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Stereo and 5.1 system: McIntosh, Vandersteen, Oppo...

cnolanh

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Ever since I was a teenager I've had some form of stereo system in my living space. Like many of us, I've tried many iterations of equipment — so I'm happy to say that my current systems are the most musically satisfying I've ever had.

Within the last decade I've also dabbled with surround sound. At one point I cobbled together a 5.1 system in my office. That was fun for movies and concert videos, but the equipment got redistributed various places and I gave away that AV receiver.

But now in this primary system I have an Oppo BDP-105 universal disc player. Not only does it have excellent sonics, it sports several digital audio inputs and can function as a digital preamp/DAC/processor. I feed it digital audio from sources including DAT, over-the-air TV, and a Mac Mini music server. Everything else in the system is straight stereo, and for a long time I just used the main 2-channel outputs on the Oppo. No complaints whatsoever.

I did, however, have another stereo amplifier available, along with a subwoofer and a single speaker that could serve as a center, so the wheels started turning...and now I have a system that with analog sources is normal stereo, but can reproduce 3.1 with digital sources playing through the Oppo. Right now I'm listening to Elton John on multichannel SACD, and it's glorious.

Here's the component list, with notes:

McIntosh C33 preamp — All analog switching goes through this heart of the system. If I ever add two surround speakers for 5.1, I can power them with the 20 wpc monitor amp built into the C33. How convenient! [EDIT: I’m now doing exactly that. See post 16 below.]
Pioneer M-25 amplifier — It's a fine match for the powering the main ADS speakers. I had been going back and forth between this and the MC2150 as my main stereo amp. But when starting the 3.1 experiment, the McIntosh was more appropriate for the additional channels (see below).
ADS L1290 speakers — I bought these in excellent condition from another AKer. They sometimes trade places with Vandersteen 2Ce speakers, currently in another room. [EDIT: The Vandys are back in this system. See post below.]
Harman Kardon T55C turntable — Semiauto belt drive has an Ortofon OM30 cartridge mounted.
Oppo BDP-105 universal disc player — Plays CD, DVD-A, SACD, DVD, Blu-Ray, and most anything else available on an optical disc. I'm also using it as a digital preamp/DAC/processor for decoding multichannel soundtracks and music. I recently set up the Oppo for 3.1 speakers, and have set the relative channel levels correctly in the Oppo speaker setup options. When using the Oppo as a digital preamp, I just turn the C33 volume control (for the main L and R speakers) to 12:00, which I used as a reference point for matching the channels, and then the Oppo's digital volume control smoothly manages the whole system volume. (I just have to remember to turn the C33 down again before, say, playing a record.)
Nakamichi RX-505 cassette deck — Re-belted and tweaked by perryinva a few years ago.
Tascam DA-20 DAT deck — I have quite a few DATs on which I recorded live music during the 1990s, as well as DAT archive copies of older media (mostly R2R). Now I'm digitally copying those DATs, in turn, into lossless files on the computer. That's a project for a separate post.
Pioneer RT-901 reel-to-reel deck [out of the photo on a side cabinet] — Unrestored except for new pinch rollers, this old beast is still a joy to use.
McIntosh MC2150 amplifier — Sounds great in stereo, as it should. In this case, I'm using the two channels as separate mono amps. The Oppo's center preamp output drives the left channel of the amp, which powers the center speaker. The Oppo's subwoofer preamp output drives the right channel, which powers the sub. With nearly 200 watts available to each channel, that's good for the sub, and one reason I chose to use this amp in this way. I'm sure it's overkill for the center, but at least nothing will clip (also because of Power Guard on the amp). Another big convenience is that each amp channel has a volume pot on the front panel. If I need to tweak the sub or center level slightly, it's quick and easy from there.
Soliloquy SAT5 center speaker — This is a single SAT5 lying on its side (I've also tried it vertically with good success, but the current furniture doesn't allow that). You can see that the TV (a cheap Westinghouse 720p) is not fully centered between the speakers because the room is tight. So the center speaker is just under the TV for anchoring dialogue to the image, but lying with its tweeter on the left for maybe a bit more centering of the sound. In practice the center speaker makes a huge difference for dialogue. Since I've long enjoyed watching movies just with stereo sound, adding the center was a revelation. The Soliloquy has a soft-dome tweeter, like the ADSs, though of course the three speakers don't sound identical. It's close enough to be enjoyable and not annoying.
NHT SW2si passive subwoofer — The McIntosh drives it cleanly and the sub adds significant heft below the ADS woofers. I have the Oppo subwoofer low-pass set to 40 Hz, and the L1290s are also getting a full-range signal. The sub reproduces the LFE channel of a movie soundtrack, as well as any digital musical content below 40 Hz. I have also tried the sub over in the corner by the window. In that position it was a little much, probably setting off significant room resonances. Placing it closer to the middle of the front wall, as shown here, sounds more balanced when listening from the sweet spot.

In the room but not seen here: couch, LP cabinets, RCM, bookshelves, desk, computer, etc. We call it the music room for obvious reasons. And it can become guest space in a pinch.:music:

Thanks for looking! Anybody else run 3.1 channels?

[EDIT: I've since gone to 5.1 by adding surround speakers. See post 16 below.]

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Great gear! Do think the room is letting the system sound as good as it could?

Thanks! Well, I can't change the structure but have thought about room treatments, etc., as the next level of refinement. I'm pretty happy with the sound right now, though.
 
That Oppo can also act as a music streamer, an internet movie service and a DAC as you probably know. I use my Oppo as my movie streaming device and occasionally a CD player.
 
That Oppo can also act as a music streamer, an internet movie service and a DAC as you probably know. I use my Oppo as my movie streaming device and occasionally a CD player.

Yes, I use the Oppo for Netflix and other streaming video, as well as for playing discs, and as a DAC for playing iTunes from a computer. It’s an incredibly versatile audio tool — which is what made me want to try it as a multichannel preamp.
 
Given that the BDP105 audio inputs are all digital I assume you are looking at digital sources? Or will you be processing input via HDMI and rely on ARC for audio?
 
Given that the BDP105 audio inputs are all digital I assume you are looking at digital sources? Or will you be processing input via HDMI and rely on ARC for audio?

Yes, as I mentioned above I've got multiple digital sources plugged into the Oppo's inputs (such a cool feature) so they can use the Oppo's DAC and processing. Analog sources plug directly into the C33 preamp.
 
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And now to complete the multichannel experiment, I've gone to full 5.1.

This week I rearranged some other equipment and brought two more Soliloquy SAT5 speakers into this system as L and R surrounds. Due to furniture placement, the surrounds are currently about six feet high and angled slightly down toward the listeners. They're powered by the monitor amp (20 wpc, with Power Guard) built into the McIntosh C33 preamp — the monitor amp can be used with an external source, so I'm feeding it from the Surround Left and Right RCA outputs of the Oppo BDP-105. So far the configuration works beautifully.

That high surround speaker placement is good for multichannel film and concert sound. I've also listened to music on a few multichannel (4.0, 5.0, and 5.1) SACDs, which generally sound excellent. I do know that for multichannel music listening it's recommended to have the surround speakers down at ear level, same as the front speakers. I may change up the furniture at some point to explore that option.

This has been a fun project, and now I'm on the hunt for more multichannel music. The two additional channels make a huge difference in ambience, while maintaining the same high fidelity sound of the rest of the system.
 
That’s about the most creative use of a C33 that I’ve seen! I bet it does sound nice.

Thank you! The C33 is amazing in its flexibility — shown again in this project. I think the C33's dynamic range compander is its only significant feature that I almost never use. Just a few times I've employed the compressor while watching a movie quietly late at night (works well for that). And once or twice I experimented with using the expander on heavily compressed music, but I never found settings that sounded fully natural.

But everything else? Tape loops, EQ (occasional tweaks of flawed recordings), mode switch (speeds diagnosis of any weirdness), record out bus, variable loudness contour, monitor amp, etc. — they all get used here.
 
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I've now moved a Technics SL-1600 into this system, in place of the HK T55C. That's mainly to facilitate cartridge swapping and comparing — I have multiple headshells for the Technics, but just one for the HK. Interestingly, the belt-drive T55C and direct-drive SL-1600 are both suspended tables and I find them about equal in their ability to isolate the tonearm/platter from footfalls, bumps, etc.
 
Ever since I was a teenager I've had some form of stereo system in my living space. Like many of us, I've tried many iterations of equipment — so I'm happy to say that my current systems are the most musically satisfying I've ever had.

Within the last decade I've also dabbled with surround sound. At one point I cobbled together a 5.1 system in my office. That was fun for movies and concert videos, but the equipment got redistributed various places and I gave away that AV receiver.

But now in this primary system I have an Oppo BDP-105 universal disc player. Not only does it have excellent sonics, it sports several digital audio inputs and can function as a digital preamp/DAC/processor. I feed it digital audio from sources including DAT, over-the-air TV, and a Mac Mini music server. Everything else in the system is straight stereo, and for a long time I just used the main 2-channel outputs on the Oppo. No complaints whatsoever.

I did, however, have another stereo amplifier available, along with a subwoofer and a single speaker that could serve as a center, so the wheels started turning...and now I have a system that with analog sources is normal stereo, but can reproduce 3.1 with digital sources playing through the Oppo. Right now I'm listening to Elton John on multichannel SACD, and it's glorious.

Here's the component list, with notes:

McIntosh C33 preamp — All analog switching goes through this heart of the system. If I ever add two surround speakers for 5.1, I can power them with the 20 wpc monitor amp built into the C33. How convenient! [EDIT: I’m now doing exactly that. See post 16 below.]
Pioneer M-25 amplifier — It's a fine match for the powering the main ADS speakers. I had been going back and forth between this and the MC2150 as my main stereo amp. But when starting the 3.1 experiment, the McIntosh was more appropriate for the additional channels (see below).
ADS L1290 speakers — I bought these in excellent condition from another AKer. They sometimes trade places with Vandersteen 2Ce speakers, currently in another room.
Harman Kardon T55C turntable — Semiauto belt drive has an Ortofon OM30 cartridge mounted.
Oppo BDP-105 universal disc player — Plays CD, DVD-A, SACD, DVD, Blu-Ray, and most anything else available on an optical disc. I'm also using it as a digital preamp/DAC/processor for decoding multichannel soundtracks and music. I recently set up the Oppo for 3.1 speakers, and have set the relative channel levels correctly in the Oppo speaker setup options. When using the Oppo as a digital preamp, I just turn the C33 volume control (for the main L and R speakers) to 12:00, which I used as a reference point for matching the channels, and then the Oppo's digital volume control smoothly manages the whole system volume. (I just have to remember to turn the C33 down again before, say, playing a record.
Nakamichi RX-505 cassette deck — Re-belted and tweaked by perryinva a few years ago.
Tascam DA-20 DAT deck — I have quite a few DATs on which I recorded live music during the 1990s, as well as DAT archive copies of older media (mostly R2R). Now I'm digitally copying those DATs, in turn, into lossless files on the computer. That's a project for a separate post.
Pioneer RT-901 reel-to-reel deck [out of the photo on a side cabinet] — Unrestored except for new pinch rollers, this old beast is still a joy to use.
McIntosh MC2150 amplifier — Sounds great in stereo, as it should. In this case, I'm using the two channels as separate mono amps. The Oppo's center preamp output drives the left channel of the amp, which powers the center speaker. The Oppo's subwoofer preamp output drives the right channel, which powers the sub. With nearly 200 watts available to each channel, that's good for the sub, and one reason I chose to use this amp in this way. I'm sure it's overkill for the center, but at least nothing will clip (also because of Power Guard on the amp). Another big convenience is that each amp channel has a volume pot on the front panel. If I need to tweak the sub or center level slightly, it's quick and easy from there.
Soliloquy SAT5 center speaker — This is a single SAT5 lying on its side (I've also tried it vertically with good success, but the current furniture doesn't allow that). You can see that the TV (a cheap Westinghouse 720p) is not fully centered between the speakers because the room is tight. So the center speaker is just under the TV for anchoring dialogue to the image, but lying with its tweeter on the left for maybe a bit more centering of the sound. In practice the center speaker makes a huge difference for dialogue. Since I've long enjoyed watching movies just with stereo sound, adding the center was a revelation. The Soliloquy has a soft-dome tweeter, like the ADSs, though of course the three speakers don't sound identical. It's close enough to be enjoyable and not annoying.
NHT SW2si passive subwoofer — The McIntosh drives it cleanly and the sub adds significant heft below the ADS woofers. I have the Oppo subwoofer low-pass set to 40 Hz, and the L1290s are also getting a full-range signal. The sub reproduces the LFE channel of a movie soundtrack, as well as any digital musical content below 40 Hz. I have also tried the sub over in the corner by the window. In that position it was a little much, probably setting off significant room resonances. Placing it closer to the middle of the front wall, as shown here, sounds more balanced when listening from the sweet spot.

In the room but not seen here: couch, LP cabinets, RCM, bookshelves, desk, computer, etc. We call it the music room for obvious reasons. And it can become guest space in a pinch.:music:

Thanks for looking! Anybody else run 3.1 channels?

[EDIT: I've since gone to 5.1 by adding surround speakers. See post 16 below.]

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Nice set up do those floor standers produce good bass? How does a passive sub work I have one but I have not bothered with it because it’s sub par compared to my active subs . Nxt is a good brand does it produce a lot of bass ??
Centers never sound like the fronts even when timber matched like mine.
 
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