This 6.5” premium woofer provides both value and performance. A custom fabricated woven carbon fiber cone allows for a rigid piston and fast transient response. A stylish yet sturdy round cast aluminum basket provides easy front mounting in an enclosure. The carefully designed aluminum phase plug eliminates the need for the additional mass of a dust cap and reduces lateral wave energy interference which causes unwanted peaks and dips in the frequency response. It is centered within inner and outer inductance modulating elements to reduce inductance.
- Well vented, non-flexible cast aluminum frame
- Rigid, low-mass woven carbon fiber cone with a decorative red thread for enhanced, distinctive appearance.
- Bumped “T-Yoke” for extra mechanical excursion and thermal venting
- 1.5” (38 mm) voice coil, high temperature copper wire on aluminum former
- Aluminum phase plug for reduction of lateral wave energy interference
- Dual inside-outside copper shorting rings for ultra-low distortion
Bold North Audio products are the most accurate, engineered audio transducers available. Each design requires Klippel vibrational test analyses to verify the key parts of optimal audio performance. While we rely heavily on objective science to lead us, we understand that most of all speakers need to tell the musical truth. Our engineers, musicians, and recording studio veterans are the final judges of when a design is worthy of the Bold North Audio brand.
All Bold North Audio products are assembled in Minnesota, with parts sourced from around the world to produce the highest combination of performance, consistency, and customer value.
| Model # | BWF-6503 |
|---|---|
| Speaker Type | Woofer |
| Size, Nominal (inch & mm) | 6" |
| Shape of Speaker | Round |
| Application | High-End Audio and Home Theater, Home Audio, Indoor, Pro Sound |
| RoHS Compliant | Yes |
| Rated Impedance (Ω) | 8 |
| DC Resistance (Re) (Ω) | 6.25 |
| Rated Power IEC268-5 (W) | 75 Watts |
| Program Power (W) | 150 |
| Frequency Range (Hz) | 35 - 9,000 |
| Sensitivity (dB SPL) ¹ | 87 |
| Resonant Frequency (Fs) (Hz) | 43 |
| Nominal Impedance (Z) (Ω) | 8 |
| Voice Coil Inductance (Le) (mH) | 0.15 |
| Mechanical Q Factor (Qms) | 2.69 |
| Electrical Q Factor (Qes) | 0.43 |
| Total Q Factor (Qts) | 0.37 |
| Moving Mass (Mms) (gm) | 17.8 |
| Suspension Compliance (Cms) (mm/N) | 0.78 |
| Mechanical Resistance (Rms) (kg/s) | 1.80 |
| Surface Area of Diaphragm (Sd) (cm²) | 126.7 |
| Compliance Equivalent Volume (Vas) (L) | 17.69 |
| Motor Force Factor (BL) (T•M) | 8.37 |
| Efficiency (η₀) (%) | 0.30 |
| Efficiency Bandwidth Product (EBP) (Fs/Qes) | 100 |
| Basket Type | Cast aluminum |
| Terminal Size (mm) | 6.4 x 0.8 / 4.7 x 0.5 |
| Voice Coil Diameter (mm) | 38 |
| Voice Coil Wire Material | Copper |
| Voice Coil Former Material | Aluminum |
| Magnet Material | Ferrite |
| Magnet Weight (gm) | 794 |
| Cone Body Material | Carbon fiber |
| Cone Surround Material | Rubber |
| Spider Material | Cotton |
| Dust Cap Material | Aluminum |
| Displacement Limit Due to Force Factor Variation (mm) | 5.30 |
| Displacement Limit Due to Compliance Variation (mm) | 5.63 |
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.
