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Old 9th November 2011, 07:11 PM   #1
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Default Audiomaster crossover help please

Hi,
Earlier in the year I bought a set of Audiomaster MLS 2's (I think).
They really were in poor shape. Both tweeter coils were fried (AudaxHD100 D25), which I managed to replace & one of the Dalesford 8" drivers had also been wrecked, so I replaced both with 8" peerless drivers, but first compared the good Dalesford against a Peerless for a couple of days & they sounded close enough to my ears.
I have also recapped them.
The problem is they sound really bright.
The only way I can get them to sound good is when I put them through my media center with about -10db treble which is far from ideal as I want to run them on a different system with no tone controls.
Below is a link to a picture of the front & the back of the crossover:
Audiomaster MLS 2 Crossovers pictures by Impman71 - Photobucket
Any advice gratefully received
Cheers,
Colin
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Old 9th November 2011, 07:27 PM   #2
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You can test an L-pad (constant or variable) on the tweeter. If the problem is the woofer or mid band this doesn't work.
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Old 9th November 2011, 07:37 PM   #3
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I think the problem is more in the upper midrange on the woofer.
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Old 9th November 2011, 08:10 PM   #4
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Look up impedance correction zobel network for crossovers, putting one on the woofer may help your problem as it will help the roll-off to be more consistent.
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Old 9th November 2011, 09:19 PM   #5
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Thanks richie00boy, I found a calculator here:
Crossover Design Chart and Inductance vs. Frequency Calculator(Low-pass)
I have contacted the seller of the peerless woofers to see if he knows the le value.
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Old 9th November 2011, 10:37 PM   #6
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which model Peerless?

link to tweeter specs:
http://spicaspeakers.com/drivers/audax-hd100d25.pdf
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Last edited by PeteMcK; 9th November 2011 at 10:48 PM.
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Old 10th November 2011, 08:06 AM   #7
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Thanks for the link.
I think I may have discovered the problem but not sure how to fix it.
The Audax tweeter has a sensitivity of 89db whereas the woofer is 92db.
I know it's not "best practice" but can I put an L pad on the woofer?
The Peerless are SKO204 8". I can't find a spec sheet online so am waiting for Ebay seller to get back to me.
Thanks,
Colin
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Old 10th November 2011, 08:48 PM   #8
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re:'can I put an L pad on the woofer?' - no, & that wouldn't solve the problem you describe, quite the opposite.
re:'The Peerless are SKO204' - ahh, these are Peerless India drivers:
Peerless Specs

What are the values of the xover components, & do you have a schematic?
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 10th November 2011, 10:40 PM   #9
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Thanks for the link & advice. I don't have a schematic & there is no info on the web. The caps are 4.7, 8, 10 & 50uf. I think the inductors are hand wound - no markings.
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Old 10th November 2011, 10:42 PM   #10
DrDyna is offline DrDyna  United States
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If it's too bright, I'd probably adjust the value of the resistor in the high pass, or use an L-pad on the tweeter.
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