I have just built some foamcore Karlsonator speakers (0.53x) using W5-2143 drivers - they exceed expectations - and would like to add a pair of subs to these, using a Karlson design as well. Not in foamcore, of course.
I'm just wondering whether the drivers I have - Dayton RS270P-4A (Reference paper 4ohm units) might work in such an enclosure?
Has anyone any experience with either these drivers or similar in an appropriately sized Karlson enclosure?
The mains get to about 50Hz in room so if I can get the subs down to about 25Hz that would be more than adequate.
Failing that, I have RSS265HO-44 and RSS390HO as single sub alternatives.
Specs:
Nominal Diameter10"
Power Handling (RMS)100 Watts
Power Handling (max)200 Watts
Impedance 4 ohms
Frequency Response 23 to 6,000 Hz
Sensitivity 90.9 dB 2.83V/1m
Voice Coil Diameter 2"
Thiele-Small Parameters
Resonant Frequency (Fs)22.9 Hz
DC Resistance (Re)3.9 ohms
Voice Coil Inductance (Le)0.55 mH
Mechanical Q (Qms)1.35
Electromagnetic Q (Qes)0.34
Total Q (Qts)0.27
Compliance Equivalent Volume (Vas)3.9 ft.³
Mechanical Compliance of Suspension (Cms)0.66 mm/N
BL Product (BL)10.9 Tm
Diaphragm Mass Inc. Airload (Mms)73.2g
Maximum Linear Excursion (Xmax)6 mm
Surface Area of Cone (Sd)346.4 cm²
I'm just wondering whether the drivers I have - Dayton RS270P-4A (Reference paper 4ohm units) might work in such an enclosure?
Has anyone any experience with either these drivers or similar in an appropriately sized Karlson enclosure?
The mains get to about 50Hz in room so if I can get the subs down to about 25Hz that would be more than adequate.
Failing that, I have RSS265HO-44 and RSS390HO as single sub alternatives.
Specs:
Nominal Diameter10"
Power Handling (RMS)100 Watts
Power Handling (max)200 Watts
Impedance 4 ohms
Frequency Response 23 to 6,000 Hz
Sensitivity 90.9 dB 2.83V/1m
Voice Coil Diameter 2"
Thiele-Small Parameters
Resonant Frequency (Fs)22.9 Hz
DC Resistance (Re)3.9 ohms
Voice Coil Inductance (Le)0.55 mH
Mechanical Q (Qms)1.35
Electromagnetic Q (Qes)0.34
Total Q (Qts)0.27
Compliance Equivalent Volume (Vas)3.9 ft.³
Mechanical Compliance of Suspension (Cms)0.66 mm/N
BL Product (BL)10.9 Tm
Diaphragm Mass Inc. Airload (Mms)73.2g
Maximum Linear Excursion (Xmax)6 mm
Surface Area of Cone (Sd)346.4 cm²
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At low frequencies, a Karlson is a series tuned 6th order bandpass enclosure, though the port areas and lengths are not well defined. These enclosures are picky about chamber sizes and tuning frequencies. They must be optimized for the particular woofer you use. You can simulate and optimize a 6th order bandpass enclosure in HornResp. I would use round or square ports instead, which will make it easier to predict the tuning frequencies. A lower cut-off of 25 Hz is possible. It will get big and will not get loud for its size, because the RS270P has a low xmax. If enclosure size is no objection, then go for it.
RSSxxxHO are better suited for subwoofer duty and will have more output, but ports can be difficult to fit, as these woofers like small boxes. Small box + low tuning frequency + large air displacement means huge ports.
RSSxxxHO are better suited for subwoofer duty and will have more output, but ports can be difficult to fit, as these woofers like small boxes. Small box + low tuning frequency + large air displacement means huge ports.
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