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Where the figures for HDN-8 come from

I take every figure from Dayton Audio's own product page or datasheet where I can. This lists where each figure on the HDN-8 page came from.

• 11 from Dayton Audio's product page
• 1 worked out from Dayton Audio's figures
• 6 not yet checked
• 2 from NB Audio's listing

General

Driver type	Exciter	NB Audio's listing
Nominal impedance	8Ω	Maker's product page
Series	Tactile	NB Audio's listing
Power handling (RMS)	50 W	Maker's product page
Power handling (program)	100 W	Maker's product page
Frequency range	40 – 15,000 Hz	Maker's product page
Size	4"	My earlier listing, not yet checked

Thiele/Small parameters

Resonant frequency (Fs)	695 Hz	Maker's product page
DC resistance (Re)	7.46 Ω	Maker's product page
Voice coil inductance (Le)	0.86 mH	Maker's product page
Total Q (Qts)	1.52	Maker's product page
Compliance (Cms)	0.001373 mm/N	Worked out from the maker's figures
Moving mass (Mms)	38.2 g	Maker's product page
Force factor (Bl)	18.2 T·m	Maker's product page

Motor

Magnet weight	1 kg	My earlier listing, not yet checked

Mounting

Mounting depth	44 mm	My earlier listing, not yet checked
Voice coil diameter	50 mm	Maker's product page
Width	102 mm	My earlier listing, not yet checked
Diameter	101 mm	My earlier listing, not yet checked
Dimensions	35 × 102 mm Ø	My earlier listing, not yet checked

Not on file: Vas, Sd, Xmax, Sensitivity, Outside diameter, Cutout, Bolt circle, Flange thickness, Weight. Either the maker doesn't publish it or I haven't found it yet.

What the labels mean

• Maker's product page: copied from the maker's product page.
• Worked out from the maker's figures: Vd = Sd × Xmax, EBP = Fs ÷ Qes.
• My earlier listing, not yet checked: from the listing I had before I started checking figures against makers. Treat it as a guide until it's checked.
• NB Audio's listing: how I've filed it in the store.

Check them yourself: Dayton Audio HDN-8 Specification Sheet