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Messages - Tranquility Bass

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16
One astute reader contacted us recently and asked why there was nothing on stereonet about our products as he was interested to find out more and get some user feedback but told us that the forum search always produced no results when searching for “Analog-Precision” so we had to investigate this for ourselves. For those not familiar with stereonet it is nothing more than a glorified advertising platform masquerading as some kind of ‘hifi community’ with the members being used as its captive audience but it is anything but a hifi community with its draconian style of censorship and restrictions unless you are willing to pay the $$$ to have some of them removed :(

Anyway check it out. It seems the reader was onto something here with a search for 'Analog-Precision' yielding absolutely nothing. Maybe I have got the spelling wrong but I checked numerous times and each time it yields 0 results. So the plot thickens ;)



Perhaps it is not returning a result because there is nothing to find ? I told the reader who contacted me that they probably didn’t find anything on stereonet because we have been blacklisted and the only thread that was specific to the Preamp has been completely removed by the owner of that forum, however I had the foresight to grab a copy of the thread before it disappeared and have provided a link at the end of this post where you can download it. The reason why this happened is that I believe the owner of that forum and one of its paying sponsors tried to undermine our business by attempting to siphon away prospective customers from us at a critical time of the pre-order for our 2nd generation Preamps. When I complained about it on this forum I received a very abrupt and threating PM from the owner of stereonet requesting that I remove a couple of statements which I refused to do and the rest is history ! Neither statements had anything to do with the underlying issue but more about the so called reputation of the owner of stereonet. 

You will also notice that we have not been added to their list of Australia made product websites even though we probably make one of the most sophisticated and technically advanced consumer audio products in Australia at the moment ! Apparently our website was added only for a very short period of time before it was pulled again ! Check it out analog-precision is missing in action !



Perhaps they don’t think we are worthy of any addition because in the owners own words we are just a bunch of ‘hacks’ struggling to get something to market whilst the owner of stereonet was hatching up plans with one of its paying sponsors to steal away prospective customers from us at a critical time ! And I am glad he agreed that our product works because I don't think he has ever created anything himself or understands how difficult it is !



Having said that, there are still some remnants and old posts that refer to our product or website on stereonet but we had to dig hard just to find one of them as the search engine has been crippled for anything to do with us !

https://www.stereo.net.au/forums/topic/310890-generic-dsp/?tab=comments#comment-4535353



To prove the forum search is not broken let’s try some other search terms such as ‘minidsp’ which I believe is not a sponsor but gets plenty of free plugs every day and all day long. Go figure ! All 22 pages of search results which reference this particular brand !! Not bad for a vendor that doesn't pay a single cent of sponsorship !



For what it is worth I had the foresight to take a copy of the only thread about the Ultimate-Preamplifier Mk-1 before it had been completely removed and have made it available below as a pdf download below including the owner requesting that I apologize to him which he later retracted from that thread before he removed the thread altogether! I won’t be apologizing to him for anything as he has a number of apologies to make to others before he seeks redemption for his own misdeeds.  Funnily enough I wasn’t banned out right although I can still log on but not post or access the PM’s but this was a while ago and I haven’t checked since !!



Download link to deleted thread below:

17
Does it do standard text files by any chance ?? The binary file could be used if you knew the format and convert it back to text ?

Otherwise if you have the convolver module you could run it on an external PC and link back into the Preamp using Loop-Through enabled mode ;)

Cheers
David

18
Firmware Updates / Firmware Update: TBA
« on: May 13, 2021, 04:16:04 AM »
Firmware Version: TBA
Firmware release date: TBA
Tested On: UP2, UPP
Status: Testing
Description:
Added standby mode to Preamps configured as Slave Devices in Master/Slave setup.
For the microphone input converted single left channel to left + right channel for measurement purposes.
For the UPP fixed problem switching from 2-ch Preamp mode to Multi-Channel Direct mode and back again.
Matched level on 2-Ch Preamp mode which was 6dB lower than 2-Ch Direct DAC mode when playing DSD files via the 2-Ch USB interface.
For the RC testing menu have redefined the correct data fields to match the data packets.

Recommendations: To avoid unnecessary side effects after updating the firmware it is recommended to do a factory reset to initialize the non volatile memory to a known state. You should note the current settings before doing this as these will be cleared. This can be accessed from the front panel ie [Main Menu] -> [Setup] -> [Setup User] -> [Factory Default / Push Center Button]

References:

How to upload firmware updates to the Ultimate Preamplifier

This firmware download link below:






19
Wiki and Q&A / Re: Room correction with Dirac live on UPP
« on: June 12, 2021, 12:08:06 PM »
See this thread for updated info on using Dirac with the Ultimate-Preamp.

20
Can you post the file that Audiolense generates and what file formats are available ??

I just checked Audiolense has a convolution engine that can be run on a PC https://juicehifi.com/audiolense-convolver/

If you have a UPP you can run your crossover on the Preamp using Audioweaver and then setup Loop-Through mode on the Preamp to hook into the convolution engine running on an external PC.

Regards
David

21
Once I matched the recording device settings of the UPP incoming sound device to the sample rate I used for the DIRAC processing then it all appeared to work !! It is also possible reinstalling the USB 8-channel driver may have had something to do with it as well. It is now the latest version 4.67 of the driver ;)

HINT: In the future it will be better to do all sampling and processing at 192kHz rather than 44.1kHz to take full advantage of the processing capabilities of the Preamp provided the PC can handle that rate which I don't think is an issue with most PC's and Laptops these days ;)

 


 


 


It works !! Shown here is a Pioneer PD-6 playing the very best of Fleetwood Mac through the Preamp with DIRAC DRC processing enabled !!

 





22
Ok some more progress. I can get audio out of the UPP into the PC and listen to it on the headphones connected to the PC. Here are the Windows sound device settings.

 


 
   

 

 




23
There seems to be an issue getting the audio stream from the Preamp into the PC for Dirac to use so maybe some Windows Sound device aficionados might be able to chime in here.

I can route the audio from the Preamp into the headphones on the PC but as soon as I try to switch it to use the Dirac virtual sound device everything goes dead. Using it under Windows 10 doesn't help either.

24
Now we are only interested in using Dirac with the Preamp and not through any resident PC sound device. To do this Dirac facilitates this through a virtual sound device which can be found in the Windows Sound Control Panel. Make sure you set it as the default playback device as in the following.



In the recording devices we need to pipe the audio from the Preamp into the PC by setting the properties for UPP incoming audio device by right-clicking on it.

   

Set Playback through the default device or the Dirac Virtual Audio Device.



For the UPP to use the Dirac processed audio we need to enable loop-through mode on the UPP.



When Loop-Through mode has been enabled on the UPP a plus sign will be appended to the DAC Source on the Master Volume Control Menu. If you have implemented a multi-way active crossover on the UPP using Audio Weaver then it would show up as "Preamp (Multi-Ch)+" but in this case we were just using a full-way passive speaker as the simplest of examples.






25
And now the calculated filter is running on the Dirac Live Processor which we have labelled as AP  ;) Dirac allows multiple correction filters to be selected too so this may help when running different speaker setups.


26
The uncorrected speaker measurements are shown below.



Now the calculated correction filter is applied and end result is shown below.


27
Now we do the measurement according to the Dirac instructions.

 

In this example we didn't bother with the multiple measurement sweep as we are just interested in the procedure at this present time rather than absolute accuracy.


28
For this example we are using a simple two channel desktop studio setup with two speakers in close proximity to the microphone or listening position but it is possible to use a Home setup if that suits your needs. The idea here is just to go through the motions of using Dirac rather than an in-situ audio setup.   

 

29
Check the volume calibration and the levels are high enough otherwise Dirac will later complain the levels are too low. You may have to adjust the master volume control on the UPP for normal listening level for example -30dB.

 

30
In this example we used a UMM-6 USB microphone from Dayton but we could also use a Microphone connected to the UPP but that is a task for another day. The advantage of using the UMM-6 mic through the PC is that you can take advantage of the calibration file supplied.


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