Speaker Sensitivity: Advertised vs Measured

[carlosmante]

What would you suggest?

"Stacked bar chart" . .https://chartio.com/learn/charts/stacked-bar-chart-complete-guide/

 

[sonwowo]

Andrew Jones Elac speaker is pretty good. I bought Dbr62 this time and I like it very much.

 

[MZKM]

"Stacked bar chart" . .https://chartio.com/learn/charts/stacked-bar-chart-complete-guide/

A stacked bar graph is for showing a total amount of something divided up into subgroups (demographics, expenses, etc.).

It isn't as easy to see the small differences, and I can't figure out how to display when the measured is above the spec (I can't stack the totals, only sums, so for the below graph the I had to use the difference in SPL as the value for one of them).

I can do a 100% stack, but then you don't know the SPL values unless you hover over each individual one:

 

[Karu]

If there was/is a similar metric for speaker impedance, that would be great to see as well, giving a better sense of true complementing amplification needs. Edit: as in restorer-john’s earlier post

 

[maty]

Klippel at 1 m?

Traditional measurements -> almost 85 dB.

 

[MZKM]

If there was/is a similar metric for speaker impedance, that would be great to see as well, giving a better sense of true complementing amplification needs. Edit: as in restorer-john’s earlier post

Amir posts these as graphs, no data points, so I can’t analyze them.

Also, I don’t think there is any real standard for calculating impedance. I know Andrew Jones has stated he uses some body‘s recommendation of the minimum impedance being 80% the nominal, so you calculate the minimum, multiply by 1.25, then round to nearest integer.

 

[MZKM]

Klippel at 1 m?

Traditional measurements -> almost 85 dB.

Not sure of your question, the Klippel reports it’s measurements at 2.83V at 1m.

 

[VintageFlanker]

Plaudits to @MZKM, that's very precious!

Would be glad to see: "Impedance: Advertised Vs Lowest/highest measured" one day.

 

[Berwhale]

What would you suggest?

It should be a scatter chart with error bars. Using a line chart is incorrect because the x axis consists of categories rather than a continuous range of values.

 

[MZKM]

It should be a scatter chart with error bars. Using a line chart is incorrect because the x axis consists of categories rather than a continuous range of values.

I get what you mean about it not being a continuous range, I chose not to do that as it isn’t as easy to see the differences compared to the line chart, though I could be swayed. Error bars are for +/- values, which isn’t what we have here.

 

[jeffbook]

What would you suggest?

Try a column graph. Places the values side by side.

 

[MZKM]

Try a column graph. Places the values side by side.

Way too busy and not as easy to read:

The best alternative I see is a column+area chart:

 

[Robbo99999]

Looks like there aren't many issues here apart from Klipsch, poor Klipsch!

 

[Berwhale]

Error bars are for +/- values, which isn’t what we have hear.

It's exactly what we have here, all the errors just happen to be the same sign.

 

[Milesian]

Explains why my Klipsch RP600M were disappointing with my 2A3 amplifier. Glad I sold them.

 

[Xulonn]

Explains why my Klipsch RP600M were disappointing with my 2A3 amplifier. Glad I sold them.

However, my Tektron 2A3 SET amp with 2.5wpc drove my Kipsch Forte II's in a large, high-ceiling living room cleanly to quite loud levels

 

[ta240]

It should also be noted that achieviing higher linearity can result in a overall lower sensitivity. This can be a design choice in products such as Klipsch where a flatter response may be sacrificed to achieve a higher sensitivity rating

But if they sacrificed flatter response they didn't get higher sensitivity. I wonder what they got instead? Better crops, clear skin?

 

[Audioagnostic]

What would you suggest?

A Line suggests a linear relation between the points on the horizontal Axis. These are discrete events and therefore a line is a bit misleading.

You could plot the data on an X Y grid. X Axis measured sensitivity, Y Axis advertised sensitivity. This way most speakers will hover around the 45 degree angle and Klipsch is clearly identified as outlier. (Edit to make clear that you Will het a graph in which deviations from the line show misleading info)
There are many options though.
Your bar graph is also fine...

 

[kevinh]

I wish I had some good data on the various ESL's I've owned. Acoustats claimed like Soundlabs to be 88 db/watt/meter. In fact I'd say more like 78 or 80 is for real with a heavy lean toward 78 db.

Stereophile did measure 101 db/2.83v/meter which was lower than the claimed 105 db for the K-horns, but still awfully high.

Tough to do, Roger West said the SPL fell off by 1/r from a large format panel, rather that 1/r*r with a dynamic 'point source' speaker.

 

[Xulonn]

Considering all of the options, I like the bar + area best. Not the most elegant looking, but it shows everything in the data at first glance.