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In Reply to: RE: Decipher This posted by smart845 on November 18, 2014 at 23:38:10
Smart845
It isn't the efficiency that is the issue IMO.
It is the inductors in the crossover
that is the blanket to the sound.
Driver is critical in the design though.
Not all midbass' can be run full range.
They need a smooth roll off.
DanL
Follow Ups:
Your speaker drivers have inductors too - the voice coils moving about a central iron core. You also have inductors in your amplifier - the primary winding of the output transformer or plate choke. Inductors are not the problem. What you hear as greater clarity without a crossover inductor is most likely a rising, non-flat frequency response from your speakers.
I disagree ...
What I hear is the lack of control
of the speaker diaphram with an
inductor or a resistor in the crcuit.
The inductor that is in the amp and
in the driver are vastly different than
the one in a crossover electronically.
That's like comparing apples to dump trucks.
DanL
No doubt series resistance and inductor DCR decreases damping and increases Qts. However sealed boxes are pretty forgiving this way, from my experience. Of course you don't want excessive resistance but 5% of the speaker impedance shouldn't be audible.
I still believe from my experience that what you are hearing and liking is a rising frequency response. Every speaker of medium to narrow baffle has this. This is the same argument full range single driver proponents state but fail to measure the frequency response of their system to see it is far from flat.
The DCR of the inductor coil as a crossover is between the amplifier output and the driver and thus lowers the damping factor (adds resistance to the output impedance).
That, IMO, is a valid concern.
I use midrange speakers that do not play very low and are heavily self damped and I don't think a small amount of DCR in the inductor coil would make much of a difference, but with other drivers this could be a valid concern.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre'
My Audax drivers have a Qts
of .25 (5.25") and .54 (4").
They only go down to 200Hz.
When I dropped the inductor
the details went from good
to just plain amazing.
I used a Goertz 12ga copper
ribbon inductor so no slouch.
My woofer has a plate amp so
no iductor there either.
DanL
Have you measured the FR with and without the coil?
My JBL has a QTS of .35 and I don't hear any difference in the bottom (also limited to 200Hz) when I remove the coil but I do hear the response above the 2500Hz crossover point increase.
That can give a sense of increased detail.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre'
I did need to decrease the tweeter cap
to compensate for the extended range.
From ~4K to ~6KHz to be more precise.
Once I did, the difference was awesome.
Vocals were more clear and distinct.
Guitar and piano had better tone.
Transients and decay were more natural.
I got the idea from listening to some
Reference 3A speakers at a show.
I never thought that I could duplicate it.
I was amazed that I did.
DanL
That's cool.
My conclusion, from what you are reporting, is that the range from 4kHz to 6kHz is better served by the mids than the tweeters.
What tweeter is that? It looks like a Morel MDT33.
I have 3 pairs of those.
It is a little surprising that your mids would be better in that range than the tweeters, but I won't argue with you.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre'
Not Morel even better - Dynaudio D260.
No way would I ever think anything
outperforms the Dynaudios.
My brother preferred Morel
but I loved the Dynaudios.
That was before he found Magnepans.
I heard them first and realized
that this is what he would love.
I even said once he heard them
that he would scrap his speakers.
And that's what he did.
Now he's the moderator
on the Planar Asylum.
DanL
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