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LinearX LX500
LinearX LX500
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Old 17th October 2014, 04:30 PM   #1
danils is offline danils  Europe
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Default LinearX LX500

Hi Mates,

I am looking for an audio analyzer to buy. I was quite resolved for an AP 515 when my attention was distracted by this unpresuming box:

LX500 - Precision Audio & Acoustic Analyzer - 1

Does anyone has experience with it? Does it compare with the 515? It cost about half the price. What about its software?

Basically I am looking for investigating small signal stages. FFT, THD+N and other basic measures...

Many thanks
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Old 26th October 2014, 03:51 AM   #2
1audio is offline 1audio  United States
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LinearX LX500
Look at a QA400 https://www.quantasylum.com/content/Products/QA400.aspx if your not doing this for a living. If you are there are a number of instruments that are well suited to the task and most are on a par or cheaper the AP515. If you are outfitting a production line its a different story.

More here: http://www.diyaudio.com/forums/equip...ml#post3396418
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Old 26th October 2014, 04:40 AM   #3
siavashr is offline siavashr  Canada
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I'm on the same boat. I'm looking for something that I can make reliable consistent measurements with (small signal mainly). QA400 seemed promising at first, but after reading this thread it seems like it has many (mainly software?) issues and not ready for serious use yet.
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Old 26th October 2014, 05:50 AM   #4
1audio is offline 1audio  United States
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That's an old thread and for professionals it may not be ideal. It was designed for manufacturing environments in China which is why its so cheap. I have had good results and find its well suited to mobile electronics. Its not for acoustics and needs help for dealing with higher signal levels. However at the price your options are quite limited. You could get a used analog analyzer or a soundcard and then deal with software and system instabilities. It depends on what you want from your measurement efforts. If you need state of the art its really only a few options and they are all $25K +.
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Old 27th October 2014, 05:08 AM   #5
siavashr is offline siavashr  Canada
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Thanks for your input Demian. I guess for $200 you can't really go wrong.
Is it easy to measure harmonic distortion with QA400? I don't mean the THD, but the individual harmonics 2nd, 3rd, 4th, 5th ...
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Old 27th October 2014, 06:58 AM   #6
1audio is offline 1audio  United States
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LinearX LX500
Its pretty easy to see the amplitude of the individual harmonics and there is a cursor to measure them. It does do an accurate calculation of the THD and THD + N. As an analyzer is pretty easy to use once you get comfortable with the controls. As a source its a little unusual since the source is not continuous so using it as a source to something else won't be useful. For $200 its a good deal and has good support behind it.
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Old 27th October 2014, 10:26 AM   #7
danils is offline danils  Europe
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Nice little thing. I am currently negotiating a R&S UPL audio analyzer. If the negotiation will go bad I will think to the QA400.
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Old 28th October 2014, 01:32 AM   #8
RNMarsh is offline RNMarsh  United States
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Unfortunately, eBay prices on used analyzers has gone up a lot since we have been modifying and recommending models --- The prices for a used Boonton, HP or other are now a bad choice and poor value. That was not the case a couple years ago. The QA400 now looks better than ever as the Go-To product for low cost, quick and easy measurement of basic audio distortion harmonics (FFT and THD), IMO.

I have Linear X products since day-one for acoustics measurements. Even went up to the head quarters and took their training course for 3 days. They are very comprehensive in features. Not easy to learn on your own. I would expect their new test instrument to be similar. Much more can been done with them and the price seems fair. But for just the basic FFT/THD test, the QA400 is the one.

THx-RNMarsh

Last edited by RNMarsh; 28th October 2014 at 01:48 AM.
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Old 28th October 2014, 04:51 PM   #9
danils is offline danils  Europe
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Hi RNMarsh and thank you for your feedback.

I went on the LinearX website and products related to LX700 result out of stock at the date of today

Also the website has a 1995-2004 despite we are in 2014.

I got a bad impression from the website. And the website is today the business card of every serious company, imo.

I am quite surpized they do not offer a serial audio output interface module for their mainframe.

So you confirm the products are good quality and they are still on business and supportive?
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Old 28th October 2014, 05:33 PM   #10
RNMarsh is offline RNMarsh  United States
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They are good quality. No idea if they are even still in business, though. Just a hell of a lot of bells and whistles in them to sort thru. versatile to a fault. Would have liked to see setups in advance for the common tests we all do. But it is buried so I gave up on it. No patience even after the course. Might be great for an advanced user in the field..... not a hobbyist. Now it sits in a shelf unused and lonely.

THx-RNMarsh

Last edited by RNMarsh; 28th October 2014 at 05:35 PM.
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