Re: JBL 308P and 708P
Posted: 2022-01-19 17:29
https://www.lejonklou.com/forum/
One interesting thing with 708I is that maybe JBLs filter settings are not the most musical. With a variable filter, it might be possible to tweak them to perfection.ThomasOK wrote: ↑2022-01-19 23:28 A little while back there was a question or two about the passive version that needs an external electronic crossover and amps. Although I'm sure it would be very cool if Fredrik came out with an electronic crossover for it I wouldn't hold my breath. The complexity of building an electronic crossover and the need to make it specifically for the 708 would argue against the economic sense and spending the effort on such a device. Making is general purpose device would require much more complexity and might not allow the kind of perfromance Fredrik achieves with all of his products.
However, there is a possibility if some brave soul wants to try it. The Marchand XM44 crossover I used with my JBL 3677/4645C setup as a subwoofer crossover is available in 1, 2, 3 or 4 way versions a section of which can be for a subwoofer with summing if desired. While I don't expect it would be near Lejonklou level I was quite happy with it for my subwoofer as were several other people who bought them from me for the same purpose. It also has some interesting advantages that might make it suitable for the 708s where other crossovers might not be. First you can order the crossover points at any frequency from 20Hz to 20kHz, then you can order any slope from 6dB to 48dB per octave in 6dB increments. They can also be asymmetric if needed. But that is just the frequencies. Each section has three card slots which allow for other options such as notch filters, delay sections, baffle step compensation, etc. So if you can find out the exact crossover specs from the 708P it is highly likely Phil Marchand can duplicate them. The pots for volume adjustment are stepped attenuators are normally 1dB per step but can be ordered as .5dB per step for an additional charge. The prices are also pretty reasonable. Here is a link for the model I used and a US price list is also on the website.
https://www.marchandelec.com/xm44-elect ... sover.html
It at least seems like it might be an option, but that depends on how complex JBL made the crossover and what they did in it.
That's an interesting link: for € 149,- my IKEA Symfonisk Picture Frame seems to be doing quite well ;-)Lego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
Indeed,which reminds me did you manage any skiing this season Tendaberry :0)Tendaberry wrote: ↑2022-01-20 17:03That's an interesting link: for € 149,- my IKEA Symfonisk Picture Frame seems to be doing quite well ;-)Lego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
https://pierreaubert.github.io/spinoram ... ture+Frame
I dont give much to those measurements but if I would I would say the 308 got too good so it might be cannibalized the more expensive lines so JBL rather optimized that and came out with the 308 MKIILego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
Have a look at the curve of the M2 😳Lego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
V-fib?!?Azazello wrote: ↑2022-01-20 22:32Have a look at the curve of the M2 😳Lego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
Yes saw that ...those pesky amps 😁Azazello wrote: ↑2022-01-20 22:32Have a look at the curve of the M2 😳Lego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
That's a very nice conspiracy theory Defender 🤠Defender wrote: ↑2022-01-20 22:12I dont give much to those measurements but if I would I would say the 308 got too good so it might be cannibalized the more expensive lines so JBL rather optimized that and came out with the 308 MKIILego wrote: ↑2022-01-20 15:39 This is Spinorama data for JBL308 vs JBL 308 mark IIs
Seems to concur with Jajo's impressions
https://pierreaubert.github.io/spinoram ... 8P+Mark+ii
They do look different. 308P looks/feels cheaper but less "boxy" and "PRO". I like them both but prefer the CF driver and bass driver of 708P. And the weight.
I was referring to the SPINorama traces for LSR308 & 708P - fun, but made me wonder how much you can/should read into the measurements...
I've only heard 2 speakers on there, the 308s and the Kef reference 5s .The Kefs sounded terrible and maybe it's a coincidence they measured badly.Different setup and track,not ideal but here's Reference 5tokenbrit wrote: ↑2022-01-21 05:03I was referring to the SPINorama traces for LSR308 & 708P - fun, but made me wonder how much you can/should read into the measurements...
Well, my foot started tapping to the 308's, not to the KEF's though. Easy choice...Lego wrote: ↑2022-01-21 07:24 I've only heard 2 speakers on there, the 308s and the Kef reference 5s .The Kefs sounded terrible and maybe it's a coincidence they measured badly.Different setup and track,not ideal but here's Reference 5
https://drive.google.com/file/d/14Ibb-b ... p=drivesdk
JBL 308s.
https://drive.google.com/file/d/1U391uI ... p=drivesdk
Ventricular fibrillation?
Have you tried turning the bass down ?Defender wrote: ↑2022-01-21 14:43 Jajo you say most bass problems come from non perfect positioning of speakers.
What is your experience when you have a „seem to be perfect“ distance from the wall which is very musical but bass boomy. Is there another distance from the wall which is musical but without the bass boominess? Or does the bass boominess might go away with finding another distance between them. I also found already a very musical distance between them but it still has bass boominess.
Did it happen to you that you found more than one quasi sweet spot?