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Old 7th June 2018, 04:38 PM   #11
lisoformio is offline lisoformio  Italy
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Quote:
Originally Posted by avtech23 View Post
Despite being on our national coat of arms.. the EMU are pretty hard to come by here...
Any other recommendations for a good USB interface?
Focusrite Scarlett 2i2 (2nd Gen).
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Old 7th June 2018, 04:50 PM   #12
OlegSh is offline OlegSh
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Analyser recommendations
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Originally Posted by avtech23 View Post
Thanks Oleg, an interesting read.

Do you use the balanced - SE converter circuit in that thread?
Unfortunately not. Despite having all the parts at hands it is still on my todo list.
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Old 7th June 2018, 06:48 PM   #13
haiqu is offline haiqu  Australia
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Originally Posted by avtech23 View Post
Haha I could always tell her I thought it was $225.00 but the decimal point was in the wrong place!!
"That trick never works."
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Old 7th June 2018, 06:53 PM   #14
haiqu is offline haiqu  Australia
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BTW my memory was faulty, he wants over AU$2600 for them. Still a bargain.
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Old 7th June 2018, 07:45 PM   #15
Audio1Man is offline Audio1Man  United States
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Analyser recommendations
I repair, service & sell used Audio Precision test system and APIB USB Interface adapters to work with XP through Win10. I get many systems in my shop that were from EBay and many were used in a production line and do require many new parts so they can meet the SPECIFICATIONS. The cost is typical investment is $2500 or more and this typical leaves the hobbyist to use other equipment.
The QA401 and other analyzers are good alternative to the hobbyist who typically have limited budgets.
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Old 7th June 2018, 07:55 PM   #16
haiqu is offline haiqu  Australia
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Depends on what you need I guess. My sound card cost more than a QA401. Then again these are fairly low spec AP boxes so realistically I'd offer them far less than the asking price.
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Old 8th June 2018, 12:07 AM   #17
avtech23 is offline avtech23  Australia
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Analyser recommendations
I'm looking primarily for something to do basic measurements such as THD and FFT.

I want to quantify whether a board is at 1% or 0.1% etc (I don't think my ears are tuned well enough yet!) and the harmonic profile so I verify the effect of component selection or potential noise sources.

Honestly I would love to spend $2500 or more (buy once, cry once) but unless I can use it for production, I can't realistically spend that much.
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Old 9th June 2018, 05:08 AM   #18
1audio is offline 1audio  United States
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Analyser recommendations
The QA401 has several benefits over a soundcard, being designed for this task. It has a much higher input max (20V RMS), quasi-autoranging (switches in an input attenuator when the input goes higher) and it has differential in and balanced out. The software is pretty good and just works. There is hope for a soundcard interface capability in the driver soon.

However a decent soundcard can work fine with ARTA. However you will need to fabricate interface cables for amps so you don't fry your soundcard.

With a soundcard, interface cables and ARTA or RMAA you can test almost everything. Its just more work and clumsy. If you do it once then great. if you are troubleshooting daily probably not great.
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Old 9th June 2018, 06:57 AM   #19
phofman is offline phofman  Czech Republic
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Just a very low-cost way - The soundcard ESI Juli offers SE and balanced inputs /outputs working simultaneously (e.g. single-ended amp input, balanced output at class-D amp speaker terminals ) , 40Vpp full scale for the balanced input (i.e. between the positive and negative line), allowing to measure 20W/8ohm without any divider. While a regular PCI device, it can be used in a class II device, breaking any ground loop. It is an aged device but for less demanding tasks still quite capable Headless Amplifier Measurement Workstation
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Old 9th June 2018, 08:49 AM   #20
mbrennwa is offline mbrennwa  Switzerland
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At this price point, you'll have to decide between (A) the classical sound card + your software of choice or (B) a dedicated low-cost audio analyzer with it's own software.

(A) is flexible in terms of software choice, and you can always upgrade to a better soundcard as your requirements (and finances) change. The drawback is that soundcards usually blow up if you abuse them with excessive test voltages, and calibrating signal voltages in absolute terms is difficult because many soundcards have variable gain ("volume knobs") that are tricky to set to an accurate level. You could modify the pots with a stepped attenuator to get reproducible settings though. A notable exception is the RTX6001 "soundcard", which was designed for audio analysis from ground up. Its performance approaches AudioPrecision territory, but I guess it's a bit more expensive than what you have in mind.

(B) is the QuantAsylum route. I have no experience with those analysers, but I guess they do what it says on the box. You're stuck with their software, so if the software does not do what you need/want, you're screwed.

That said, I used a Behringer UMC 202 HD for a while. It's cheap, does 192 kHz, and works fine for loudspeaker work and everything else that does not require ppm distortion levels or accurate (absolute) voltage levels. I now have an RTX6001, and I love it. Audio performance is great, and the accurate signal level switches are soooo much easier to work with than the variable "volume pots".
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