Huang Posted March 1, 2021 Share Posted March 1, 2021 Great idea perhaps a sub-forum here... Richard might even pop in with some of his knowledge. I no longer get to simulate circuits and verify them something I miss dearly. I don't know much about audio circuitry it would be fun to expand my knowledge. Honestly, though with all the things on my plate I would have little time to build anything no matter how rewarding it would be 😞 Link to comment Share on other sites More sharing options...
BKDad Posted March 1, 2021 Share Posted March 1, 2021 The amount of work to do this well is daunting. I had a hard time trying to imagine what target audience would actually benefit. 1 Link to comment Share on other sites More sharing options...
Huang Posted March 1, 2021 Share Posted March 1, 2021 I get it. Link to comment Share on other sites More sharing options...
nrenter Posted January 30, 2022 Share Posted January 30, 2022 Just throwing this out there… Anyone have a line on a QB-9 ready for upgrade (or even a QB-9/20)? I’ve got JohnnyR working his angles, but I though I’ll also engage the hive mind. Link to comment Share on other sites More sharing options...
ctsooner Posted January 30, 2022 Share Posted January 30, 2022 none here. If anyone will find it, it's Johnny, lol. Link to comment Share on other sites More sharing options...
TomicTime Posted January 30, 2022 Share Posted January 30, 2022 A great DAC for sure, the “ listen and measure “ switch for the filters is a great clue for sure. Best wishes on the search. Randy at Optimal in Santa Monica might also know., if Johnny R can’t find one…. I know you didn’t ask but IMO the Lampizator entry level dacs have tube magic. Best to you Jim 1 Link to comment Share on other sites More sharing options...
nrenter Posted January 31, 2022 Share Posted January 31, 2022 I just closed the deal for one just north of Austin. Should have it this week. I'll play with it for a few months before sending it back for the Twenty upgrade. 1 Link to comment Share on other sites More sharing options...
Holmz Posted January 31, 2022 Share Posted January 31, 2022 37 minutes ago, nrenter said: I just closed the deal for one just north of Austin. Should have it this week. I'll play with it for a few months before sending it back for the Twenty upgrade. As they say in Au… “Owmuchizzzit? And are they the bee’s knees for DACs? I have been considering a DAC, but most of the CD players seemed to be the smash for me… 🤐 Link to comment Share on other sites More sharing options...
ctsooner Posted January 31, 2022 Share Posted January 31, 2022 I got the Nyquist and love it. It sounds as analog and relaxing as any DAC I’ve heard under 50k. Some of the Vandy dealers sell them. There are some great ones , but from mom and pop companies. I get scared as they may need fixing down the line and will it be supported? Link to comment Share on other sites More sharing options...
GdnrBob Posted January 31, 2022 Author Share Posted January 31, 2022 @nrenter, Actually I have a recently converted QB9 Twenty lying idle as I just bought a Nyquist (Thanks @ctsooner). I was thinking of holding onto it for a back up, but considering how you want one, I would let it go. Bob 2 Link to comment Share on other sites More sharing options...
Stringreen Posted February 1, 2022 Share Posted February 1, 2022 Im using an Ayre C5xemp silver disc player......was wondering if anyone has compared that to the QB9 performance. Link to comment Share on other sites More sharing options...
ctsooner Posted February 1, 2022 Share Posted February 1, 2022 I e heard each individually,but that’s no way to tell. That 20 circuit that Charlie drew up in a college class and finally implemented was a game changer for them. It takes a great design to much higher standards. The. Adding better components as you go up in the line makes a 5 series a ref series (along with better mechanics like case etc. Link to comment Share on other sites More sharing options...
nrenter Posted February 5, 2022 Share Posted February 5, 2022 On 1/31/2022 at 3:31 PM, GdnrBob said: @nrenter, Actually I have a recently converted QB9 Twenty lying idle as I just bought a Nyquist (Thanks @ctsooner). I was thinking of holding onto it for a back up, but considering how you want one, I would let it go. Bob Bob, thanks for the offer. Unfortunately I’ve already pulled the trigger on the QB-9 DSD. It’s In the house, along with an AudioQuest Diamond USB cable. Waiting on a set of AudioQuest Water XLR interconnects to arrive. The slow roll is ok…I’ve been buried at work of late. Link to comment Share on other sites More sharing options...
ctsooner Posted February 5, 2022 Share Posted February 5, 2022 Great news. I love the Diamond usb. Link to comment Share on other sites More sharing options...
nrenter Posted February 13, 2022 Share Posted February 13, 2022 Ok…I’ve got things (initially) set up. Any advice for optimizing Roon / Tidal on a Mac Mini? Link to comment Share on other sites More sharing options...
ctsooner Posted February 13, 2022 Share Posted February 13, 2022 my friend says that using Roon with HQ Player allows it to sound it's best. Not sure how that set up works though. Link to comment Share on other sites More sharing options...
GdnrBob Posted February 13, 2022 Author Share Posted February 13, 2022 16 hours ago, nrenter said: Ok…I’ve got things (initially) set up. Any advice for optimizing Roon / Tidal on a Mac Mini? I just use Roon without any changes with my Innuos. I guess I could try making some changes, but worry I will be setting myself up for a major PITA effort. I have no experience with Mac products, though I doubt it would make any difference in playback. B 2 Link to comment Share on other sites More sharing options...
nrenter Posted March 5, 2022 Share Posted March 5, 2022 So…I just sent my QB-9 DSD off for the Twenty upgrade. Well, repair / upgrade. I noticed an output discrepancy between the channels (about 3 dB, according to my Nakamichi Dragon VU meter). I figure that’s my excuse to upgrade sooner rather than later. Link to comment Share on other sites More sharing options...
TomicTime Posted March 5, 2022 Share Posted March 5, 2022 one reason why it is helpful to have a 1k test tone FLAC file as well as CD plus LP test record… Good luck on and congrats on Twenty series upgrade !,,,, supercool Jim 1 Link to comment Share on other sites More sharing options...
Bruskie Posted March 7, 2022 Share Posted March 7, 2022 Hey Bob. I am possibly looking for a used DAC as an upgrade to the Chord MOJO portable DAC I've been using for the last 5 yrs or so. How much do you think you would want to part with it? I was going to buy an Auralic Altair G1 unit from Johnny R, but after meeting with him this weekend I think I need to save up for either RH or WT AQ bi-wire speaker cables which are quite costly. So, I'm thinking of just getting a used DAC and continue using my MacBook as a server. I don't know if this would sound as good as the Altair G1 with my computer but it is just a thought. If anyone has any advice I would appreciate it. Thanks Bruce Link to comment Share on other sites More sharing options...
BKDad Posted March 7, 2022 Share Posted March 7, 2022 Reviews are one person's opinion. They should be taken as such. Still, I find that accumulating as much information about a subject as I can find to be valuable. Worst case is that you find the reviewer to be a creep and you can ignore him or her. https://audiophilestyle.com/ca/reviews/review-ayre-acoustics-qb-9-twenty-r892/ Link to comment Share on other sites More sharing options...
Holmz Posted March 7, 2022 Share Posted March 7, 2022 20 minutes ago, Bruskie said: Hey Bob. I am possibly looking for a used DAC as an upgrade to the Chord MOJO portable DAC I've been using for the last 5 yrs or so. How much do you think you would want to part with it? I was going to buy an Auralic Altair G1 unit from Johnny R, but after meeting with him this weekend I think I need to save up for either RH or WT AQ bi-wire speaker cables which are quite costly. So, I'm thinking of just getting a used DAC and continue using my MacBook as a server. I don't know if this would sound as good as the Altair G1 with my computer but it is just a thought. If anyone has any advice I would appreciate it. Thanks Bruce How do those 72 biased systems work? Do they have big blocking caps in the system? (And why don’t they do that on the interconnects?) Even I got a DAC en route, so I guess it is a thing. (It is sort of third world to plug the earphone 1/8” wire into an RCA adapter, but it works surprisingly well.) Are you using Roon? Or what are you using as the media server software? Link to comment Share on other sites More sharing options...
Bruskie Posted March 7, 2022 Share Posted March 7, 2022 @Holmz I don't know much about the 72dB biassing but it has to do with aligning the polar molecules within the dielectric insulation with an electric field provided by the battery pack. The constant field maintains alignment and reduces the tendency of the molecules to relax back into a random orientation. Thats about all I can figure out from the reading. No I don't use ROON or know how to use it. I'm simply using CDs ripped to AIFF files in iTunes on my MacBook Pro, with a USB C to Micro USB cord into the MOJO. If I get a better DAC I will probably expand into streaming and ROON. Bruce 1 Link to comment Share on other sites More sharing options...
Bruskie Posted March 7, 2022 Share Posted March 7, 2022 @BKDad I just read that article while researching Bob's QB9-Twenty. Good read, thanks. Bruce 1 Link to comment Share on other sites More sharing options...
BKDad Posted March 7, 2022 Share Posted March 7, 2022 52 minutes ago, Holmz said: How do those 72 biased systems work? Do they have big blocking caps in the system? https://patents.google.com/patent/US7126055B1/en Link to comment Share on other sites More sharing options...
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