If i remember correctly the studio series have a unique (and gigantic) waveguide.Wow--that's a really low crossover point for that tweeter. They may be trading off woofer distortion for tweeter distortion.
If i remember correctly the studio series have a unique (and gigantic) waveguide.Wow--that's a really low crossover point for that tweeter. They may be trading off woofer distortion for tweeter distortion.
Yes.. If it's the 5 series you are referring to..If i remember correctly the studio series have a unique (and gigantic) waveguide.
Wow--that's a really low crossover point for that tweeter. They may be trading off woofer distortion for tweeter distortion.
Yes, that compression tweeter is nothing like any dome I've heard...Keep in mind that the Studio 590 uses a compression tweeter in a very large horn. It's nothing like the Stage series tweeter.
Sorry--I read right through the "590" part and thought you were talking about the 190. I doubt that the 590 woofers have the same issue to start with. The 180 woofer distortion profile is pretty unusual.Wow--that's a really low crossover point for that tweeter. They may be trading off woofer distortion for tweeter distortion.
In the same way that my vet can "fix" my dog or how Robocop OCP doctors can 'fix' Alex Murphy.
I think for me, this is a no brain buy at usd$200... that's not even a question.. as furniture around the house you couldnt even buy the MDF for $200, heck you couldnt even buy the cones...
Average prices are around CAN/SG/AUS $1,500!
With DSP you could smooth out all that 'war zone'?
I actually really really like the JBL "house" sound from the budget Studio/Stage series but admittely they can run ragged at the top and bottom but at this price, what did you expect.
At the price they are though....I think we are lucky they measure as good as they do.Maybe cross the woofers lower and put a Tectonic TEBM46C20N-4B in a little box on top? Or if it is not quite sensitive enough, a Faital 3FE25?
Any observations on distortion and sound quality on the A170?JBL A170 crossover photos for comparison:
No filtering on the low frequency driver is pretty bad form.From repair (service) manual of JBL Studio 190
Low-frequency transducer: 2 x 6-1/2" (165mm) PolyPlas™ cones, shielded (16PR90BX-HW01-E) DC resistance:9.0 ohms ±10%• Mid-frequency transducer: 4" (101mm) PolyPlas cone, shielded (10PR75AX-HW01-E) DC resistance:4.6 ohms ±10%• High-frequency transducer: 1" (25mm) CMMD®Lite dome, shielded (36DT25BX-DT01-E) DC resistance:3.6 ohms ±10%• Crossover network:013-7600-05823-E
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Possible to find similar schematics for JBL Stage A180/A190?
From repair (service) manual of JBL Studio 190
Low-frequency transducer: 2 x 6-1/2" (165mm) PolyPlas™ cones, shielded (16PR90BX-HW01-E) DC resistance:9.0 ohms ±10%• Mid-frequency transducer: 4" (101mm) PolyPlas cone, shielded (10PR75AX-HW01-E) DC resistance:4.6 ohms ±10%• High-frequency transducer: 1" (25mm) CMMD®Lite dome, shielded (36DT25BX-DT01-E) DC resistance:3.6 ohms ±10%• Crossover network:013-7600-05823-E
View attachment 212735
Possible to find similar schematics for JBL Sta
It has a big-hog 3.6 mH coil on the woofs. That would be huge if the woofers are each 8 Ohms, because they're running in parallel.No filtering on the low frequency driver is pretty bad form.
That is on just one of the woofers, the bottom one, which compensates for the baffle step. The other one is directly connected and this is why you have all those anomalies in FR in the so called “war zone.”It has a big-hog 3.6 mH coil on the woofs. That would be huge if the woofers are each 8 Ohms, because they're running in parallel.
You will be surprised how bad dispersion will be when you have two drivers at two wavelength apart at the crossover point.I worked up a revised crossover for the 180 last night and cobbled the board together today. I jettisoned the 2.5 architecture, which requires a lot more components that JBL could have afforded to provide in this economy-level speaker. A properly done 2.5 would have a small advantage in vertical dispersion linearity, since interference between the two drivers would be reduced due to the lower crossover point of the bottom woofer. But I don't see any other advantage, and the circuit they used produced a huge THD-inducing peak in the bottom woofer. By running both woofers up to the 2 kHz crossover point, it's possible to trap out any woofer peaks with a single lrc network. I'll probably diddle with this after I listen carefully, but the brightness is gone and so is the distortion. What used to be around 3% THD@90 dB a little above 1 kHz is now .3%. Here's the mod, followed by the stock. The tweeter was disconnected when I measured the stock because I was trying to find the source of the distortion (which was the woofer).
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