Intro and My Main System

SwiftEnthusiast

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Hello, everyone. My name is Mike. I live in the vicinity of Austin, TX, USA. Audio has been an interest of mine for a long time, but I had gone without a home audio system I really enjoyed for over a decade after selling my old system when moving to another state. Since then, I had been making do with headphones, a tabletop radio, and a pair of bookshelf speakers driven by the audio amplifier integrated in my TV. That is, until I started finding some time to focus on this here and there about three years ago. I was thrilled to start the process of piecing together a system again.

Early in that process, I was fortunate to come across a pair of Meadowlark Swifts. They were a little bit of a project. One issue was that the drivers had been replaced with something I did not feel was a good substitute for the originals. In the course of looking into my replacement driver options, I found this forum. I was very grateful to learn that Pat McGinty hangs out here and was happy to help me with valuable information and a full set of NOS replacement drivers.

Around that time, I also acquired a Dynaco SCA-35 in working order and good condition to drive the speakers. Their initial role was a simple stereo system in my crowded office (repurposed bedroom). That was temporary until I could later migrate the system to my living room (had some dusty work going on that included drywall repair, tile repair, etc).

MySystem.jpeg
Fast forward to today - the system has found its way into my living room, has been through some variations, and seems to be approaching a relatively stable configuration that I am really enjoying. My living room is far from an ideal listening environment, but it is the best option I have in my home at present.

There is a closet to the left of this photo which has been repurposed as an AV closet. My sources (all digital) and a Marantz AV receiver live there. The Marantz is configured in pure direct mode to turn off some unused features (analog video circuitry, front display, etc) and bypass some audio processing (tone controls, EQ, etc). And its HDMI pass through feature allows listening to HDMI sources with the receiver in standby (it passes through the most recently selected HDMI source).

In my primary listening mode, the Marantz HDMI output feeds the TV, which currently also serves as the HDMI audio disembedder (also have a standalone disembedder which I plan to experiment with in the future). Then the audio is fed to a Schiit Bitfrost DAC, a Schiit Freya S preamp, the Dynaco ST-70 driving the Meadowlark Swift speakers and an Altec Lansing PSW-10 powered subwoofer. Still experimenting with the speaker positioning and orientation.

The Dynaco ST-70 is new to this system. It was introduced a few days ago, right after I finished putting it back together. The previously mentioned Dynaco SCA-35 and a FIrst Watt J2 have also spent time in that role.

The subwoofer helps reinforce the lower end of the Meadowlarks in this listening environment which is larger than you might guess from the image (open floor plan where the ‘living room’ is really just a designated subset of a much larger room).

The speakers in the console are ADC 404s. They allow for a secondary listening configuration when I want a little sound in the living area without waking up the preamp / DAC / stereo amp (save some burn time on the tubes, etc). They can be driven by the Marantz AV receiver L/R amplifier outputs or the TV’s stereo amplifier. I started with the former and currently trialing the latter. The former sounds a little better and allows significantly louder sound levels. The latter significantly shortens the analog audio signal path, allows the option of listening to HDMI sources with the receiver in standby, and allows for easier mode switching (just mute/unmute the TV vs going down two menu levels to change a setting in the Marantz). The DAC, preamp, and stereo amp are on their own switched power strip whose switch is easily accessible while standing in front of the console.

For about a year, the system had a 5.1 speaker configuration where the stereo amp handled the primary L/R channels and the Marantz receiver handled the center and surround channels. The Schiit preamp allowed switching the stereo amp source between the Marantz analog L/R preamp outputs (multichannel listening) and the stereo DAC output (stereo listing). It worked and sounded good, but in practice I found myself usually preferring the stereo listening mode, regardless of content channel configuration. And so I ended up simplifying things down to this dual stereo current configuration.

Those unused outlets above the TV allow the option of wall mounting the TV. A typical modern large screen TV sitting on the console would hide them. However, that TV in the image is near the maximum height that can be accommodated in my current configuration because that TV is mounted on a motorized lift that retracts down into that console. I am happy with that comprise as I feel it is sufficiently large for the viewing distances and I love that it can be out of sight when not in use. I plan to eventually hang a large canvas print on that wall. That will be the normal focal point of that wall (with the outlets hidden behind it).
 
The J2 sounds great to my ears. But I can’t answer your question at this time. Reason being that too much time lapsed from when I last listened with the J2 to when I introduced the ST-70. And the system simplification noted in my prior thread happened in that time frame as well.

There was some overlap where I owned the J2 and my SCA-35 had not yet developed a moderate hum problem that led me to take it out commission. I probably switched back and forth a couple times before the hum problem developed. The J2 sounded better to my ears (more transparent, better defined bass). However, the SCA-35 is much older with mostly original components. As has become clear now, the power supply capacitors were on their way out. So, it wasn’t at its best then. I am looking forward to revisiting that once I finish my SCA-35 project. I also plan to audition the J2 in the system again in the future as well. Currently, I am focussed on fixing the SCA-35 and some other system updates in the main system. Although I was happy with it how it sounded, I then had time to reflect on my journey to reach that point and wondered if I could improve things further by reintroducing some components I already had on hand...

My original choice of DAC and preamp for this system was a Denafrips Ares II and Khozmo passive preamp. I didn’t listen to it all that much in that configuration because the maximum output level was right around or just short of my typical preferred listening level, depending on the source and content. The situation was a little better with the SCA-35. This is what led me to swap in the Schiit components. The Freya preamp has three modes, ranging from a passive mode up to a JFET buffered mode with some gain. The latter mode allowed the system to meet the functional requirements with either amp and all sources.

Now that I have simplified the system, the requirement for this to play well with the Marantz analog preamp outputs is gone. And I have also learned more about the Marantz receiver and the Altec Lansing subwoofer, and how each were also reducing the system output level in their own ways. For the Marantz, it is just a matter of configuration and practice. For the subwoofer, the problem is simple (relatively low input impedance of ~6 kOhm), but not as easy to improve. There are multiple identified paths for varying degrees of potential improvement. I started with a quick crude option this weekened (alternate wiring config) and I am also considering a potentially better approach for the longer term (removing its speaker level input option, which I learned is the source of that low input impedance after studying its input board a bit).

Just to elaborate a little on why I have the subwoofer in the system. The Swifts sound great in my listening environment (open floor plan) without the subwoofer. And sometimes I listen to the system that way. But for music that that is more demanding in the bottom octave or so, the subwoofer helps provide a more realistic rendition (in my opinion, anyway). I owned another pair of Swifts a long time ago, when I had a smaller listening environment (more typical room size) and I was happy with them for years without any help from a subwoofer. I believe I am operating this subwoofer well below is full capabilities. This subwoofer was a little project (needed a new surround) I came across for what I felt was a pretty good deal. I figured it would be good enough to at least get the system going, and it has been. Some day, I may explore other options.


D&K Reintro.jpeg
Anyway, this weekend I decided it was a good time to try reintroducing the Denafrips and Khozmo into the system. And indeed it was. The other changes were enough to allow achieving my preferred listening level without maxing out the volume control. I need more listening time, but it is already clear these components will be staying in the system this time. :)
 
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