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Multi-Way Conventional loudspeakers with crossovers

War of the 10" monster midbasses
War of the 10" monster midbasses
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Old 12th April 2019, 07:23 PM   #61
5th element is offline 5th element  United Kingdom
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Nothing wrong with a 10-12" doing 150-1100Hz.

In fact mated to a good waveguide 1100Hz is a decent frequency to get a directivity match.
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Old 13th April 2019, 09:33 AM   #62
LewinskiH01 is offline LewinskiH01  Argentina
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Quote:
Originally Posted by 5th element View Post
Nothing wrong with a 10-12" doing 150-1100Hz.

In fact mated to a good waveguide 1100Hz is a decent frequency to get a directivity match.
Interested in better understanding this notion. What kind of waveguide and what would the waveguide do for this? Have an effect on the higher part of the range or the lower end of this range (my understanding is a horn would be needed for this).

Following this approach, I wonder how high an 8" mid woofer could be good at.
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Old 15th April 2019, 08:45 AM   #63
5th element is offline 5th element  United Kingdom
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Quote:
Originally Posted by LewinskiH01 View Post
Interested in better understanding this notion. What kind of waveguide and what would the waveguide do for this? Have an effect on the higher part of the range or the lower end of this range (my understanding is a horn would be needed for this).

Following this approach, I wonder how high an 8" mid woofer could be good at.
There's nothing really much to it, Geddes speakers all follow the same basic principle.

A 6" woofer with a 6" waveguide have pretty much the same directivity profile. That is the woofer starts to beam as the waveguide starts to control the tweeters directivity. These two overlap/match in frequency. The ideal is to pick a woofer that can cross over during this narrowing of directivity and crossover to the tweeter around this point. So for a 6" driver you would want to cross over around 2200-2500Hz.

An 12" would better suit 1100Hz cover as mentioned above, but it'd be done with a 10" too provided the tweeter on waveguide could handle it.

An 8" would do well crossed around 1700Hz.

Most metal cone drivers do not suit this approach because they need lower xovers to mitigate their harmonic distortion peaks. You can get around this by crossing over before the woofer starts to beam but it places additional demand on the tweeter so you need something that can cope.

A driver that bucks this trend is the SB17NAC with it's ribbed metal cone and lack of harmonic distortion peaks.

This is probably getting off topic although I suppose it is relevant to the use of large PA mids and mid bass drivers.
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Old 7th May 2019, 02:13 AM   #64
ElecXover is offline ElecXover
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The famous JBL engineer Drew Daniels offered up an all-out system design with the JBL high eff midrange 2123H at its core:


Untitled

This is well worth reading! Note his comments about using a cylinder enclosure 1 foot deep and filled with fiberglass (and ONLY fiberglass!!!) as being crucial to extracting the best from the 2123H or the subsequent, still higher quality JBL 2012H.

Fwiw.

I cannot attest to this personally, but I plan to try a short transmission loading with a ready-made 4 foot folded t-line by Obcon Single 10" Labyrinth from eBay. I'll be using the 18SOUND 10NDA520 with some UltraTouch recycled cotton insulation.

Alex
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Old 16th May 2019, 01:19 AM   #65
InOtIn is offline InOtIn
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Oscar, just curios why you rejected the Faital drivers? I’ve got the 12HP1030 and think they are pretty good....
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Old 16th May 2019, 01:42 AM   #66
OscarS is offline OscarS  United States
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Oscar, just curios why you rejected the Faital drivers? Ive got the 12HP1030 and think they are pretty good....
I agree they are pretty good. The 10FH530 had the least variance in it's frequency response compared to the rest! I just like the other ones better from a harmonic distortion standpoint.
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Old 16th May 2019, 04:41 AM   #67
grec13 is offline grec13  United States
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Quote:
Originally Posted by 5th element View Post
Nothing wrong with a 10-12" doing 150-1100Hz.

In fact mated to a good waveguide 1100Hz is a decent frequency to get a directivity match.
Thank you 5th elemen.
I got two RCF 10L-750YK and they are excellent in the range 175-1100hz.
Very open and clear sound.
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Old 16th May 2019, 02:22 PM   #68
Mleod is offline Mleod  Italy
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Greetings to all !!!



@ OscarS
I beg your pardon Sir, the Beyma 10mc700ND tests will follow or there are new programs in this regard.
Thank you and greetings.



Mleod
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Old 16th May 2019, 03:13 PM   #69
OscarS is offline OscarS  United States
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Greetings to all !!!



@ OscarS
I beg your pardon Sir, the Beyma 10mc700ND tests will follow or there are new programs in this regard.
Thank you and greetings.



Mleod
yes the Beyma 10MC700ND tests will be done, results probably in mid-late June.
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Old 16th May 2019, 06:33 PM   #70
Mleod is offline Mleod  Italy
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We wait with great interest!
Thanks and sincere greetings.



Mleod
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