Name: SB Acoustics SB21RDC-C000-4 Tweeter
Brand: SB Acoustics
SKU: SB21RDC-C000-4
Price: 36.55 GBP
Availability: InStock
Rating: 5.0 (1 reviews)

UK STOCK ITEM - EXCELLENT REPLACEMENT FOR VIFA / PEERLESS XT19TD00-04.

The SB21RDC-C000-4 by SB Acoustics is a 21mm ring radiator tweeter. The centre of the diaphragm is inverted and bonded to an internal dimple on the pole piece, this innovation negates the need for a front phase plug and gives excellent extension to above 20kHz.

Key Features:

Inverted centre phase plug free design
Non-resonant diaphragm design for minimum high frequency break-up
Dual balanced compression chamber for improved dynamics
Copper capped pole for reduced voice coil inductance and minimum phase shift
Saturation controlled motor system for low distortion
Non-reflective rear chamber with optimised damping for improved dynamics
Flow optimised vented pole piece for optimum coupling to rear chamber
CCAW voice coil for low moving mass
Long life silver lead wires
Low resonant frequency

Basic parameters:

Resonant frequency (fs)	760 Hz	Nominal impedance (Zn)	4 Ω
Effective diaphragm diameter	21mm	DC resistance (Re)	3.0 Ω
Ferrofluid ? Y/N	Yes	Max power handling	60 W
Recommended crossover	2.6kHz/12dB	Faceplate diameter	92mm
Sensitivity (2.83V/1m)	90dB	Cutout hole diameter	64mm

Here's the full datasheet:

Inexpensive replacement for old Scanspeak D2008

Firstly, thank you for the excellent service!

I wanted to replace a pair of old 92mm faceplate Scan-speak D2008/8203 tweeters I've been using with KEF B100B bass driver for many years. The replacement D2008/8511(now discontinued) would 'drop in', although isn't a perfect replacement efficiency or sound wise (the 8203 was heavily doped). The wonderful Hiquphon OW1/92 would be first choice but sadly out of my price range!

The SB21RDC-C000-4 required a little modification to the cabinet, simply to accommodate the connectors, and has four screw holes rather than three - but fits flush with the baffle.

I've had to re-work the crossover somewhat (this is a 4ohm tweeter), but the results are very promising using a third-order high-pass with an l-pad (1.5/2.7 ohm based on the 3 ohm DCR). Currently using a 5.6 and 16 microfarad capacitors and a 0.125mH inductor, which seems to blend rather well. I'm sure I'll tinker more, but there's really nothing to dislike as it is.

Thankyou for your review Peter!
Will & Caroline

SB Acoustics SB21RDC-C000-4 Tweeter

Key Features:

Basic parameters:

Here's the full datasheet:

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SB Acoustics SB21RDC-C000-4 Tweeter

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Here's the full datasheet:

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