Hi,
You just make all the capacitors a lot smaller, but FWIW no way will
you end up with a c/o suitable for a high quality classic 2-way.
rgds, sreten.
Shown is the transfer functions of a quality two way,
functions are some form of second order electrical but the
c/o 4th order L/R acoustic combined with driver responses :
You just make all the capacitors a lot smaller, but FWIW no way will
you end up with a c/o suitable for a high quality classic 2-way.
rgds, sreten.
Shown is the transfer functions of a quality two way,
functions are some form of second order electrical but the
c/o 4th order L/R acoustic combined with driver responses :
Linkwitz-Riley Electronic Crossover
End of page, download LR calculator.
Caution: IC1b and IC2a form a high pass filter.
Might be to leave them as this.
or transform them into low pass 2nd order
End of page, download LR calculator.
Caution: IC1b and IC2a form a high pass filter.
Might be to leave them as this.
or transform them into low pass 2nd order
Last edited:
Thanks for input, the pasive crossover for tweeter (MB Electronics MCD25 titanium-dome) is crossed over at 2kHz and 2nd order, for active crossover will be the same order & frecuency? the loudspeaker is Hales Two Signature with two Dynaudio 17W75EXT woofers (any recommendation for active filter frecuency & order?) & one MB Electronics MCD25 titanium-dome tweeter are mounted toward the top of the enclosure and configured in a D'Appolito arrangement.
Specifications (Stereophile)
Description: Two-way sealed-box dynamic loudspeaker with two 7" bass-midrange drivers and one 1" titanium-dome tweeter. Crossover frequency: 2kHz. Impedance: 4 ohms nominal, 2.9 ohms minimum. Frequency response: 40–26kHz ±3dB anechoic (in-room –—dB point will be lower). Sensitivity: 87dB (distance and input power not specified, but assumed to be 1W/1m).
Thanks in advance for help
Specifications (Stereophile)
Description: Two-way sealed-box dynamic loudspeaker with two 7" bass-midrange drivers and one 1" titanium-dome tweeter. Crossover frequency: 2kHz. Impedance: 4 ohms nominal, 2.9 ohms minimum. Frequency response: 40–26kHz ±3dB anechoic (in-room –—dB point will be lower). Sensitivity: 87dB (distance and input power not specified, but assumed to be 1W/1m).
Thanks in advance for help
The loudspeakers aren't mine, my friend who owns the Hales have one stereo power amp Thereshold 50W RMS class A & another stereo power amp Accuphase also 50-60W RMS class A as you & I know the Hales needs more power to sound good, my friend don't want other amps in class B, AB or digitals and loves the Hales sound only needs a little more of power in amps and one possibility to show my friend is go active: it's only a test so I don't need an accurate active crossover it's only to see if going active gain enough to power the Hales, if the test give results my friend will take a decision: or change the amplification or to buy a serious active crossover like BSS or similar.
Hi,
Hales Audio System Two Signature loudspeaker | Stereophile.com
FWIW going active with a 2 way will barely change maximum
levels and this will be even less so with a low impedance MTM.
Class A and low impedances do not mix, unless the amplifier
can resort to Class B. If it can't (its single ended) then 50W
into 8 ohms is going to drop to something about 15W here.
The required amplifier power ratio for a c/o point of 2KHz is
an arguable point, but with 50W on the two bass/mids, IMO
15W is more than enough for the treble, and anything more
won't affect how loud it goes, the bass/mid will simply clip.
(If reality here is 50w/8R pure class A on the bass/mid
being only around 15W, 4W for the treble is about right.)
IMO its a bad idea, it won't work, and the c/o will be wrong.
Anyone who knows their class A amplifiers IMO here would
simply state some advanced/enhanced form of class A is
required that does low impedance loads well, inevitably.
rgds, sreten.
Bi-wiring is possible, so that means bi-amping is also possible,
but the two amplifiers need to have the same gain. Biamping
with class A moreorless will give very near the increase in
volume a fully active arrangement would, if you high pass
the treble amplifier with a small input coupling capacitor.
Hales Audio System Two Signature loudspeaker | Stereophile.com
FWIW going active with a 2 way will barely change maximum
levels and this will be even less so with a low impedance MTM.
Class A and low impedances do not mix, unless the amplifier
can resort to Class B. If it can't (its single ended) then 50W
into 8 ohms is going to drop to something about 15W here.
The required amplifier power ratio for a c/o point of 2KHz is
an arguable point, but with 50W on the two bass/mids, IMO
15W is more than enough for the treble, and anything more
won't affect how loud it goes, the bass/mid will simply clip.
(If reality here is 50w/8R pure class A on the bass/mid
being only around 15W, 4W for the treble is about right.)
IMO its a bad idea, it won't work, and the c/o will be wrong.
Anyone who knows their class A amplifiers IMO here would
simply state some advanced/enhanced form of class A is
required that does low impedance loads well, inevitably.
rgds, sreten.
Bi-wiring is possible, so that means bi-amping is also possible,
but the two amplifiers need to have the same gain. Biamping
with class A moreorless will give very near the increase in
volume a fully active arrangement would, if you high pass
the treble amplifier with a small input coupling capacitor.
Last edited:
Bafle step before the active crossover? this is the correct schematic & values?
An externally hosted image should be here but it was not working when we last tested it.
I put it after crossover.
You can play with C value, depending on baffle width and taste.
Check the class A amps are push pull and not single ended.(Sreten agreed)
I use an active set up using 3 x 25w classA push pull amps (Pass F5).
Though my drivers are not low impedance and have 90db efficiency.
You can play with C value, depending on baffle width and taste.
Check the class A amps are push pull and not single ended.(Sreten agreed)
I use an active set up using 3 x 25w classA push pull amps (Pass F5).
Though my drivers are not low impedance and have 90db efficiency.
Last edited:
Thanks for the input, isn't possible to bi-amping because separate filters have two connections with a jumper for bi-wiring or bi-amping but in these filters I suppose it's soldered inside the filter because when used without jumpers I connected one or the other binding post and always sounds the tweeter & woofers.
There are a difference of 3 dBs between Hales & your system, can be enough 25W for Hales, what is the nominal impedance of your loudspeakers?
My three drivers are 8 ohms.
Anyway, when i want to play loud, i use a 100w class AB fo the woofer
(until 300hz).
Finally I am with Sreten.
You will not get really more dynamics going active (or biamping)
because a 2000hz c/o point will not allow to share equally power between the two ways.
A c/o at 250/300hz would do it better. Like between a woofer and mid/high. Which is not your case.
Anyway, when i want to play loud, i use a 100w class AB fo the woofer
(until 300hz).
Finally I am with Sreten.
You will not get really more dynamics going active (or biamping)
because a 2000hz c/o point will not allow to share equally power between the two ways.
A c/o at 250/300hz would do it better. Like between a woofer and mid/high. Which is not your case.
Last edited:
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.