This is our DHM108B 10 inch sub-woofer that we designed for use in all of our 10 inch sub-woofer cabinets. It is a reliable performer that has withstood the test of time. We've been selling it since 1996 and see no reason to change anything about it.

It is a 10 inch frame that uses an 18 inch motor assembly.  A special nylon disk had to be created to hold the oversize spider because the 10 inch frame is otherwise too small.

              

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MODEL ST225-8/DHM108B
$90.00 ea.

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SPECIFICATIONS

* Voice coil diameter: 2-1/2"
* Voice coil inductance: 1.23 mH
* Nominal impedance: 8 ohms
* RMS / Peak: 275/400 Watts
* DC resistance: 6.9 ohms
* Frequency response: 35-3,000 Hz
* Magnet weight: 56 oz.
* Fs: 40.8 Hz
* SPL: 90.5dB 1W/1m
* Vas: 1.87 cu. ft. (53 liters)
* SD: 56.30 square inches cone area
* Qms: 7.49
* Qes: .33
* Qts: .618
* Xmax: .39 inches (5.5mm)
* Net weight: 12 lbs.
* Displacement: .065 cubic feet
* Overall Diameter: 10"
* Cutout Diameter: 9"
* Mounting Depth: 4-3/4"
* Magnet Diameter: 6-1/8"
* Magnet Height: 1-1/2"

FEATURES

  • 4-Layer 2.5" Voice Coil
  • Kapton Former
  • EPDM Rubber Surround
  • Composite Pulp Cone
  • Bumped and Vented Pole Piece
  • Flat Oversize Linear Spider
  • Heavy Steel Frame
  • 10 LB Strontium Ferrite Motor Assembly
  • High Efficiency
  • Smooth response even for hi-fi
  • Ideal for small boxes including bandpass
  • High Power handling
  • Heavy Duty
  • High Reliability
  • EXCELLENT TIGHT BASS RESPONSE

 

 Generic enclosure recommendation:
 Sealed - 1.0 / Vented 1.5 cubic feet.

  Optional Enclosure Models for the DHM108B

Dear Enthusiast,

Currently everyone is gaga over power handling... i.e... major brand name drivers now claim to handle 500 /1000 plus watts. Problem is the price they paid for that was efficiency. Most of these are around 85 dB sensitivity. That means they will create an SPL of 85dB with one watt of power. Since you have to double your power every time you want a 3dB increase in SPL, it doesn't take long for these high power drivers to be at their thermal limit. For example there is a 10 inch woofer made by MT? that handles 400 watts RMS and is 84.5 dB efficient. That means at 400 watts the SPL is at around 110 dB. This of course assumes you have the money for a good 400 watt amplifier to run it.

Our DHM108B will hit the same 110 dB with around 100 watts. And at it's thermal limit of 275 watts RMS it is doing 114 dB. (Enclosure type and cabin gain adds considerable SPL to the above figures. A pair of these woofers in our wicked one enclosure won a 1999 Outlaw SPL contest with an SPL of 161.8 dB with around 500 real watts.)

If all this is new to you, I recommend reading part of car audio book "Secrets of Car Audio" - it may save you from making costly and all too common mistakes.

 

- Steve Deckert,
  DECWARE / High Fidelity Engineering Co

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by Steve Deckert