jbell's set of four tapped horns

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#481
Nope, stadiumhorn hasn't changed in all these years. It is still a GREAT cabinet, simple, easy, and loud at 40hz. Perfect for installs, not so great if you have to move them with over 150lbs just in plywood weight.

With the yorkville as your comparison -- the ss15 is the deal, it will match or exceed the yorkville in all but power handling. So to use the drivers you have -- SS15 is the cabinet I recommend you build.

StadiumHorn gives low
SS15 gives loud
 
#484
thanhdn9x said:
When I check in Hornresp, the Electrical Impedance is about 5.8ohm, so I check the 1w/1m is about 100db at 40hz, input voltage = 2.39V. Any wrong if I put 2,83v at input for 1w/1m?
Click to expand...
Nothing "wrong", amplifiers put out voltage, not watts.

The Re (DC resistance) of an Eminence 3015LF is 5.5 ohms on the spec sheet, the impedance in an enclosure will vary from near that as a minimum to 10 times (or more) than that.

For typical 1 watt 1 meter sensitivity specifications, the nominal (2, 4, 8, or 16 ohm) impedance is used, with a constant drive voltage that would result in one watt power into the driver at that impedance, 1.41 v applied to a "2 ohm" driver, 2v for "4 ohm", 2.83v for "8 ohm", 4v for "16 ohm".
 
#485
weltersys, what you pointed regarding sensitivity specifications is correct but what you said regarding ampplifier output isn't, so may I write proper definition:

Tecnically, amplifier put out Power.

Power is a relationship between Voltage and Current.

For AC system, the proper measurement for power should be VA (Volt-Amps) and it refer to Apparent Power because there is phase shift between Voltage em Current. Watts is just a measurement for the True part of the Power while the other part is known as Reactive Power (VAR).

The the image below for better illustration
the-power-triangle.png


In a ammplifier:
Voltage output will vary according to input signal
Current output will vary according to the voltage and loundspeaker impedance that vary with frequency
 
#486
weltersys said:
For typical 1 watt 1 meter sensitivity [/quote\

Sensitivity is measured with reference to volts, not watts 🙂. Specifically @2.83V/1M

Efficiency measurements are done with reference to watts / meter, and in that case it is assumed that the DUT is a simple resistance and it's driven by a source voltage that will result in 1 watt being dissipated by said resistance. Hence 2.83V for a 8-ohm rated speaker, etc.

For an 8-ohm rated speaker, the rated sensitivity and rated efficiency should be therefore be the same. It's no wonder that the terms get confused all the time.
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#487
Brian Steele said:
weltersys said:
For typical 1 watt 1 meter sensitivity [/quote\

Sensitivity is measured with reference to volts, not watts 🙂. Specifically @2.83V/1M

Efficiency measurements are done with reference to watts / meter, and in that case it is assumed that the DUT is a simple resistance and it's driven by a source voltage that will result in 1 watt being dissipated by said resistance. Hence 2.83V for a 8-ohm rated speaker, etc.

For an 8-ohm rated speaker, the rated sensitivity and rated efficiency should be therefore be the same. It's no wonder that the terms get confused all the time.
Click to expand...
SO in this case, I have to put ~2.35V for the Eg to see sim of the Efficiency?
When do measurement, I have to do the same, right?

Thanks😀😀
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