I am curious how pro systems such as JBL's EON15 (2 way PA/monitor) with a 15" bass driver manage to get down to 42Hz -3dB point with a ported cabinet which couldn't be more than 90 lts internal volume.
Are they trading efficiency for bandwidth? (it would seem this isn't the case) or is there an alignment which will give good extension in a small cabinet (QB3 is the best I know of).
Do the drivers they use for these small 2-way systems have especially low VAS to get them to work in such boxes?
Does anyone know if they use standard alignments at all?
Thanks for any input
Dan
Are they trading efficiency for bandwidth? (it would seem this isn't the case) or is there an alignment which will give good extension in a small cabinet (QB3 is the best I know of).
Do the drivers they use for these small 2-way systems have especially low VAS to get them to work in such boxes?
Does anyone know if they use standard alignments at all?
Thanks for any input
Dan
Simple answer is they don't. The response curves in the brochures are measured at 1W input power. If you ever tried to run full rated power into these cabs at 42 Hz the speakers would self-destruct in a matter of seconds.
Speakers like this are normally used biamped with subs (typically double 18" cones). It is very rare to see the crossover settings for this kind of system set below 100 Hz.
Phil
Speakers like this are normally used biamped with subs (typically double 18" cones). It is very rare to see the crossover settings for this kind of system set below 100 Hz.
Phil
I'm surprised that it is not better than 42Hz-17kHz +/- 3 dB. OTOH, it is rated for 129 dB max SPL which almost 35 dB more than the FR graph. Being able to run these things at painful levels is not atypical. My own studio monitors can deliver 110dB and they are 6.5" drivers. (I used them for sound reinforcement in a parade at near Xmax for 3 hours and they are no worse for wear.)
If you doubt, go listen to a pair and when you ask to them to turn up the input signal, be prepared to turn it down quick.
BTW, this unit is an active speaker. The internal amps are probably well tailored to the drivers. There are no losses due to speaker level cross-overs and no problems related to long runs of speaker cable.
🙂ensen.
If you doubt, go listen to a pair and when you ask to them to turn up the input signal, be prepared to turn it down quick.
BTW, this unit is an active speaker. The internal amps are probably well tailored to the drivers. There are no losses due to speaker level cross-overs and no problems related to long runs of speaker cable.
🙂ensen.
I wouldn't call the Eons a Pro enclosure at all - maybe semi-pro. Made to a price, these things don't sound very nice (typical of plastic cabinets) and I doubt you would get 42Hz at only 3dB down - certainly don't sound like it.
There may not be losses associated with speaker cable runs, but the internal power supply certainly has some - transformer and filtering too small to cope.
If you want a small vocal PA for soloist etc, then fine - any more than that, then go to better gear.
Cheers
There may not be losses associated with speaker cable runs, but the internal power supply certainly has some - transformer and filtering too small to cope.
If you want a small vocal PA for soloist etc, then fine - any more than that, then go to better gear.
Cheers
The Eons are OK for what they are, MI range good buget PA speakers. As noted above the bottom end doesn't go that far down at power, the horn driver has the usual JBL harshness when driven hard, but for moderate volumes, they sound OK.
The active Eons are also just about the most impossible boxes to fix if anything goes wrong, the circuitry is simple enough, but taking them apart and putting them back together again afterwards need about 16 hands and a exact degree of 3D spacial awareness...😉
The active Eons are also just about the most impossible boxes to fix if anything goes wrong, the circuitry is simple enough, but taking them apart and putting them back together again afterwards need about 16 hands and a exact degree of 3D spacial awareness...😉
purplepeople said:
I don't doubt these can get loud enough to sound bad, just not at 42 Hz.
Those Eons are a real piece of work, the 15" driver's frame is part of the enclosure. Instead of being able to take the driver out for reconing you have to recone the box.
42 Hz is about the bottom for most pro subs. A very few subs can reach 30 Hz and only a handful can go below 30 Hz.
For example, the Lab Sub (a very nice pro DIY horn loaded sub) can reach 30 Hz, but only in groups of 4. http://www.prosoundweb.com/lsp
Phil
Sounds like JBL is giving up versatility for lower assembly costs. I predict it will be popular with the new-age pros.
Aside: The older pros actually know how to fix and mod their gear. Many of the young ones don't even know how manually bridge two amps - I certainly don't expect any to know how to replace a driver. Doesn't bode well for the audio industry as a whole. The best operators also know how their equipment works - race drivers, computer programmers, astronauts, photographers. Sound tech should be no different.
🙂ensen.
Aside: The older pros actually know how to fix and mod their gear. Many of the young ones don't even know how manually bridge two amps - I certainly don't expect any to know how to replace a driver. Doesn't bode well for the audio industry as a whole. The best operators also know how their equipment works - race drivers, computer programmers, astronauts, photographers. Sound tech should be no different.
🙂ensen.
Not Bad, But Not Fantastic Either.
"The Eons are OK for what they are, MID range good buget PA speakers. As noted above the bottom end doesn't go that far down at power, the horn driver has the usual JBL harshness when driven hard, but for moderate volumes, they sound OK."
A mate of mine has a pair that live in his living room, or in his factory.
They do not go particlarly loud on full range music, are not particularly clean, and don't really do it for me.
For vocal only PA they work well enough, but don't give them any serious bass.
These are is a nice concept, and the name badge looks good.
Eric.
"The Eons are OK for what they are, MID range good buget PA speakers. As noted above the bottom end doesn't go that far down at power, the horn driver has the usual JBL harshness when driven hard, but for moderate volumes, they sound OK."
A mate of mine has a pair that live in his living room, or in his factory.
They do not go particlarly loud on full range music, are not particularly clean, and don't really do it for me.
For vocal only PA they work well enough, but don't give them any serious bass.
These are is a nice concept, and the name badge looks good.
Eric.
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