AvsB: Max. Acoustic Output? - diyAudio
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Old 26th November 2011, 08:06 PM   #1
ro9397 is offline ro9397  United States
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Join Date: Jan 2007
Location: No. Utah
Thumbs up AvsB: Max. Acoustic Output?

AvsB: Maximum Acoustic Output

I employ a distributed sub array with four 10” that is clean, transparent and exhibits no proximity effect crossed @ 135 Hz (active LP crossover, presumably 4th order but not positive).

Main speakers employ the following dual-pole line-level high-pass crossover:
1st order @ 2.2 kHz
3rd order @ 80 Hz
Per my math, relative to 2.2 kHz, the above crossover yields -32 dB @ 80 Hz, -68 dB @ 20 Hz. I can only presume the resulting proper tonal balance relates to the room’s acoustics + the response of the mid-bass employed: one per channel Dynaudio 17WLQ Esotec 8-Ohm 17cm, refer to "8-Ohm" (not 4-Ohm) datasheet HERE (crosses to a dome tweeter @ 2.2 kHz).

I consider replacing the single 17WLQ with four 5cm square full-range drivers with these specs:

Parameter Description Min Typical Max Units
Re DC resistance 10% 7.9 +10% Ohms
Le Inductance -10% 0.137 +10% mH
BL Force factor 3.87 Tm
fs Resonance frequency -20% 148 +20% Hz
dDrv Voice coil diameter 25.4 mm
Mms Moving mass 1.68 g
Cms Compliance 0.70 mm N-1
Rms Suspension Loss 0.49 Ns m-1
Sd Radiating Area 17.2 cm2
Xmax Maximum coil excursion (p-p) 7.0 mm
Sd Effective piston area 17.2 cm2
VAS Equivalent volume 0.29 L
Qms Mechanical quality factor 3.18
Qes Electrical quality factor 0.83
Qts Total quality factor 0.66
Sens Sensitivity 83 dB/W/M

5cm Test Conditions Value
Continuous power handling (weighted pink noise) 12W (TBC)
Burst power handling (weighted pink noise) >24W (TBC)
Operating temperature range -20 to 55° C
Audio frequency range 80Hz to 20kHz (these values likely inflated)


Sensitivities

One 17WLQ mid-bass: 86 dB
Four 5cm square full-range: 89 dB

Suppose maximum power of the associated amp exceeds driver power handling. From about 150-2.2 kHz, with the above described line-level filters, how does maximum acoustic output compare, one 17WLQ vs. four 5cm? The 5cm FR graph is flat over to over 10 kHz (I intend to cross it around 6 kHz to a planar magnetic tweeter).

TIA!
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