Thanks, Cliff. I understand your situation. This is hobby work and, although interesting, is not a priority.
As you suggest, I didn't want you to be wasting your valuable time going down the wrong path.
Change one variable at a time, that's the scientific way! 😎
As you suggest, I didn't want you to be wasting your valuable time going down the wrong path.
Change one variable at a time, that's the scientific way! 😎
Good advice.
My mind conned me into the illusion of sonic perfection with just part for part replacement plus cabinet and other tweaks.
I've learned the hard way that the scientific trial and adjust method is the way, before cutting and soldering. 🙁
While putting together an order I noticed Resistors on offer with variations as little as 0.1 of an ohm between them.
Does getting it right come down to such small differences?
Resistor values? That's fun! Standard Resistor Values >> Resistor Guide
The ceramic wire wound resistors I can buy follow the sequence 1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 4.7, 5.6, 6.8Ω etc. and have a tolerance (manufacturing variation) of + or - 5%.
If we take a 3.3Ω resistor, the +/- 5% represents +/- 0.165Ω
On that evidence, I would say that differences of 0.1Ω are not significant when it comes to 'getting it right' in relation to the simple loudspeaker crossovers that you are renovating.
The ceramic wire wound resistors I can buy follow the sequence 1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 4.7, 5.6, 6.8Ω etc. and have a tolerance (manufacturing variation) of + or - 5%.
If we take a 3.3Ω resistor, the +/- 5% represents +/- 0.165Ω
On that evidence, I would say that differences of 0.1Ω are not significant when it comes to 'getting it right' in relation to the simple loudspeaker crossovers that you are renovating.
The basic limit to human perception is somewhere about 0.2--0.4dB, which is about 5% to 10% in power, 2.5% to 5% in voltage & current, which basically agrees with E12 values being OK (E24 is probably detectably better, but only just)
However with active filters or LC filters the response can be more sensitive to component values than simple resistor circuits - 1% or better is often indicated then. However most crossover LC filters are fairly low-order which helps with component tolerances (and losses too).
However with active filters or LC filters the response can be more sensitive to component values than simple resistor circuits - 1% or better is often indicated then. However most crossover LC filters are fairly low-order which helps with component tolerances (and losses too).
Hi Galu.
Due to illness in the family I've been missing from the forum for some time.
I think where we left off was that the tweaking on some of my crossover rebuilds resulted in overly bright sound in the highs.
The instruction was to add low value resistors into the circuits until the sound toned down to an acceptable level.
In the end I just played the speakers without further modification and found that they seemed to bed in and the harshness subsided.
I recall Danny from GR Research advised that sometimes new electronics need to be run in. I don't know if this is the case but it seems to have happened for me.
Finally, I just wanted to thank you for your input and assistance during my early learning phase.
Have you been involved in any hifi projects of late?
Cheers
Cliff
Thanks for the update, Cliff, I hope things are better now.
The toning down of the treble could be down to component run in, or your ears could simply have adjusted to the new sound balance.
I'm glad to have been of assistance and hope you continue to enjoy your upgraded Mordaunt Shorts.
I'm considering tackling a new project, possibly a valve amp kit from World Designs. index Not that I desperately need another amp, just to distract me from the winter blues!
The toning down of the treble could be down to component run in, or your ears could simply have adjusted to the new sound balance.
I'm glad to have been of assistance and hope you continue to enjoy your upgraded Mordaunt Shorts.
I'm considering tackling a new project, possibly a valve amp kit from World Designs. index Not that I desperately need another amp, just to distract me from the winter blues!