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Multi-Way Conventional loudspeakers with crossovers

Bass driver SPH 255 monacor lacks bass
Bass driver SPH 255 monacor lacks bass
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Old 3rd December 2018, 01:13 PM   #1
fjadouce100 is offline fjadouce100  Mauritius
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Default Bass driver SPH 255 monacor lacks bass

Hi to all, since some time now I have built a 3 way 60L enclosure with bass driver monacor SPH-255 , mid driver Monacor MS130 and an unbranded tweeter probably an Audax , but despite several tweaks effected, damping material and port length adjusted, I am still not satisfied with the bass despite the woofer specs seem ok.
I shall be posting all possible info soon.
ALDO
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Old 3rd December 2018, 01:16 PM   #2
fjadouce100 is offline fjadouce100  Mauritius
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More information can be obtained from the attachments:-
Attached Images
File Type: jpg Crossover project SPH255 001.jpg (49.8 KB, 356 views)
File Type: jpg LIMP Impedance SPH255 in 60 L enclosure.jpg (72.8 KB, 351 views)
Attached Files
File Type: pdf SPH 255 TS Parameters.pdf (8.2 KB, 23 views)
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Old 3rd December 2018, 01:18 PM   #3
fjadouce100 is offline fjadouce100  Mauritius
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Some more info here
Attached Images
File Type: jpg Bassbox Impedance SPH255 in 60 L enclosure.jpg (41.3 KB, 342 views)
File Type: jpg Bassbox Simulated amplitude response.jpg (40.3 KB, 344 views)
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Old 3rd December 2018, 01:23 PM   #4
Zvu is offline Zvu  Serbia
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Probably too little baffle step correction.

Measure frequency response - gated with gate at least 3.5-4ms and we'll see.
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Old 3rd December 2018, 01:40 PM   #5
fjadouce100 is offline fjadouce100  Mauritius
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Tks for reply. Although I have experience in using various enclosure software, I have never measured any frequency response. Have read a lot of course on the subject but I do not own a calibrated microphone. In the meantime, until I solve this issue, what can be done?
Can I have a bit more information about the process "gated with gate" ?
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Old 3rd December 2018, 02:18 PM   #6
Mosquito is offline Mosquito  Argentina
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Lacking measurement gear, if where me, will redo the sims, targeting a gently decrease of the FR towards the highs, until say, 10khz. Then Let it climb again. You Will end with a moderate "loudness" response. Play with the port lenght (shortening) it, until bass suits Your taste.
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Old 3rd December 2018, 02:58 PM   #7
fjadouce100 is offline fjadouce100  Mauritius
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What about the crossover? Is it coherent with the drivers used? The frequency cut-off curves are at approx 700 HZ 6db and 6000Hz 12db for the tweeter?
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Old 3rd December 2018, 03:11 PM   #8
fjadouce100 is offline fjadouce100  Mauritius
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Default Bass driver SPH 255 monacor lacks bass

I had done this homework over weeks and weeks of intense listening and have been reducing progressively the mid which has as SPL 94db, as compared to the SPH255 with SPL 91db, while the tweeter I presume shoud be around 9- to 92 db, and I have tried to reduce its level also, but the whole thing would lack musicality.
Here is a photo of the enclosure. H 100 cm xW30 cm x D35cm.
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File Type: jpg Photo of enclosure.jpg (285.5 KB, 322 views)

Last edited by fjadouce100; 3rd December 2018 at 03:13 PM.
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Old 3rd December 2018, 04:09 PM   #9
DougL is offline DougL  United States
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A couple of comments:
1. Try putting your speakers flush against a wall as a test. If they sound better, your crossover needs "baffle step" correction to sit further out in the room.

2. I would re-do your front baffle. The closer you can get the tweeter and midrange together, the better. Ideally, the center to center distance should be 1/4 wavelength or less at the crossover frequency. In the real world, that's not usually possible, but closer is always better.

HTH

Doug
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Old 3rd December 2018, 04:11 PM   #10
Lojzek is offline Lojzek  Croatia
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Default Study how to design a crossover using a simulation

Google this:

Dave Dal Farra Simple Loudspeaker Design ver2
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