Great Plains Audio 515-8LF GPA

15" · 8 Ω · 125 W · 98.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	27.4 Hz
Qts	0.255
Qes	0.261
Qms	11.63
Vas	470.1 L
Sd	856 cm²
Xmax	5.1 mm
Re	6.7 Ω
Bl	18.1 T·m
Mms	73.7 g
Pe	125 W
Sensitivity	98.4 dB

Alignment hint

EBP	105 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 70.3 L

EBP > 100: favours a ported (bass-reflex) alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
Altec 515-8LF	27.4 =	0.255 =	470.1 =	5.1 =	98.4 =	close		+
Supravox 400 GN-B	28.5 +1.1	0.272 +0.02	450 -20.1	5 -0.1	98.6 +0.2	close	Xmax 5 mm < 5.1 mm: lower excursion-limited SPL	+
Iconic Speakers 704-8A	30.9 +3.5	0.262 +0.01	463 -7.1	5.1 =	99.7 +1.3	close		+
Supravox 400 EXC Ag 13V	25.3 -2.1	0.253 =	555.6 +85.5	5 -0.1	98.7 +0.3	close	Xmax 5 mm < 5.1 mm: lower excursion-limited SPL	+
Visaton WS40NG	25 -2.4	0.252 =	500 +29.9	6.5 +1.4	97.1 -1.3	close		+
Audio Dynamique AD380PM100	25.5 -1.9	0.26 +0.01	530 +59.9	5 -0.1	97 -1.4	close	Xmax 5 mm < 5.1 mm: lower excursion-limited SPL	+
Supravox 400-2000EXC_13V	25 -2.4	0.236 -0.02	438 -32.1	5 -0.1	97.4 -1	close	Xmax 5 mm < 5.1 mm: lower excursion-limited SPL	+
Crites Speakers CW1526	26.3 -1.1	0.263 +0.01	506.3 +36.2	7 +1.9	101.1 +2.7	close	4 Ω vs 8 Ω: amp load changes	+
Crites Speakers CW1526C	26.3 -1.1	0.263 +0.01	506.3 +36.2	7 +1.9	101.1 +2.7	close	4 Ω vs 8 Ω: amp load changes	+
Usher Audio 15HM Studio	27 -0.4	0.28 +0.03	385 -85.1	5.9 +0.8	98 -0.4	close		+

Compare the closest 3 against the 515-8LF GPA →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.