There is a pair of JBL MR 835 PA speakers available locally for a very good price.
I don’t know them or what they sound like but I’m thinking about putting the drivers in tall thin cabs with the 15” woofer on the side and then using real purdy veneer.
And thoughts or warnings?
I don’t know them or what they sound like but I’m thinking about putting the drivers in tall thin cabs with the 15” woofer on the side and then using real purdy veneer.
And thoughts or warnings?
Putting 15" on the side will not bring any advantage in the attempt to shrink the width of the cabinet, because the horn is almost wide as 15" bass driver. On top of that, you must redesign the original crossover.
My advice is to build new enclosure wide enough to accommodate the 15" bass, mount midrange and horn vertically above it, and make the enclosure high and deep enough for the same volume and good eye proportions.
My advice is to build new enclosure wide enough to accommodate the 15" bass, mount midrange and horn vertically above it, and make the enclosure high and deep enough for the same volume and good eye proportions.
Good point about the horn being as wide as the Woof. Ok, so straight up and down to fit the woof.
I was surprised that the 15” “subwoofer” has an fs of only 57hz. First it shouldn’t be called a subwoofer and second I need at least 35hz out of it. Might have to use a MiniDSP to make that happen.
I was surprised that the 15” “subwoofer” has an fs of only 57hz. First it shouldn’t be called a subwoofer and second I need at least 35hz out of it. Might have to use a MiniDSP to make that happen.
FWIW, using the factory specs a 370.2 L/42.5 Hz Fb T/S max flat alignment = 35 Hz F6 or tune it to a rolled off ~35 Hz/-3 dB.
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Well, not a single one 15" driver in a 2-way or 3-way sound reinforcement ("PA") loudspeaker is called a "subwoofer" - the correct term is "midbass" or just "low frequency driver". Of course, there are real 15" subwoofer drivers existing in the PA world, but they are never used in a 2-way or 3-way PA loudspeaker system.
As member GM pointed out, with adequate enclosure volume and tuning frequency, you can enjoy real low bass from this JBL 15" driver without additional subwoofer.
Those are the terms I’d use for sure. That is why I was surprised that JBL used the term Subwoofer.
If I'm not mistaken, the MR series is for the MI market.
They are meant for "Live" sound.
They sound "rough" when playing music, particularly the horn.
They are meant for "Live" sound.
They sound "rough" when playing music, particularly the horn.
What does MI Market mean? I’ve been using older JBL drivers for years in my main system but never found them sounding rough. I wonder if it’s a crossover thing?
MI as in Music Industry.
Meaning for live bands use. Peavey is best known in that market.
To adapt the MR825 for playing CDs or with your pc, you'll likely have to rework the crossover.
Meaning for live bands use. Peavey is best known in that market.
To adapt the MR825 for playing CDs or with your pc, you'll likely have to rework the crossover.
Hmm, with an 850, 2.2 kHz XO points I assumed normally PA whereas MI historically XO the woofer (much) higher to highlight its breakup modes, but if true then the 'quality' of the mid's, HF's responses come into question.
It all depends. Low end 2-way pa speakers generally cross higher up at 3k or even higher.
Cheaper crossover and less chances of blowing the comp driver.
The trade-off is in muffled vocals but higher power handling.
With the MR835, their mid is an 8" crossing from 850 to 2.2kHz.
Perhaps they were trying to isolate the vocals with the 8".
It is fine if you're near the band, say 20-30ft.
At 60ft or more, the vocals lack the throw.
I've used the 2-way MR825 back in the late 90s, I think.
It uses the same woofer and horn/comp drv but without the midrange.
JBL crossover was at 1.5kHz.
The woofer had only a 0.4mH.
I think they were using the natural woofer roll-off.
One thing you should be aware of is though the woofer is 15", it won't go as low as a hifi 15".
Cheaper crossover and less chances of blowing the comp driver.
The trade-off is in muffled vocals but higher power handling.
With the MR835, their mid is an 8" crossing from 850 to 2.2kHz.
Perhaps they were trying to isolate the vocals with the 8".
It is fine if you're near the band, say 20-30ft.
At 60ft or more, the vocals lack the throw.
I've used the 2-way MR825 back in the late 90s, I think.
It uses the same woofer and horn/comp drv but without the midrange.
JBL crossover was at 1.5kHz.
The woofer had only a 0.4mH.
I think they were using the natural woofer roll-off.
One thing you should be aware of is though the woofer is 15", it won't go as low as a hifi 15".