I saw in another video that it is not recommended to use the included BNC adapter board because of grounding issues - when not plugged in, there is no connection between the connectors, but once plugged in all four connect. They recommend building your own when using the audio analyser suite for differential grounding instead of the included adapter with common grounding.

I've been looking to audio-specific videos for the Analog discovery units for ages and this was supremely helpful 💪😁😁

Hey, thanks for this! This is hugely helpful. I just got a Analog discovery 2 and this software. Great little tool. I will be testing my amp on it tomorrow so I pull your video up on this. Miss your vids, hope all is good with you. cheers!

Thanks for sweeping your 6P1! I did your mods on mine so I think it's safe to assume a sweep on mine would yield very similar if not identical results (I too rolled the Soviet 6P1's and added vintage 6SN7's). I run mine into Klipsch RP-600M's and also have a vintage 80's Velodyne ULD-15 sub that I recently refoamed the surround. This is more sub than i need, so I just keep it relatively low. For for the 1 watt I'm getting before distortion kicks in, it sounds really good. But my winter project is definitely going to be hand-building a new amp, probably the 6SQ7 amp. Keep up the good work Stephe!

Hi Stephe, I'm glad to see you are getting similar readings to what I'm seeing with a used Analog Discovery unit I picked up on Ebay. I'm seeing the same channel imbalance on the 2 DIY tube units I quickly measured. THD was higher than I would have guessed too. But now knowing that part of that might be inherent in the signal generator in the AD makes me hopeful the actual THD is a bit lower than the measurements show. I'll have to run a loop-back test to see what that shows. Keep up the good work! Tom

Very nice ! And your 8 Ohms dummy loads are very nice too.

Thank you for a helpful video - as a DIYer I have always wanted to be able to measure output quality

Great video. Explains everything

This video is enough for me to subscribe and yesterday you were less than 1k subscribers but congrats on going over! Woo hoo!

Perfect explanation, thank you 🙏

To paraphrase Nelson Pass, if the first watt doesn’t sound good, what makes you think 100 watts will. I personally love a amp with 3ed harmonics. I like solo artists sure, but put some harmony backup singers in the song singing in 3ed’s, ha now the sound is getting rich, thick, tubby, lol . Great Video, Love your Stuff

I read about the 'problem' with the bnc connector board, that ALL grounds are connected.

I just started using this to test my 6BM8 build I am finding that on the frequency response graph, it shows a negative gain instead of around 15db at 1k. The amp sounds fine so not sure why a negative gain reading. Volume was set at 12 o’clock.

Are you using the Digilent BNC adapter? @TheStuffMade recommends not to. Does the Digilant card work correctly? Or do I need to build a jig?

I'm thinking to buy AD PRO 3250, as a technician I got many instruments, but to be honest I'm considering it for it's almost infinite features. I'm really curious to try the audio tool, so ,maybe my xmas gift 'll be this, the 3250 or 3450 if I can afford. The only thing stopped me till now is the workflow, so I would try it some days before buying, I'm not a pc based stuff super fan, anyway it seems what I want/need.

Very much enjoy your videos. I bought the analog discovery 3. I have tried to use it to measure the frequency response and distortion of a digital amplifier (Fosi audio ZA3). The distortion immediately registers too high and the sequence shuts down. Also - it seems the amplifier itself shuts down when the ground circuit between the amplifier and the analog discovery 3 is completed. Would appreciate your thoughts.

hi Stephe, i am having trouble installing the AudioAnalyzerSuite. i am using windows 11. i don't know if this is compatible with win 11. do you have a similar experience when installing this, if so, can you tell me what's the workaround please. thank you.

Hi Stephe, it seems the BNC to RCA adaptors are not part of the kit, You need to pick those elsewere, right?

Great video! I bought the discovery two because I want to learn more about this kind of stuff as oscilloscopes and harmonics have always seemed like black magic. Will you do a video that explains what you see and what significance it has on the amp, for example when you are trying to see if it is working or not? Also I have a nad 3020i with low volume on one channel, is the discovery 2 something I can use to "discover" what could be at fault?

Hi, where do you set the volume pot on amplifier testing? I get very different results at zero, 1/2 and full. Thanks.

Trying to find out if this will work the same way as AD 2 with the software you are using.

Hello, I would like to use it to measure THD of my tape deck. Do you think that it will be possible? Possibly, I could also write my own code for calculating Wow and Flutter.

Is this a windows only device or will it work with a Mac?

How would i check a preamps distortion with this, since it makes u choose 4 or 8 ohm?

What amplifier is that ?thanks 🙏

I'm not sure what software to download from Digilent. They seem to have a number of different software packages. Which specific one did you download to use with the audio analog suite? Many thanks for this video.