Crossover for 2.5-way speakers...

pixaren · 8th December 2003, 08:50 PM

I wnat to make a crossover for my 2.5-wayspeakers that i should build.

The problem is that i'm not really sure if my schematic i made is corect!

http://w1.454.telia.com/~u45410036/Delningsfilter.jpg
(PICTURE OF MY CROSSOVER)

Tweeter: 6 Ohm
Bas 1: 8 Ohm
Bas 2: 8 Ohm

I want to cut the freq. as follow:

Bas 1: 0-800Hz
Bas 2: 0-2500Hz
Tweeter: 2500-and up

'The xo-filter i made is a 2nd Linkwitz-riley

/pixaren

delwon · 8th December 2003, 09:46 PM

Pixaren,
Your schematic looks to be something that will work. I've built two pair of 2.5 ways and I did my xover a bit differently. Based on your numbers, I'm guessing that your two bass units are 6.5" drivers. I don't know what drivers you're using, but when I built my 2.5 way using two Audax 6.5" units, I ended up with a 1.2mH coil in front of woofer 1 and a 3mH coil between woofer 1 and woofer 2. In other words, the two woofers were wired in parallel with the 3mH coil between the main woofer and the .5 woofer. It works well for me.
Based on your chosen cross point for the main woofer, you'd use something smaller than a 1.2mH coil.

sreten · 8th December 2003, 09:52 PM

It doesn't look right to me, you have 4 ohms in series with everything.

You cannot model the drivers as simple resistances.

You should use a 1st order filter on the '0.5' driver for baffle step compensation.

/sreten.

pixaren · 9th December 2003, 05:39 AM

I will use two Peerless 850490 and a tweeter (Vifa D27TG-45-06)

Please someone, if the above xo-filter is incorrect, will someone be kind to draw me a correct xo for 2½-way system, 2nd Linkwitz-Riley.

Peerless 850490 = 8 Ohm each

Vifa Tweeter = 6 =Ohm

/pixaren

sreten · 10th December 2003, 06:19 PM

I'd quite happily post one if I could but I can't without
a large investment of time, effort and investigation.

Its much more complicated than you seem to think.

If you haven't bought the drivers, build a published design.

Vigier · 10th December 2003, 07:30 PM

Hi sreten,

you can NOT use this schematic if you want a good sound, because of the induction of the HDS205 units (that's the "name" of the 850490 units).

You'll have to correct this with a filter with a R and a C.

I'll calculate it for you, just a few minutes...

Grtz, Joris

sreten · 10th December 2003, 07:43 PM

Hi joris,

you seem to be confused, but if you can help pixaren great !

Vigier · 10th December 2003, 07:53 PM

What do you think of this?

Grzt, Joris

Vigier · 10th December 2003, 07:57 PM

By the way, I already rounded the values of the components to match the E12-series, so these are not the EXACT calculates values, but with the difference in T/S parameters (between datasheet and measurements), it doesn't matter that much.

Grtz, Joris

sreten · 10th December 2003, 09:34 PM

hi Vigier,

looks lot better but the low bass should be rolled off according
to the baffle width by a first order inductor, -3db ~ 400Hz,
not a second-order filter.

The relative sensitivity of the the tweeter and mid bass unit
is not accounted for.

Fix the above and it will work, but there is no account taken of
the frequency and phase response of the drivers, and the
compensations possible via manipulation of the crossover.

sreten.

8th December 2003, 08:50 PM	#1
pixaren diyAudio Member Join Date: Dec 2003 Location: Sweden	Crossover for 2.5-way speakers... I wnat to make a crossover for my 2.5-wayspeakers that i should build. The problem is that i'm not really sure if my schematic i made is corect! http://w1.454.telia.com/~u45410036/Delningsfilter.jpg (PICTURE OF MY CROSSOVER) Tweeter: 6 Ohm Bas 1: 8 Ohm Bas 2: 8 Ohm I want to cut the freq. as follow: Bas 1: 0-800Hz Bas 2: 0-2500Hz Tweeter: 2500-and up 'The xo-filter i made is a 2nd Linkwitz-riley /pixaren

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8th December 2003, 09:46 PM	#2
delwon diyAudio Member Join Date: Jun 2003 Location: Virginia	Pixaren, Your schematic looks to be something that will work. I've built two pair of 2.5 ways and I did my xover a bit differently. Based on your numbers, I'm guessing that your two bass units are 6.5" drivers. I don't know what drivers you're using, but when I built my 2.5 way using two Audax 6.5" units, I ended up with a 1.2mH coil in front of woofer 1 and a 3mH coil between woofer 1 and woofer 2. In other words, the two woofers were wired in parallel with the 3mH coil between the main woofer and the .5 woofer. It works well for me. Based on your chosen cross point for the main woofer, you'd use something smaller than a 1.2mH coil.

8th December 2003, 09:52 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	It doesn't look right to me, you have 4 ohms in series with everything. You cannot model the drivers as simple resistances. You should use a 1st order filter on the '0.5' driver for baffle step compensation. /sreten.

9th December 2003, 05:39 AM	#4
pixaren diyAudio Member Join Date: Dec 2003 Location: Sweden	I will use two Peerless 850490 and a tweeter (Vifa D27TG-45-06) Please someone, if the above xo-filter is incorrect, will someone be kind to draw me a correct xo for 2½-way system, 2nd Linkwitz-Riley. Peerless 850490 = 8 Ohm each Vifa Tweeter = 6 =Ohm /pixaren

10th December 2003, 06:19 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	I'd quite happily post one if I could but I can't without a large investment of time, effort and investigation. Its much more complicated than you seem to think. If you haven't bought the drivers, build a published design.

10th December 2003, 07:30 PM	#6
Vigier diyAudio Member Join Date: Nov 2002 Location: Netherlands	Hi sreten, you can NOT use this schematic if you want a good sound, because of the induction of the HDS205 units (that's the "name" of the 850490 units). You'll have to correct this with a filter with a R and a C. I'll calculate it for you, just a few minutes... Grtz, Joris

10th December 2003, 07:43 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi joris, you seem to be confused, but if you can help pixaren great !

10th December 2003, 07:57 PM	#9
Vigier diyAudio Member Join Date: Nov 2002 Location: Netherlands	By the way, I already rounded the values of the components to match the E12-series, so these are not the EXACT calculates values, but with the difference in T/S parameters (between datasheet and measurements), it doesn't matter that much. Grtz, Joris

10th December 2003, 09:34 PM	#10
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	hi Vigier, looks lot better but the low bass should be rolled off according to the baffle width by a first order inductor, -3db ~ 400Hz, not a second-order filter. The relative sensitivity of the the tweeter and mid bass unit is not accounted for. Fix the above and it will work, but there is no account taken of the frequency and phase response of the drivers, and the compensations possible via manipulation of the crossover. sreten.

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