Technical Details


SKF-648 2-Way Acoustic Suspension Front Speakers

  • 8 cm Cone Woofer
  • 2.5 cm Balanced-Dome Tweeter
  • Max. Input Power: 130 W
  • Gloss Finished
  • Magnetically Shielded
SKC-648 2-Way Acoustic Suspension Center Speaker
  • 8 cm Cone Woofer x 2
  • 2.5 cm Balanced-Dome Tweeter
  • Max. Input Power: 130 W
  • Gloss Finished
  • Magnetically Shielded
SKR-648 Full-Range Acoustic Suspension Surround Speakers
  • 8 cm Cone
  • Max. Input Power: 130 W
  • Gloss Finished
  • Magnetically Shielded
Note: All speakers feature an impedance of 6 Ω, colorcoded speaker terminals and cable.

SKW-501E Bass Reflex Powered Subwoofer
  • 20 cm Cone
  • Rated Output Power: 80 W (Minimum Continuous Power, 4 Ω, 100 Hz, 1%, IEC)
  • Down-Firing
  • Gloss Finished
  • Output Level Control

Cabinet Construction Based on Takamine Voicing Acoustic Technology
The project team chose mahogany—a wood that is widely used to construct high-quality guitars—as the base material for this speaker. The mahogany is used as part of a three-layer laminate: two outer mahogany layers with an inner plywood layer. The cabinet was built by closely following methods used in the making of Takamine guitars. Of particular note is the bracing inside the cabinet that contributes to tonality. As Takamine stressed, it is particularly important to use the material’s strength effectively throughout. What followed was a detailed fine-tuning process of the cabinet that continued until all parties were satisfied. To include the baffle with one rounded piece, it was necessary to consider how standing waves and diffraction within the cabinet would affect the speaker’s sound. Then, to support the woofer/tweeter units and the network circuit, the team reinforced the interior with MDF to remove any unnecessary vibrations. To construct a speaker like a guitar, where one flat piece of material is manipulated to achieve its symmetry is an extremely difficult process. Recognizing Takamine’s contribution, the construction process has been named “Takamine Voicing Acoustic Technology.”
New A-OMF Monocoque Diaphragm to Support Woofer Unit
As the latest development in Onkyo Micro Fiber (OMF) for woofer diaphragms, A-OMF Monocoque forms one continuous cover from the center cap over the whole diaphragm’s surface. Like Advanced Onkyo Microfiber (A-OMF), A-OMF Monocoque comprises three layers: an outer polyethylene naphthalate (PEN) layer, an inner aramid layer, and a flexible cotton weave layer between the two. The PEN has a twill (textile weave) that enables the fiber’s weight to be reduced by 30%. By forming one continuous layer over the surface off the diaphragm woofer, A-OMF Monocoque helps prevent breakup (occurring when the cone flexes instead of moves as a perfect piston). Essentially, the fiber is an integral part of the woofer unit, and it serves as a perfect complement to the woofer unit’s piston motion range.
Highly Responsive Ring-Drive Tweeter to Take Frequency Response out to 100 kHz
The D-TK10’s ring-drive tweeter enables an accurate response at high frequencies. The tweeter is designed to take the control of breakup to its limits, and its piston motion enables it to reach the higher end of the frequency range (with no sign of breakup). With the tweeter’s aluminum equalizer, it is possible to get a flat frequency response out to 100 kHz. The whole tweeter unit works to prevent any necessary vibration and to completely remove any noise.
Aero Acoustic Drive to Cut Off High Frequency Interference
Poorly designed bass reflex speakers will be affected by membrane overshoot and poor transient response behavior. With any vented design, the size and placement of the duct is crucial in ensuring that the woofer’s rear-firing and front-firing waves are both in phase. Through its own research of different duct shapes, Onkyo has developed a long, narrow duct—called the Aero Acoustic Drive—that has been proven to be more effective than a circular duct in separating low and high frequency sounds. The bottom duct is separated from the cabinet to further reduce cabinet vibrations. The end result is a more natural, precise sound output.
High Quality Network Circuit with Quality Parts
The D-TK10’s network circuit has a ground potential that is free of any fluctuations, making it possible to generate high-quality audio playback. The circuit also helps to prevent the masking of faint sounds. The parts that make up the D-TK10—including a high-quality, German-made WIMA film capacitor; a leakage-free cable; and gold-plated banana plug-compatible speaker posts—have been included based on the know-how that Onkyo has gained from years of speaker development.

Current Product: SKS-HT648

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