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Multi-Way Conventional loudspeakers with crossovers

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Old 23rd August 2008, 12:07 PM   #1
Stee is offline Stee  Italy
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Default Consensus Project

My new project is based on the principle of double bass
small signal
great resonance

I took a loudspeaker and refinement with 10 litres of equal volume
in configuration isobarica become 5
put on a volume of 40 litres with reflex tube
means having a volume 10 times greater than necessary

http://www.audiokit.it/ITAENG/Altopa...T25TG30-04.pdf
http://www.audiokit.it/ITAENG/Altopa...13WH-00-08.pdf
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Old 24th August 2008, 11:40 AM   #2
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that sims very badly in Winisd, what freq do you intend to tune the box?
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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 24th August 2008, 07:56 PM   #3
Stee is offline Stee  Italy
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Default around 40 Hz reflex

with only tweeter filter
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Old 24th August 2008, 10:47 PM   #4
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using 40L, there will be a huge peak at 40Hz, the best you can hope for is a -6dB alignment using 7.5L.
I'd forget about isobaric, and use these drivers with a good woofer, they aren't that good for LF
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Old 24th August 2008, 10:56 PM   #5
Andy G is offline Andy G  Australia
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there is also no way the XT will sound any good with the simple series x-o you show in the first post.
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Old 24th August 2008, 11:54 PM   #6
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Looking around the web, the only projects I could find using a pair of P13WHs were Lynn's Ariel & ME2: http://www.audiocraftworks.gr/gr/pag...riel/ariel.htm

The P13s are very good drivers, just not good at bass...
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Old 25th August 2008, 07:04 AM   #7
Andy G is offline Andy G  Australia
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I agree with Pete. The P13WH is a VERY good mid driver, but it looses all that mid niceness if you ask it to do too much bass.

Far better to use it in a 3-way design where it will just do mid duties.

The XT tweeter is also a VERY nice tweeter, but you have to stay away from its res freq or put a whooping LCR circuit on it. The proposed series x-o does neither.
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Old 25th August 2008, 02:28 PM   #8
Stee is offline Stee  Italy
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Default yes are not good for bass

also this idea about double bass effect is rubbish
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Old 25th August 2008, 02:39 PM   #9
lineup is offline lineup  Sweden
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Default Re: yes are not good for bass

Quote:
Originally posted by PeteMcK
[B]
The P13s are very good drivers, just not good at bass... /B]
Quote:
Originally posted by Andy Graddon
I agree with Pete. The P13WH is a VERY good mid driver, but it looses all that mid niceness if you ask it to do too much bass.
Quote:
Originally posted by Stee
... this idea about double bass effect is rubbish

I have to agree, if we mean to get lower NORMAL bass.
One 5 inch ( 130 mm ) will never make more than small monitor bass sound.
VIFA small woofers, mid woofers, are good in quality
and especially very good in Performance/Price comparison.

Double, TWO 130 mm woofers will not change towards the lower bass.
It can however reduce the midrange distortion.
As each woofer makes 50% of the sound only.
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