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Low THD Tang Band RBM drivers?
Low THD Tang Band RBM drivers?
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Old 4th February 2018, 10:32 PM   #1
Nanoloop is offline Nanoloop  Hong Kong
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Default Low THD Tang Band RBM drivers?

Hi,

Has anyone measured Tang Band's claims that their patented RBM woofer designs produce less distortion?

Click the image to open in full size.

Parts Express are selling the W5 2053 at a discount... and Win ISD says it will work in a tiny 3 or 4 litre box ... can fill in the bottom octave on a low SPL 2.1 system?

From Parts Express:

Tang Band W5-2053 5" RBM Flat Panel Subwoofer 4 Ohm
Tang Band designed their revolutionary RBM (Real Balanced Mode) flat subwoofers for ultra-linear operation, while remaining as thin as possible. The secret to their low distortion performance is in the patented symmetrical suspension system.

While most subwoofers rely upon a spider/surround combination to keep the cone travel linear, Tang Band has developed a new injection molding process that incorporates front and rear cones, as well as dual opposed surrounds.

Similar to an isobaric subwoofer alignment, the two cones work together to modulate a single column of air, reducing non-linear harmonic distortion. The added mass of the rear cone/surround assembly also reduces free air resonance.

Tang Band's W5-2053 5" RBM mini subwoofer features extensive venting on the rear cone, voice coil former, and back plate to keep the large, overhung, neodymium-powered voice coil cool. A bumped back plate allows for momentary moments of over-excursion without damage. Additionally, it offers low distortion frequency response that reaches down to 35 Hz.
Product Specifications
Nominal Diameter5"
Power Handling (RMS)40 Watts
Power Handling (max)80 Watts
Impedance4 ohms
Frequency Response35 to 800 Hz
Sensitivity80 dB 1W/1m
Voice Coil Diameter1.5"
Thiele-Small Parameters
Resonant Frequency (Fs)35 Hz
DC Resistance (Re)3.6 ohms
Voice Coil Inductance (Le)0.19 mH
Mechanical Q (Qms)4.64
Electromagnetic Q (Qes)0.36
Total Q (Qts)0.33
Compliance Equivalent Volume (Vas)0.14 ft.³
BL Product (BL)9.31 Tm
Diaphragm Mass Inc. Airload (Mms)39.92g
Maximum Linear Excursion (Xmax)8 mm
Surface Area of Cone (Sd)75 cm²
Materials of Construction
Cone Material Poly Composite
Surround Material Rubber
Basket / Frame Material Polymer
Magnet Material Ferrite


EDIT the driver finally arrived and here are some pics of the build, which is still a work in progress.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Last edited by Nanoloop; 7th April 2018 at 03:02 AM.
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Old 8th February 2018, 10:42 AM   #2
wolf_teeth is offline wolf_teeth  United States
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They are low HD drivers, and the 8" is an astoundingly clean marvel. Definitely flagship material.
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Old 8th February 2018, 11:15 AM   #3
bentoronto is offline bentoronto  Canada
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Low THD Tang Band RBM drivers?
Nice to see progress.

With all the huffing and puffing from Klippel, hard to see material change* in design from my 1960 Stephens Trusonic driver to mainstream fancy Rice-Kellogg today?

Anybody think rolled rubber and starched cloth (stretching as the spider stretches in and out) make for a linear spring mechanism?

Very good to see fresh thinking about driver design. At last.

B.
*OK, that's a trick question: you can't "see" an inductance ring on the pole piece
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Old 9th February 2018, 01:01 PM   #4
MemX is offline MemX  United Kingdom
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Pardon my stupidity, but is the only difference between this and a 'normal' driver the additional of another cone and spider behind the usual one?


I am struggling slightly to see any additional differences??
https://www.parts-express.com/pedocs...20Assembly.pdf


I haven't had any caffeine today yet, though, so I might not be functioning on all cylinders...
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Old 9th February 2018, 02:32 PM   #5
bentoronto is offline bentoronto  Canada
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Low THD Tang Band RBM drivers?
Quote:
Originally Posted by MemX View Post
Pardon my stupidity, but is the only difference between this and a 'normal' driver the additional of another cone and spider behind the usual one?
Hard to tell what's new. But just anything new is new, although there's not much that's actually novel and not actually on some exceptional driver somewhat else except the suspension.

But then, really not much matters too much except (1) the linearity of the motor and (2) the linearity of the restorative mechanism (assuming it needs a restorative mechanism aside from a proper two-directional and feedback motor).

Since a corrugated spider is the universal restorative mechanism, sure nice to see ANYTHING new along those lines.

For really new stuff, look at the planar forum, not the sub forum.

B.
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Old 9th February 2018, 02:51 PM   #6
bjorno is offline bjorno  Sweden
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Default T/S Tang Band W5-2053= ~Tang Band W5-2089

Hi All,

FYI:

b
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File Type: png RBM-vs-Legacy.PNG (490.4 KB, 428 views)
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Old 11th February 2018, 01:13 PM   #7
MemX is offline MemX  United Kingdom
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Quote:
Originally Posted by bjorno View Post
Hi All,

FYI:

b
Thanks bjorno!


That's interesting.


It looks like they are relying on the surrounds of each of the cones to be the 'restorative mechanism' that brings the (flat) cone back to the centre point, rather than a spider?
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Old 11th February 2018, 01:21 PM   #8
Nanoloop is offline Nanoloop  Hong Kong
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Yes, no spider (!), and a mimic on an isobaric cone arrangement.
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Old 11th February 2018, 02:34 PM   #9
bentoronto is offline bentoronto  Canada
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Low THD Tang Band RBM drivers?
Nothing isobaric except pix. I'd say the similarity is minor.
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Last edited by bentoronto; 11th February 2018 at 02:39 PM.
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Old 11th February 2018, 02:40 PM   #10
scottjoplin is offline scottjoplin  Wales
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