Peerless_HDS205_850490.pdf

850490

8" HDS CAST ALLOY BASKET

HDS 205 - 205 WR 33 102 SD 4L AL 8 ohm

A High End woofer with rigid aerodynamic cast aluminium basket profile and ventilated spider. The basket provides

the necessary sturdy base for the magnet structure and suspension and allows for long excursion of the cone. The spider

is ventilated to achieve the lowest possible compression and to allow air to flow freely to create a cooling effect for the

voice coil. The design of the basket front allows for very slim box designs and the edges are cambered to re-duce the

necessary amount of counter sinking. The three or five layer sandwich cone improves accuracy and consistency of

sound reproduction over the entire frequency range, creating a more "musical" driver. Other features are powerful bass

response, high sensitivity, gold plated terminals and very low harmonic and difference tone distortion. This woofer is

applicable on a wide range of applications, and has large flexibility in terms of chassis colour and cone material.

"F(ratio) for this driver is and the driver is very suitable for .

35 ltr box. 1 port. Diameter 70 mm. Length 75 mm. Tuning freq 50 Hz. Response, - 3 dB app. at 50 Hz.

55 ltr box. 1 port. Diameter 70 mm. Length 50 mm. Tuning freq 45 Hz. Response, - 3 dB app. at 45 Hz.

70 ltr box. 1 port. Diameter 70 mm. Length 50 mm. Tuning freq 40 Hz. Response, - 3 dB app. at 40 Hz.

Cross-over freq from 1500-3000 Hz is recommendable for this model."

102,

vented boxes

Thiele Small parameters:

Free air Common Baffled

Nominal impedance

(ohm)

Minimum impedance/at freq. Zmin (ohm/Hz)

6.5/224

Maximum impedance

(ohm)

62.2

DC resistance

(ohm)

5.7

Voice coil inductance

(mH)

1.8

Capacitor in series with 8 ohm

(for impedance compensation) Cc

(µF)

Resonance Frequency

(Hz)

30.1

29.1

Mechanical Q factor

Qms

3.02

3.13

Electrical Q factor

Qes

0.30

0.31

Total Q factor

Qts

0.28

0.29

F (Ratio fs/Qts)

(Hz)

102

Mechanical resistance

Rms (Kg/s)

1.74

Moving mass

Mms (g)

27.8

29.8

Suspension compliance

Cms (mm/N)

1.01

Effective cone diameter

(cm)

17.3

Effective piston area

(cm²)

235

Equivalent volume

VAS (ltrs)

76.7

Force factor

(N/A)

9.9

Reference voltage sensitivity

Re 2.83V 1m at 224 Hz (Measured) (dB)

91.2

Voice coil diameter

(mm)

Voice coil length

(mm)

Voice coil layers n

Flux density in gap

(T)

1.01

Total useful flux

(mWb)

0.99

Height of the gap

(mm)

Diameter of magnet

(mm)

102

Height of magnet

(mm)

Weight of magnet

(kg)

0.68

Code

850490

Page 1/2

Peerless Recommend:

850490

8" HDS-205 CAST ALLOY BASKET

225mm

90mm

By introducing the High Definition Sound (HDS) class, Peerless hav

pushed the performance limits of midbass drive units to a new level.

The main applications for the HDS range are demanding two and three

way box systems where the visual and sonic performance must be second

to none. The design emphasis has been to achieve long time reliability and

very low distortion combined with soft clipping and astounding bass

performance for the size.

The 1.25-inch voice coil is long in a narrow gap to ensure sustained BL

over long excursions. The 20mm Magnet System is at least 5mm higher

than the normal magnets used in conventional speakers to accommodate

the long, 4 layer voice coil. The progressive suspension is designed to

achieve soft clipping and low distortion even under extreme load. The

surround is made from SBR rubber because of the wide operating

temperature, low creep and long term reliability. The cone is constructed

from a propriety cone material using a laminate of different polypropylene

films and adhesives. This creates a stiff but still dampened cone that will

remain stable even under very large sound pressures. The attractive rigid

cast basket with an aerodynamic profile provides the necessary sturdy

base for the magnet structure and suspension and allows for the long

excursion of the cone. The spider is ventilated to achieve the lowest

possible compression and allowing air to flow freely to create a cooling

effect for the voice coil. The design of the basket front allows for very

slim box designs and the edges are chamfered to reduce the necessary

amount of countersinking.

Below are some theoretical projections of how well this driver will

perform in a ported box design. Useable bass of below 30Hz is quite

achievable and as low as 25 to 20Hz with a bit of port tuning. Peerless

have suggested box volumes of between 35 and 70 liters for this model,

the larger the box, the deeper the bass.

The tweeter crossover should be kept between 1500 and 3000Hz. If

designing a three way system then the crossover depends on the midrange

driver.A power rating is not given for this driver because you will exceed the

drivers maximum physical parameters before its electrical. The graphs show

200W as this is the maximum excursion for this driver to produce this SPL in

this fictitious box. If the driver "bottoms out" prematurely (voice coil hitting

the magnet), try changing the tuning port length or even the box size (and

therefor the box tuning frequency).

4.5mmØ

Below are some theoretical calculations for crossover design. Peerless always

recommend 12 dB per octave crossovers for all there drivers because it affords

excellent protection for each driver with minimal phase problems. The design

below also accommodates Bi-wiring/Amping. However they stress that this by no

means is the best solution for all circumstances. So please use this as a suggestion

only. 3 way designs with the 821615 midrange are also worthy of your

consideration. Multiple driver designs will produce more bass and SPL.

- 3rd order Butterworth calculated with rated impedance (used 811827

tweeter) including conjugate. Values can be rounded +/- 10%. Use of multiple

capacitors to achieve these odd values is fine.

C1 = 8.11uF

C2 = 24.35uF

C3 = 14.36uF

L1 = 0.25mH

L2 = 0.56mH

L3 = 0.19mH

R = 7.4ohm

C = 47.8uF

Page 2/2

2500Hz

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