Peerless 850489 4.5" Shielded Phase Plug Speaker HDS134 6.5" Mid-Woofer Bass

Description

Peerless 850489 4.5"
Shielded
Phase Plug Speaker HDS134 6.5" Mid-Woofer Bass Driver
Made in Denmark
Installed in a cabinet  many years ago and was never used.  Shows minor evidence of being mounted on back of frame. Tests perfectly.
At time of listing, (2) are available.  See separate listing for Non-shielded version.
Mounting holes are 5.5"
Requires 2-7/8" depth.
WOOFER/MID 6½" - HDS 182 - 182 WR 33 102 SD AL PH LS 8 ohm A High End mid-woofer with a rigid aerodynamic cast aluminium basket profile and a ventilated spider. The static phase plug eliminates air compression between the dust cap and the magnet assembly. This phase plug feature also gives the driver a very low distortion magnet system and with the aluminium shortening ring and copper capped pole piece, both contribute as heatsinks for the large 26mm voice coil, reducing power compression and give a more linear flux field for the voice coil to work in thus increasing this drivers performance to optimum levels. The three or five layer sandwich cone improves accuracy and consistency of sound reproduction over the entire frequency range, creating a more "musical" driver. The double bonded cone, cap and coil assembly ensures that the speaker cone will respond to every coil movement in a way never achieved before, reducing cone break-up, increasing response, and performance especially at high volume levels. This premium mid-woofer uses an abundance of Peerless' experience and resources to produce an exceptionally refined driver. Peerless recommend a ported box volume of between 15 to 25 litres and parallel configurations for larger boxes Peerless recommend a ported box volume of between 15 to 25 litres and parallel configurations for larger boxes.
F(ratio) for this driver is t .
25 ltr box. 1 port. Diameter 70 mm. Length 145 mm. Tuning freq 45 Hz. Response, - 3 dB app. at 48 Hz.
25 ltr box. 1 port. Diameter 55 mm. Length 80 mm. Tuning freq 45 Hz. Response, - 3 dB app. at 48 Hz.
15 ltr box. 1 port. Diameter 55 mm. Length 110 mm. Tuning freq 52 Hz. Response, - 3 dB app. at 55 Hz.
15 ltr box. 1 port. Diameter 40 mm. Length 50 mm. Tuning freq 52 Hz . Response, - 3 dB app. at 55 Hz.
Parameters Free Air Common Baffled Code 850489 102, and he driver is very suitable for vented boxes
Nominal impedance Zn (ohm) 8
Minimum impedance/at freq. Zmin (ohm/Hz) 8.6/335
Maximum impedance Zo (ohm) 42.9
DC resistance Re (ohm) 5.8
Voice coil inductance Le (mH) 1.0
Capacitor in series with 8 ohm (for impedance compensation) Cc (µF) 8
Resonance Frequency fs (Hz) 53.2 52.2 Mechanical Q factor Qms 2.83 2.88
Electrical Q factor Qes 0.44 0.45
Total Q factor Qts 0.38 0.39
F (Ratio fs/Qts) F (Hz) 133
Mechanical resistance Rms (Kg/s) 1.23
Moving mass Mms (g) 10.4 10.8
Suspension compliance Cms (mm/N) 0.86
Effective cone diameter D (cm) 10.5
Effective piston area Sd (cm²) 86
Equivalent volume VAS (ltrs) 8.8
Force factor Bl (N/A) 6.8
Reference voltage sensitivity
Re 2.83V 1m at 259 Hz (Measured) (dB) 87.9
Voice coil diameter d (mm) 26
Voice coil length h (mm) 13
Voice coil layers n 2
Height of the gap hg (mm) 6
Diameter of magnet dm (mm) 90
Height of magnet hm (mm) 15
Weight of magnet (kg) 0.4