i have an old DIY speaker circa 1985. The 8" woofer,6" midrange and 1.5" tweeter are all Indian philips made. mid range and woofer have paper pulp cone.After about 15 years of silence(as the earlier amp went bust) i had acquired an DIY amp. Now after low volume running for about 70 hours the speakers have been jolted out of their reverie and singing at good volume.
the problem is that the midrange particularly human voices sound thin and donot have the natural timbre and fullness in all cases from falsetto/female voices to male baritone. I am using transcend PMP having five band equaliser,LG 3in 1 cd player(no equaliser) and my new Pavilion HP G6 laptop windows media player( 10 band graphic equaliser). Despite trying all permutations the human voices range is within narrow envelope although the voices are clear and also slightly project a little forward and a little above the speakers. Other sounds in the midrange appeared to be OK.
1. I tried to reduce the treble in the amp but the sound became flat and when i increase it the voices have added sibilance in many songs even within the narrow sound envelope.
2. The midrange is enclosed in separate enclosure and originally it was without any padding. As an experiment i added some normal cotton and some harshness in the voices disappeared but still no body in the voices.
3. one of the mid range has a small 1cm dia hole due to insects. But i donot think that is going to affect as i donot hear any audible distortion at listening volumes. One option is to replace the cone/coil of the speaker. In that case should it be of paper cone type or the modern polypropelene etc cone speaker? or should i replace the both the midrange ? If so with which type i.e paper cone or otherwise? and brand which is not too expensive?
the crossover appears to be OK as bass and treble are pretty good for about 30 year old speaker. I also donot want to tamper with electronics including amp but the solution sought is by modification to mid range driver to get the full bodies voices in the entire range
The impedance is 8 ohms. The mid range is rated at Pm 12 w. If it is peak i think it does not truly reflect the speaker capacity as it is pretty loud. although model number is indicated below it would not serve any purpose as it would not be manufactured now. 257 37812 21P 620.
I would perhaps require a better mid range. Any suggestion?
The pictures are attached. I hope they upload
the problem is that the midrange particularly human voices sound thin and donot have the natural timbre and fullness in all cases from falsetto/female voices to male baritone. I am using transcend PMP having five band equaliser,LG 3in 1 cd player(no equaliser) and my new Pavilion HP G6 laptop windows media player( 10 band graphic equaliser). Despite trying all permutations the human voices range is within narrow envelope although the voices are clear and also slightly project a little forward and a little above the speakers. Other sounds in the midrange appeared to be OK.
1. I tried to reduce the treble in the amp but the sound became flat and when i increase it the voices have added sibilance in many songs even within the narrow sound envelope.
2. The midrange is enclosed in separate enclosure and originally it was without any padding. As an experiment i added some normal cotton and some harshness in the voices disappeared but still no body in the voices.
3. one of the mid range has a small 1cm dia hole due to insects. But i donot think that is going to affect as i donot hear any audible distortion at listening volumes. One option is to replace the cone/coil of the speaker. In that case should it be of paper cone type or the modern polypropelene etc cone speaker? or should i replace the both the midrange ? If so with which type i.e paper cone or otherwise? and brand which is not too expensive?
the crossover appears to be OK as bass and treble are pretty good for about 30 year old speaker. I also donot want to tamper with electronics including amp but the solution sought is by modification to mid range driver to get the full bodies voices in the entire range
The impedance is 8 ohms. The mid range is rated at Pm 12 w. If it is peak i think it does not truly reflect the speaker capacity as it is pretty loud. although model number is indicated below it would not serve any purpose as it would not be manufactured now. 257 37812 21P 620.
I would perhaps require a better mid range. Any suggestion?
The pictures are attached. I hope they upload
hyeah: as i had given some other repair work on DIY amp also. Replacing volume pot,balance and a small capacitor in amp besides cone replacement cost 450/ including door service. I am showing the repaired speaker below and it has some logo imprinted on the cone on the left hand side.
