Strain gauge vs Zyx 4D/Atmos

Hi Raul,

I must point out that the Win Labs never produced a flat frequency response-- please have a look at some magazine test reports.

I own(ed) the Panasonic, and in the Jeff Rowland strain gauge preamp for it, Jeff applied a very mild amount of mid-band EQ to make the output 'flat'. And it was. I owned the stock cartridge, but my favorite was the boron cantilever version with a vandenHul stylus.

And then there is the Soundsmith Strain Gauge-- it also employs a touch of midband EQ, and definitely measures flat in my experience.

Raul, can you please show us what information or test that you found to show this 2dB frequency-response irregularity please?

Everyone should know that the frequency response of any cartridge depends on the brand of test record used-- CBS, and JVC being the most common. There is quite a difference in their highs. Have a look at USA magazine tests from the 1970's to see the difference, as some publications used both test records.

Obviously both CBS's and JVC's top engineers believe they each produce a reference-standard test LP. Yet this means only that there is no ABSOLUTE standard for which to MEASURE any cartridges using a test LP.

However, there is a way to measure the response of a test disc itself without playing it, by looking at how each modulated groove reflects white light, as the sine-wave signal is slowly swept from 20 to 20k Hz. This is pictured and described in my 1978 copy of the Audio Cyclopedia. I do not remember the mathematics involved, but this was a very useful and accurate technique according to that text.

Of course, it helps that Peter at Soundsmith has his own disc cutting machine. I know he has created his own test records containing impulses and other test-signals not available on commercial test discs.

And why would an already-renowned cartridge designer create his flagship cartridge with such a frequency-response error, one which anyone would discover? Makes no sense.

Best regards,
Roy Johnson
Green Mountain Audio

Dear Royj: This can shows you that the SS does not mimic the RIAA as you are assuming ( see those magazyne pictures. ):

http://www.sound-smith.com/cartridges/article.pdf

and here MR. Lendermann told us about that deviation level:

+++++ " I have measured the SG in many arms, and recently in my Schroder Reference SG, the new SG design (which you did not hear) it was +/- 1dB from 50 Hz to 12K " +++++

weird on the frequency range, he does not given how the ss performs between 20hz to 50hz and between 12khz and 20khz.

Royj, I'm not against the SS device and obviously not against Mr. Ledermann: I'm only share my findings about, that's all. Why that so " big distress ", that's not my opinion ( I reserve to me that opinion. ) are only facts coming from other " sources " ( SS site and Mr. Ledermann. ) but me.

Why Mr. Ledermann and other persons try to blame me for something that's not my opinion?, makes no sense.

Regards and enjoy the music,
R.

Raul,

I appreciate your concern. That magazine test gave no scale at all to their Figure 4. Also, on their page four, their author states, "We can now state, with an excellent accuracy level, that the natural frequency response curve of the SOUNDSMITH cartridge is equal to the RIAA curve,"

I think it will help if I share some facts that make more sense of this whole issue:

-- Top-line cartridges producing a +/- 1dB deviation between 50 and 12kHz are not uncommon (note how few manufacturers even publish response curves anymore).

-- Measurements below 50Hz change with a turntable's construction and its tonearm's effective mass.

-- Measurements above 12kHz depend on the test disc chosen. Which test LP is accurate? How about none.

-- 50 to 12kHz is exactly the range in which Stanton 'calibrated' their 681EEE. So did Empire and Pickering as I recall.

-- A cartridge claiming +/- 0.5 dB variation cannot be verified nor duplicated outside the factory because of the different turntable, tonearm, headshell, platter mat, cables, cartridge alignment, and test record employed.

-- These test records use steady sine waves, which indicate little about the dynamic response of the cartridge and nothing about phase accuracy- both far more important in my and many other's professional opinions. Example, how many times do we comment on the "lighter sound" of certain phono cartridges which we know to 'measure flat'? Heck, they even come with a graph.

In summary, all of the above certainly shows simple measurements/tests are at best only a guide, especially when the test signals do not simulate much about music. Furthermore, we lack the ability to reproduce any +/-0.5dB variation claimed.

Finally, in my experience also as a transducer-design specialist, a smooth +/- 1dB variation in response from 50Hz to 12kHz is never the reason someone "doesn't like the sound". That sound is not being enjoyed for many other reasons-- not from that cartridge having a +/- 1dB spec in that range instead of +/- 0.5dB.

By the way, I don't know which commercial music-LP could be chosen for someone to say "I can hear this phono cartridge has a perfectly flat frequency response."

If you did not like the Soundsmith Strain Gauge, either it was not well-setup or its sound was just not your cup of tea, as Peter wrote does happen. What you heard cannot be laid at the feet of a +/-1dB response in my professional experience.

As a side note, I hope we all can agree that passing the 1812 LP's torture track is no indication of a cartridge's musicality.

Best regards,
Roy

Dear Royj: I don't know what kind of cartridges are you accustom to hear or like it but the ones I like almost all are dead flat, you can take the EPC100CMK4 frequency response diagram and you can't see/detect any minimal deviation ( not even 0.1db. ) from flat.

+,- 1 db means a 2db swing. I can understand that this kind of performance level achieve your targets but certainly not mines.

++++ " SOUNDSMITH cartridge is equal to the RIAA curve " +++++

this is a non-sense an IMHO almost a stupid statement against evidence on that pictures.

+++++ " If you did not like the Soundsmith Strain Gauge " +++++

where do you read that statement?, please don't infere what could be or not my opinion on preference.

+++++ " As a side note, I hope we all can agree that passing the 1812 LP's torture track is no indication of a cartridge's musicality. " +++++

musicality?, where I heard that " term "? oh yes, an audiophile term that means colored/distorted performer aways from accuracy/neutrality. I don't use that term any more for very good reasons.

Yes, the Telarc 1812 could tell us several things, between others if the cartridge always stay in full touch with the grooves ( at microscopic level. ). A cartridge that pass this music recording normally has low very low tracking distortion that the ones that did not and lower tracking distortions means IMHO more MUSIC and less colorations. It is a lot better to have a cartridge that always is in the groove that other cartridge that are " jumping " ( again: microscopic level. ) in between because poor tracking habilities. No contest here between one and the other. IMHO the better the cartridge tracking habilities ( everything the same. ) the better quality performance.

Low cartridge traking distortion is one main cartridge design desired characteristic and of course that this characteristic per se can't tell us if we will like it or not during playback.
Poor tracking cartridge habilities perhaps is the factor that makes more harm to what we hear in a cartridge, problem is that almost no one but the designer cares about and I can see that you don't care enough and nothing wrong with that.

I don't where do you want to arrive? or why are you questioning me? why not question to that magazyne or SS people?. I'm just an audio customer and an Agoner that like to share its findings/experiences as any other person in this and other internet forums.

Btw, my opinion is as valid as yours nothing less and nothing more.

Regards and enjoy the music,
R.

I don't see.