|
NAVIGATION
TOP of Page
MAIN Page
HOME Page
BEDROOM BOOK
About the Speaker
Speaker Design
Listening Tests
Specifications
Crossover Network
|
About the Loudspeaker
Speaker with new baffle
|
Speaker with grille
|
The Bedroom Bookshelf Loudspeaker is a compact two way acoustic suspension Bedroom Bookshelf mounted loudspeaker,
built from the remains of the 'Sentinel' speaker and destined for late night listening in the bedroom.
The acoustic performance is quite admirable and the size is ideal for placing on the bed head.
TOP
MAIN
HOME
Designing and Building the Loudspeaker
The Bedroom Bookshelf loudspeaker was created to investigate cone breakup on midrange drivers, and eventually become my
preferred listening source in the bedroom. The speaker is virtually the top end of the old 'Sentinel' speaker
with a different bass driver and a simplified crossover network. The cabinet is thoroughly braced and insulated.
Crossover assembly was on a Jaycar CX-2605 Crossover PCB, using Jaycar off the shelf inductors and polypropylene
capacitors.
After a period with a bare, unfinished cabinet I decided to practice my woodwork skills by replacing the front baffle,
installing grilles and staining the cabinet. The results were worthwhile and produced a neat small loudspeaker with
exemplary performance. They now have both the sound quality and the appearance of a high quality loudspeaker.
The Original Baffle
|
Speaker on Shelf
|
TOP
MAIN
HOME
Listening to the Loudspeaker
Originally the sound came out as rather thin sounding, seemingly lacking midrange. Significant improvement was made
to the speakers by doping the cones - have a look at the sheen on the bass driver cones in the pictures. The speakers
now have a clean musical sound, as I prefer. The bass response seems adequate for such a small speaker, and is quite
effective for late night listening in the bedroom.
TOP
MAIN
HOME
Loudspeaker Specifications
|
Specifications :
|
Two Way Acoustic Suspension Bookshelf
|
Dimensions :
|
155mm(w), 165mm(d), 280mm(h)
|
Enclosure Voume :
|
4.7 litres braced and lined
|
|
Freq. Response :
|
120hz-18khz @ -3dB
|
|
Efficiency :
|
88dB SPL @ 1W @ 1 metre
|
|
Impedence :
|
7.5ohms typical
|
|
Power Handling :
|
20W rms
|
|
Crossover :
|
2,900Hz 2nd Order Linkwitz Network
|
|
Imp. Correction :
|
Woofer and Tweeter Voice Coil Inductance
|
|
Bass Driver :
|
Altronics C0635 100mm Paper Cone Mid/Bass
|
|
Tweeter Driver :
|
Fosters D025N15 25mm Cloth Dome Tweeter
|
TOP
MAIN
HOME
Crossover Network
 Circuit for the Crossover Network
TOP
MAIN
HOME
|
