground amp you are shorting the signal path when the SDA interconnect is in place, the isolation transformer eliminates the short.
There has been a lot of discussion over the years, but the search function is difficult to use. Try searching using Google. I'm sure others will chime in to either correct me if I misstated something or expand on the subject.
Thanks for the info Brock.
I assumed the blade portion was strictly for support but I see it is also attached to the negative terminals and carries a signal for the use of isolation. That makes sense now as to how it isolates with the use of non-common ground amplifiers.
I need to learn how the transformer works WITH common-ground amps to understand how this works to improve things. This is quite fascinating. Christ I'm going to end up dropping more in mods then I paid for my speakers. :razz: But oh the end result...