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[Mike Christy]

Hi Art, Agree, not flat to 20, but it seems to have a more legs above 10khz, and is congruent to my QRx212 plots, a lounge favorite.

Take Care, and respectfully,
Mike

[Art Welter]

TrevorMilburn wrote on Tue, 18 January 2011 16:16

Quote: Could be a driver, crossover, processor setting, or microphone issue. If the other speakers you guys tested measured OK, I myself would start looking at driver/crossover issues on the JTRs, or, as I alluded to earlier, the location of the mid/high driver. The results seem to be completely at odds with those of other testers (HT & high-end hi-fi) that I have seen who generally sing the praises of the fidelity of JTR products. I know I have worked with brand new equipment,AV/Computing etc. sometimes from manufacturers renowned for their stringent quality control, which has presented strange problems, not always immediately detectable to the naked ear/eye, due to manufacturing faults or other damage such by transportation is totally at odds with the usual production-run models. However, one has to accept that items sent out specifically for testing should be checked with extra vigilance before despatch simply to avoid such problems - IMHO testers should report their findings to the manufacturer/dealer/importer before publishing just in case a rogue example has slipped past the post-assembly/despatch checks even if only to avoid embarrassment and with the hope that future quality checks are changed and/or improved. I for one would much rather see a reference to such problems as an addendum to a review along with a response from the manufacturer stating what the problem was and what steps were being taken to prevent further such problems than read a belated, often grovelling response, after a review as been published and remarked/commented on by many of the reviewed equipment's target audience/prospective buyers when damage has already been done. Just my 2 Cents worth (Oh, and I have trained as an ISO/9000 quality auditor)

When a speaker manufacturer states a specification, yet provides no chart of the specification, the specification is suspect to start with, IMHO.

When a pair of independent tests as above show similar results showing products that don’t come close to a claimed specification (20K at -3 dB), IMHO the burden of proof is on the manufacturer to provide a frequency response chart supporting their claim.

[Steve Hurt]

Jeff Permanian wrote on Mon, 10 January 2011 10:17

Also, I'm in the process of making grills for the Orbit Shifter. Jeff

Awesome!  

I know that grilles aren't cheap when they're half the size of a refrigerator, lol, but grilles will really class up the look of the Orbit Shifters.  Good move!

[Robert Patch]

Here is the measurement position for the 12x.

[Mike Christy]

I think maybe a straighter back, and hands more on the hips, would give better results...

[Art Welter]

Robert Patch wrote on Thu, 20 January 2011 13:09

Here is the measurement position for the 12x.

The measurement position is not nearly on axis to the HF horn on the cabinet's right side, so a rolled off HF result would be expected as observed.

A tall cabinet measured in the horizontal position laying on the ground is not a valid test for on axis response in normal use. The positioning of the microphone so close makes the test worse.

The response of a HF horn near a boundary is not indicative of  it’s response in the air, nor will the response of a  mid cone coupled to the ground be indicative of the response in air.

Measurements and EQ settings arrived at from a test with the microphone and a full range cabinet in the position shown are of little practical use.

Art Welter

[Ivan Beaver]

Robert Patch wrote on Thu, 20 January 2011 15:09

Here is the measurement position for the 12x.

I would suspect that the board or whatever the mic is on is affecting the HF response somewhat.

You really need to be using something smooth and larger.  I use a 2x2' mirror.  Nice and smooth and large enough so the transistion freq  to the floor will be better.

Welcome to "measurement world".  

Getting accurate measurements is not as easy as it may seem.

Sure you can get "something" but is it correct?

[Jeff Permanian]

I'm planning on having third party measurements on all my speakers this year and will have ease and clf data.

Triple 12-PRO in the air:

[Jeff Permanian]

+2010 Growler:

I pulled down the 135hz peak a few db but then also pulled down 100hz a little in the process.

[Jeff Permanian]

Orbit Shifter:

2 watt so minus 3db for a 1 watt