- EXTENDED FREQUENCY RESPONSE
- Hard anodized aluminum cone, aluminum basket
- Designed for hi-fi and outdoor applications
- 61FHM mid-woofer was designed for outdoor applications, yet it will shine in hi-fi home and studio applications as well. Optimized ferrite based magnetic circuit with good air-venting features ensures long lasting performance. Our engineers have chosen hard-anodized cone with rubber surround for this model. Both of these components are produced with UV stabilizers.
- Furthermore, REDCATT state of the art adhesives and dispensing techniques ensures waterproof seals in all weather exposed glue joints. Sealing to the exposure can be guaranteed by EVA gaskets or based upon a request by Form In Place Gaskets. The audio system designers can rest assured we have extensively tested this product with UV exposure,salt exposure and waterproofing.
- The extended mid-frequency response allows the systems to be used with higher resonance frequency HF units. For the best performance in the audio systems, we recommend usage in sealed enclosures. In this model the aluminum cone further improves the mid-frequency response and lowers the harmonic distortion artifacts.
General specs Nominal Diameter: 6.5 in. Rated Impedance: 8 Ohm Power handling AES Power: 60 Watts Program Power: 120 Watts Voice Coil Diameter: 1.5 in. Winding wire: CCAW Former: kapton Winding height: 17.6 mm T/S Parameters Resonant frequency: 37 Hz Re: 5.8 ohm Qes: 0.52 Qms: 11.01 Qts: 0.49 Vas: 28.2 liters Sd: 132.7 cm2 Mms: 16.4 grams Bl: 6.6 Le: 0.4 mH Sensitivity: 87.77 dB Design details Surround Material: Rubber Cone material: Aluminum Spider: Nomex Plate thickness: 5 mm Peak to peak linear cone Displacement 17.4 mm Overall diameter: 181.5 mm Bolt circle diameter: 169.5 mm Baffle cutout dia.: 151 mm Number of mounting holes: 6 Depth (flange to rear): 78.6 mm Net weight: 1.61 kg Ordering codes: 8 ohm version: 61FHMX8-430A Recone kits: Download: Spec download 2D drawing 3D model
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PRODUCT CODE: 61FHMX8-430A
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--- ENCLOSURE RECOMMENDATIONS ---
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ENCLOSURE RECOMMENDATIONS: 61FHMX8-430A
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Driver: 61FHMX8-430A (61FHM) — 6" Mid-Woofer
Key T/S: Fs=37.0Hz, Qts=0.49, Vas=28.2L, Sens=87.77dB
Power: AES 60W / Cont 120W / Peak 240W
Xmax=6.30mm, Sd=132.7cm², Bl=6.6T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Round port (50mm diameter) — adequate for compact enclosures with lower air volume velocity
a) High SPL
Net Volume: 8 liters
Tuning (Fb): 43 Hz
Est. -3dB: 40 Hz
HP Filter: 35 Hz (24dB/oct recommended)
Round Port: 50mm dia × 358mm long
Slot Port: 121mm W × 40mm H × 913mm L
Port Velocity: 11.4 m/s
⚠ Port length exceeds practical limits for this cabinet size.
Consider a passive radiator or aeroport as an alternative to a tuned port.
Notes: Strong mid-bass impact, reduced cone excursion, maximum output
b) Balanced Response
Net Volume: 10 liters
Tuning (Fb): 39 Hz
Est. -3dB: 36 Hz
HP Filter: 29 Hz (24dB/oct recommended)
Round Port: 50mm dia × 389mm long
Slot Port: 121mm W × 40mm H × 991mm L
Port Velocity: 10.4 m/s
⚠ Port length exceeds practical limits for this cabinet size.
Consider a passive radiator or aeroport as an alternative to a tuned port.
Notes: General-purpose PA/subwoofer, even response, good transient behavior
c) Extended Low Frequency
Net Volume: 10 liters
Tuning (Fb): 35 Hz
Est. -3dB: 30 Hz
HP Filter: 23 Hz (24dB/oct recommended)
Round Port: 50mm dia × 437mm long
Slot Port: 121mm W × 40mm H × 1108mm L
Port Velocity: 9.4 m/s
⚠ Port length exceeds practical limits for this cabinet size.
Consider a passive radiator or aeroport as an alternative to a tuned port.
Notes: Deep bass extension, requires proper system protection below tuning
--- Summary ---
The 61FHMX8-430A is a 6-inch mid-woofer driver designed for hi-fi two-way and compact speaker systems, home theater, in-wall and in-ceiling installations, and automotive applications. It operates at 87.8 dB sensitivity (1W/1m). The driver features a compliant suspension design suited to moderate-volume enclosures with extended low-frequency response.
In bass reflex enclosures, the driver performs best in net internal volumes of 8 to 10 liters, tuned between 35 and 43 Hz. This alignment provides a balanced combination of low-frequency extension, cone control around resonance, and efficient port loading. Lower tuning improves deep bass extension but increases excursion below tuning, requiring appropriate high-pass filtering. Higher tuning increases sensitivity and output in the upper bass region while improving mechanical control.
The driver is intended for use with moderate amplification (approx. 60 W AES / 120 W continuous) and DSP control. A high-pass filter in the range of 23–35 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 30–2500 Hz, covering bass through mid frequencies and allowing integration with a tweeter or compression driver in a two-way hi-fi system.
This design is particularly effective in single or multi-driver bass reflex systems used in hi-fi two-way and compact speaker systems, home theater, in-wall and in-ceiling installations, and automotive applications, where extended low-frequency response, wide operating bandwidth, and compact form factor are the primary design priorities.
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