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#1
News Updates / Re: Ultimate-Preamp FS
Last post by Tranquility Bass - December 15, 2025, 02:05:13 PMNote: This is for the UP1 model and requires a license to use Audioweaver, which normally costs $100 per year subscription. However, you may be able to negotiate a good deal from DSP Concepts, as they are offering free lifetime subscriptions with Danville's preamps, which sell for $5k AUD ! When you consider what Audioweaver can do compared to the normal basic filter-only DSP solutions, it's not much to pay if you had to pay a professional DSP coder to write the custom code for you 
Regards ADMIN
Regards ADMIN
#2
News Updates / Ultimate-Preamp FS
Last post by PaulD - December 15, 2025, 12:39:47 AMHi,
I have one of David's Ultimate Preamplifiers for reluctant sale - I am moving overseas and selling off my audio equipment. It has been in a smoke-free environment and it is in perfect working order and sounds great. You can ask David about details of it if you like, he will know. I am asking $1500 for it and I am in Melbourne - I would prefer pickup if possible rather than organising shipping, but I can do that at the buyer's expense. If you are interested, please email me on tomson.dachshund@gmail.com. I am not sure if I get notified of PMs through my email, I don't log in here very often.
Cheers,
Paul
I have one of David's Ultimate Preamplifiers for reluctant sale - I am moving overseas and selling off my audio equipment. It has been in a smoke-free environment and it is in perfect working order and sounds great. You can ask David about details of it if you like, he will know. I am asking $1500 for it and I am in Melbourne - I would prefer pickup if possible rather than organising shipping, but I can do that at the buyer's expense. If you are interested, please email me on tomson.dachshund@gmail.com. I am not sure if I get notified of PMs through my email, I don't log in here very often.
Cheers,
Paul
#3
News Updates / Industrial Power Filters Beat ...
Last post by Tranquility Bass - November 13, 2025, 12:40:59 PMNot what the audio file industry wants you to know, but if they could sell you a bit of dirt off the floor, they would too !
Industrial Power Filters Beat Audiophile Power Conditioners 30x the Price, According to Engineers
QuoteEngineers have the graphs audiophile brands don't want you to ask for.
For years, audiophile power conditioners have been sold as essential upgrades for better sound. Yet when independent testers compared them to industrial filters used in laboratories, the results were hard to ignore.
What makes this gap even more striking is how little data high-end brands share about their products. Once you see how industrial engineers approach the same problem, the luxury price tags start to look strange.
Let's dig into what the numbers actually reveal.
Industrial Power Filters Beat Audiophile Power Conditioners 30x the Price, According to Engineers
#4
News Updates / Re: Are audio shows good for t...
Last post by Tranquility Bass - September 09, 2025, 10:15:28 AMWasn't long before the meme's started popping up 
#5
News Updates / Re: Are audio shows good for t...
Last post by Tranquility Bass - September 08, 2025, 11:16:05 AMAnd a regular poster on a very well known audio forum made the following comment
In other words, it's just a day out. It's not what exhibitors would want to hear. Priceless !!
In other words, it's just a day out. It's not what exhibitors would want to hear. Priceless !!
#6
Performance and Measurements / Re: NEW Jitter tests showing t...
Last post by Tranquility Bass - August 23, 2025, 10:01:25 AMAn excellent article
New Test Reveals How Vintage CD Players Outperform Modern Models Thanks to One Forgotten Design Choice
New Test Reveals How Vintage CD Players Outperform Modern Models Thanks to One Forgotten Design Choice
QuoteThe study shows how overlooked testing methods hid the true performance of both vintage and current models.
Lab tests have long been the final word on how CD players perform. Yet those tests rarely went beyond a few single-tone checks, leaving out the kinds of stresses that music actually creates.
Recent testing by NTTY filled in the gaps with a method that looked at clipping, distortion under load, and how digital filters behave with shaped dither. The results changed the story of how older non-oversampling and newer oversampling players really compare.
#7
News Updates / Re: Are audio shows good for t...
Last post by Tranquility Bass - August 10, 2025, 10:31:20 AMCase in point from a visitor to a show 
#8
News Updates / Are audio shows good for the i...
Last post by Tranquility Bass - July 26, 2025, 10:09:13 AMNot according to this article
https://www.headphonesty.com/2025/07/elitism-lazy-marketing-killing-audiophile-hobby/
IMO the only benefits appear to be for the organizers who make a killing from renting out pint-sized hotel rooms with poor acoustics, and for a few days only whilst all of the exhibitors have to pay extra staff to do the heavy lifting and grunt work !! It's literally money for old rope for the organizers
https://www.headphonesty.com/2025/07/elitism-lazy-marketing-killing-audiophile-hobby/
QuoteAudio shows are everywhere now. During the first half of the year, there's one almost every month. But for at least one longtime dealer, they've become more of a drain than a strategy.
"The amount of shows is stupid and the results from shows is even stupider," he said bluntly.
To be clear, he isn't against shows completely. He's done plenty of them. But in his experience, they rarely bring in new customers or deliver truly impressive demos. Most visitors aren't there to buy. They're just passing time.
He called it "audio tourism." People poke their heads in between errands or while waiting on their partners, with no serious interest in gear. And even when they do sit down to listen, the sound usually isn't anything special.
"Most of the sound at audio shows is just average," he said. "I don't think most people go to an audio show and get their doors blown off."
Some of the industry's frustration now comes from logistics. In 2025, several major events like AXPONA, SIAV in Shanghai, and Kaohsiung Hi-End Show all happened on the same weekend. This forced brands to pick sides on where to spend money and manpower.
And that money doesn't go far. Booth costs, labor, shipping, and lodging have all gotten more expensive, yet most companies still have no clear way to track return on investment.
Even shows that report big turnouts aren't necessarily bringing in the right crowd. AXPONA 2024 hit over 10,000 visitors, but the new Gen Z ticket tier, despite some growth, still made up a small slice of attendees.
"It's the same thing over and over and over again," he said. "There's nothing unique about any of them."
He doesn't think shows need to disappear. But if the goal is to grow the customer base, this isn't the way.
IMO the only benefits appear to be for the organizers who make a killing from renting out pint-sized hotel rooms with poor acoustics, and for a few days only whilst all of the exhibitors have to pay extra staff to do the heavy lifting and grunt work !! It's literally money for old rope for the organizers
#9
Crown Prince (PCL-1000) / Re: Model Information
Last post by dtximages - May 25, 2025, 11:01:13 AMHey I'm interested in your thoughts on this speaker. I just picked up a pair and found them VERY lacking in the bass region. Drivers all all moving but I feel there should be more on the bottom end. My Crown Princes don't hardly need a subwoofer, but the Prince sounds is nothing like that.
Could I need a woofer replacement? If so which ones?
Could the crossover be bad? How do I figure that out.
60hz and up, they sound AMAZING like all Duntechs but gosh this whimpy bass is giving me fits.
Could I need a woofer replacement? If so which ones?
Could the crossover be bad? How do I figure that out.
60hz and up, they sound AMAZING like all Duntechs but gosh this whimpy bass is giving me fits.
#10
FIR filter designs / Re: Group-delay correction of ...
Last post by Tranquility Bass - May 04, 2025, 02:21:59 PMFor those who have asked me whether this type of phase correction filter can be implemented on the SHARC DSP in our preamp then lets take a look if it is possible.
Firstly, we will have to throttle back the sampling rate to 48kHz to get close to the ball-park and that's assuming we want to run two stereo channels on the one DSP. Unlike the PC example above we don't really have an infinite amount of resources to play with. This can be done by selecting the base sampling rate for the board of 48 kHz by setting the appropriate DIP switches. To find out how to do this refer to the following application note on our forum https://analog-precision.com/forum/wiki-and-qa/how-to-change-the-native-sample-rate-of-the-preamp/
The theoretical maximum number of taps for the SHARC running at 392 MHz on our board is 786.432 MMACS divided by 48 kHz, which is 16384 taps for both channels running. This limits it to 8192 taps per channel which is the maximum theoretical limit. Of course, we don't want to aim for the maximum number of taps otherwise there won't be enough DSP capacity to run other tasks like the Preamp and the LR crossover filter itself.
Let's bring up Rephase, our trusty freeware FIR filter calculator, and have a play around. Let's try 2048 taps for starters. As one can see below there is too much amplitude and phase deviation in the lower frequencies so this FIR filter is inadequate.
Let's double the tap count to 4096 taps per channel. We get better phase matching but still a lot of amplitude deviation in the lower frequencies.
At 6144 taps, things look much better which gives us some spare DSP capacity for other tasks such as the LR crossover itself
Of course, if you are running only one DSP module per speaker, then there is the potential to double the tap count or sampling rate. But bear in mind that each doubling of the sample rate requires twice the number of taps to yield the exact frequency resolution, which in turn requires 4 times the DSP capability, which is why we had to throttle the DSP back down to 48 kHz but is still now well within the Preamps' capability for the stereo version.
Firstly, we will have to throttle back the sampling rate to 48kHz to get close to the ball-park and that's assuming we want to run two stereo channels on the one DSP. Unlike the PC example above we don't really have an infinite amount of resources to play with. This can be done by selecting the base sampling rate for the board of 48 kHz by setting the appropriate DIP switches. To find out how to do this refer to the following application note on our forum https://analog-precision.com/forum/wiki-and-qa/how-to-change-the-native-sample-rate-of-the-preamp/
The theoretical maximum number of taps for the SHARC running at 392 MHz on our board is 786.432 MMACS divided by 48 kHz, which is 16384 taps for both channels running. This limits it to 8192 taps per channel which is the maximum theoretical limit. Of course, we don't want to aim for the maximum number of taps otherwise there won't be enough DSP capacity to run other tasks like the Preamp and the LR crossover filter itself.
Let's bring up Rephase, our trusty freeware FIR filter calculator, and have a play around. Let's try 2048 taps for starters. As one can see below there is too much amplitude and phase deviation in the lower frequencies so this FIR filter is inadequate.
Let's double the tap count to 4096 taps per channel. We get better phase matching but still a lot of amplitude deviation in the lower frequencies.
At 6144 taps, things look much better which gives us some spare DSP capacity for other tasks such as the LR crossover itself
Of course, if you are running only one DSP module per speaker, then there is the potential to double the tap count or sampling rate. But bear in mind that each doubling of the sample rate requires twice the number of taps to yield the exact frequency resolution, which in turn requires 4 times the DSP capability, which is why we had to throttle the DSP back down to 48 kHz but is still now well within the Preamps' capability for the stereo version.