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Multi-Way Conventional loudspeakers with crossovers

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Old 2nd March 2019, 08:42 PM   #1
jkthn is offline jkthn
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Hi!

I am building a 2way front bookshelf speakers.I have done a crossover by my self,and is confused why it is sounding a little bit of(is playing in a box). My combination is!

dayton 6" rs150p4 woofer
seas h1396 tweeter
19mm mdf board,and silent coat 5mm inside(maybe toolite damping) And 20cm(8"x2" vent ) and a 0,38ft3 box exclusive woofer and vent. In music it is good,in a movie it can be sounding very odd in speech, not always, maybe it is litte off a input difference too.
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Old 3rd March 2019, 01:36 AM   #2
cspieker is offline cspieker  United States
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Double check that the drivers are all wired with the right polarity. If you don't discover anything wrong there, get a umik and REW and see how she measures.
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Old 3rd March 2019, 02:08 AM   #3
LineSource is offline LineSource  United States
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It looks like your crossover frequency is 4kHz, which is high for a 6" midrange driver. The RS150P-4 datasheet shows beaming begins around 2.2kHz, and cone breakup around 5kHz.

A 2kHz crossover frequency would produce better polar response, and less midrange cone break-up distortion. You will probably be satisfied with an LR2 cricuit on the midrange, but a BW3 circuit would further attenuate the 5kHz RS150P-4 cone breakup.
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Old 3rd March 2019, 02:13 AM   #4
jplesset is offline jplesset  United States
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Your existing crossover is 2nd order. 2nd order crossovers need to run the tweeter reversed from the woofer. Swap the wiring on the tweeter, and listen...
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Old 3rd March 2019, 02:42 AM   #5
DickHertz is offline DickHertz  United States
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Depends on the filter. Butterworth filters do need to be connected with reverse polarity. Linkwitz/Reilly should be connected with the same polarity.
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Old 3rd March 2019, 02:57 AM   #6
bwaslo is offline bwaslo  United States
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Does your data include differing distance (depth) from the listener? The starting point in space for energy from each is seldom the same, which shows as different relative delay in their signals. With a 4kHz crossover, only 1.7inches worth of delay difference would be a phase shift at crossover of 180degrees, putting a big null there.

That's one reason why it's a good idea to measure the drivers in their baffle and determine their relative delay. Dayton's drivers are mostly provided with data referred to the "baffle mounting plane", but SEAS probably aren't.
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Old 3rd March 2019, 03:01 AM   #7
bwaslo is offline bwaslo  United States
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BTW, you can attach an Xsim .dxo file directly to your post for others to work with.
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Old 3rd March 2019, 08:58 AM   #8
jkthn is offline jkthn
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Quote:
Originally Posted by bwaslo View Post
Does your data include differing distance (depth) from the listener? The starting point in space for energy from each is seldom the same, which shows as different relative delay in their signals. With a 4kHz crossover, only 1.7inches worth of delay difference would be a phase shift at crossover of 180degrees, putting a big null there.

That's one reason why it's a good idea to measure the drivers in their baffle and determine their relative delay. Dayton's drivers are mostly provided with data referred to the "baffle mounting plane", but SEAS probably aren't.
I have measured here,in the rew program.
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Old 3rd March 2019, 12:18 PM   #9
Lojzek is offline Lojzek  Croatia
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Would you specify measurement conditions? If we assume everything with this measurement was done properly, then there is very much room to improve on the crossover. Try to repeat the measurement far field selecting a larger time window (let's see into the 70 Hz region) and separate measurements of each driver attached to its filter.
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Old 3rd March 2019, 12:30 PM   #10
jkthn is offline jkthn
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The microphone is 3,3foot from the speaker,i have measured with the speaker in normal position 1ft from the wall,

Sorry for the bad writing,from sweden ha ha ha..
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