1w or 2.83v? Fs and response?

[Randy Bassinga]

Trying to get my head around driver datasheets

This one lists at 2.83v
https://www.wagneronline.com.au/attachments/Audio-Speakers-PA/sbacoustics/SB34SWPL76-3-DV.pdf

This one at 1w
https://ds18.com/collections/n-12-s...ohm-dvc-quad-stacked-magnets?view=sl-76453B29

How to line the efficiency up to even power to compare?

Also Fs and response, I see some that list frequency response starts around Fs and some that are a lot lower as in the second link with 16Hz on the lower side of response and 31Hz Fs

 

[Randy Bassinga]

Is this a case of SBA making the driver appear louder or is this normal to list at 2.83v?

 

[newvirus2008]

2.83V is same as 1W when the impedance is 8 ohms. However, when it's different, another term called sensitivity (dB/V) is used instead of efficiency (dB/W). This is primarilt because amplifiers (unless otherwise specified) are voltage sources.

 

[Randy Bassinga]

We are fortunate that the modelling software don't rely on manufacturers numbers for Sensitivity. Shoddy series and parallel, both done at 2.83v as in case of the SBA. The peak to peak xmax rating also appears to make it look huge when it's only half that

Calculating Vas using the known sensitivity number is useless with such datasheets

 

[weltersys]

We are fortunate that the modelling software don't rely on manufacturers numbers for Sensitivity. Shoddy series and parallel, both done at 2.83v as in case of the SBA.

The spec sheet clearly states the one meter sensitivity at the voltage applied to the dual voice coils:

2.83v into 1.5 ohms nominal (parallel) is 5.3 watts (90dB), 2.83v into 6 ohms nominal (series) is 1.33 watts (85dB).

If they stated 1watt sensitivity, 1.225v (square root of 1.5 ohms) would have been used for parallel, and 2.5v (square root of 6 ohms) for series.

The peak to peak xmax rating also appears to make it look huge when it's only half that

The spec sheet clearly states linear coil travel as peak to peak:

With the voice coil and gap height listed easy to see this is a real, 38-8=30mm.
Since the definition of Xmax is linear coil travel one way, simply divide 30/2=15.

As far as the DS18 specs, who knows...

 

[BP1Fanatic]

Yeah, DS18 is questionable with their specs.

 

[Randy Bassinga]

You know, just buying the drivers on impulse was easier. Scrutinising datasheets is a jumble of real estate ads

The DATSv3 is going to get a workout

 

[witwald]

This one lists at 2.83v
https://www.wagneronline.com.au/attachments/Audio-Speakers-PA/sbacoustics/SB34SWPL76-3-DV.pdf

This one at 1w
https://ds18.com/collections/n-12-s...ohm-dvc-quad-stacked-magnets?view=sl-76453B29

How to line the efficiency up to even power to compare?

The 1W/1m measurement is likely to be 2.83V/1m, with the "1W" actually being referenced to an 8-ohm resistor.