cart measurement vs quoted spec


Hi,
I'm a bit puzzled by some cart measurements performed with the ACOUSTECH test record, using HP oscilloscope and using (differential connection) through ML 326S phono-modules.

No loading (47k), measured on XLR pre-outputs. The following transpired:
Left vs. Right = *- 2dB* @ 1kHz 7cm/s lateral (mono track), *spec = <0,2dB!*
Left vs. Right = on 1kHz 7cm/s vertical out of phase track, clearly NOT EVEN CLOSE to out of phase!
1 kHz left channel only *- 16dB* leakage to right! *Spec = >28dB @ 1 kHz!*
1 kHz right channel only *-10dB* leakage to left! *Spec = >28dB @ 1 kHz!*

This seems a most disappointing showing indeed. Let me hasten to say that all variations with regards to anti-skate, VTA, VTF, Azimuth and Zenith, were attempted for any optimisation.

I shall not yet disclose the make, which is a VERY well known brand, and their TOP of the range offering.

Has any one got some explanation for how such a major variation can be the case?!

There might just be some folks out there trying there darntest by NEVER getting their apparent alignment problem fixed, please note the various threads, ---- and it might be a cart way out of quoted tolerance?

I have also noted that in this instance, MAJOR Azimuth (+/- 2 deg), VTA, VTF, changes had absolutely MINOR measured effects!
The 'biggest' in this case was 'Zenith' by some 0.5mm left turn to compensate for a 'minor' out of centre cantilever (~ 0.25mm off-set to the left).

Tonality and such is NOT really affected, BUT distortion with massed instruments/orchestra etc. i.e. as soon as things get 'busy' the problems start.

Greetings,
Axel
axelwahl
Unless you guys include a notch filter to attenuate frequencies above/below the test tone, you're wasting your time using a multi-meter.

Surface noise, intra-vinyl resonances and warp wow will muddy the signal you're trying to measure with random noise. That's why Glai's measurements were "fluctuating" (aside from the washing machine).

Been there, did that...
Oh! So now you show up with the answer! Thanks Doug. :-) Now we know why Wally was charging what he does/did for the Analog Shop(?).

Yes, there was something about all of this that didn't quite add up in my head. See what 15 years of working in the software lab instead of the hardware lab can do to your skill set. I think that for AZ not having the filter isn't such a big deal as you can still get very close, then finish by ear. As you well know. ;-)
I like watchin' ya'll suffer fer a bit. Drives the lesson home!

Wally's price musta bin based on the cost o' them filters. It shore weren't based on the quality of th' box or th' terminals. One of 'em darn near gouged up a connector on a $3K pair of speaker cables. We had to file a big spur off'n it.
Howdy guys,
as long as you're have some fun here, I say.

Now my few pennies if you don't mind.
Glai says:
>>> ... or QC is very good. ...Same goes for airtight and Lyra <<<

Now guess WHAT? I put in my consultant's stock Lyra Dorian. NO sibilants, no massed instruments distortion, sailing through the most difficult of my tracks.
For an answers --- see Glai's comment.

I think Doug, who wants us to suffer is doing real good... I had that Windfeld (yes, OK) out, it goes back to the factory. Looking from below it looks VERY much more off then I realised checking from the front. Yes, Doug was right to suggest to trash it, and get a life, hm :-)

Next please, Dan_ed,
you say:
>>> When I use my DMM on MAX for example... <<<
Dear Sir, you must READ my statements properly and sink them in. I AM USING A SCOPE! This multi-meter measurement stuff sux, period.
On a scope you can see what going on, like noise etc. but not every one has one to play with as I mentioned also. So I'm lucky in this regard.
Next, there is NO household appliance running when I measure, period.
I also have a SEPERATE, audio only, circuit from the distribution box --- I'm told that helps :-)

So in closing, I'll have some follow up measurements comming on, with SCOPE and EVERYTHING the same as the Windfeld exercise was done, but now on a Lyra Dorian. J.C. beware :-) The cart is already set-up and running in my rig.

If we screwed up I'll also tell you, and also if we know why --- if we did (actually I'm confident we didn't). Ortofon recalled the cart, and I hope we get to some amicable agreement. If not, we'll see what to do next.

Thank you for your lively interest in this subject and it may yet prove to be of more educational value also, if Doug comes out of his corner and stops smirking at us.

Greetings,
Axel
I'd rather stay in my corner. With the extra bass loading it really rocks in here! Also, it makes it easy for your slings and arrows to find me. ;-)

Glad things are sounding better. :-)