I had a mystery puzzle in my head....see if anyone who can share his experiences.
For the past two month, I decided modified my 10 years old commercial Audax MTM kit. I did the following steps:
1. New order 4 Audax HM170Z from madisound. (The new Audax HM170Z is surprising much heavier and show much more low freq response)
2. Replace old Audax tweeter with scanspeak HDS tweeter.
These actions end up redesign a new crossover. Out of expectation, it take me 2 month job, almost 20 hour per week and still cannot get sound perfect.
(What I mean sound quality, I mean at least surpass Harbeth M30.1 or Gamut m'inent speaker standard. Since I just had both in house for the benchmark comparison).
After so many hour in experiment and tweaking in the crossover, I find the good sound need
(1). Added many damping resistor in the crossover. For example, need series resistor with capacitor.
(2). Slow down the crossover slope when approach crossover point, then place notch after 2~4 octave of crossover point. For example, if crossover set at 2khz, then it would get much refined sound by added notch at ~8khz for woofer and 600hz for tweeter. These notch also need damping resistor.
Point (1) is similar to Lynn Olson result.
The Ariel, Part II
So far, all my crossover component was done by purphase high street eletronic shop (US $0.5 for a 2uF Metallized Polyester capacitor for example)
So if crossover cap need resistor for dampling, does it matter use expensive cap?
I think so called expensive capacitor is just lower down the ESR. But you need damp any way. Why care ESR?
PS:
In such low frequency, I believe the only matter in capacitor from idea is
(a) ESR (b) ESL (c)distortion of capacaitor
I dont beldieve in (b) and (c) since the distortion for a 200Volt passive Polyester capacitor in such low frequency is less even compared to 0.001% OP AMP. Remember the world best speaker driver only achieve 0.1 % distorion at best.
So does it make sense to purphase expensive capacitor? why?
For the past two month, I decided modified my 10 years old commercial Audax MTM kit. I did the following steps:
1. New order 4 Audax HM170Z from madisound. (The new Audax HM170Z is surprising much heavier and show much more low freq response)
2. Replace old Audax tweeter with scanspeak HDS tweeter.
These actions end up redesign a new crossover. Out of expectation, it take me 2 month job, almost 20 hour per week and still cannot get sound perfect.
(What I mean sound quality, I mean at least surpass Harbeth M30.1 or Gamut m'inent speaker standard. Since I just had both in house for the benchmark comparison).
After so many hour in experiment and tweaking in the crossover, I find the good sound need
(1). Added many damping resistor in the crossover. For example, need series resistor with capacitor.
(2). Slow down the crossover slope when approach crossover point, then place notch after 2~4 octave of crossover point. For example, if crossover set at 2khz, then it would get much refined sound by added notch at ~8khz for woofer and 600hz for tweeter. These notch also need damping resistor.
Point (1) is similar to Lynn Olson result.
The Ariel, Part II
So far, all my crossover component was done by purphase high street eletronic shop (US $0.5 for a 2uF Metallized Polyester capacitor for example)
So if crossover cap need resistor for dampling, does it matter use expensive cap?
I think so called expensive capacitor is just lower down the ESR. But you need damp any way. Why care ESR?
PS:
In such low frequency, I believe the only matter in capacitor from idea is
(a) ESR (b) ESL (c)distortion of capacaitor
I dont beldieve in (b) and (c) since the distortion for a 200Volt passive Polyester capacitor in such low frequency is less even compared to 0.001% OP AMP. Remember the world best speaker driver only achieve 0.1 % distorion at best.
So does it make sense to purphase expensive capacitor? why?