I’ve got everything in and powered up. So far I’ve been unable to get my laptop to “connect” to the DSP4086. Disabled firewall for the program, used JBL’s USB cable, installed driver before program, etc. Still no joy. JBL tech has an open case for me to help solve. Until then, my Alpine ILX-407 has its own built-in suite of signal adjustments. Using those for now I’ve got a listenable system. Until I can get it to “connect”, my JBL DSP4086 is serving as a basic 4-ch amp I guess out of the box.[Re: JBL DSP4086] That is a pretty impressive DSP for what it is. Only thing I think it is missing is an RTA.
With passive crossovers you cannot do time alignment of individual speakers, nor can you EQ individual speakers.
Time alignment is important, but above 1-2kHz you locate sound sources more via volume of the source and less via the phase difference due to timing mismatch. That's the reason people argue you can get away with no time alignment between midrange and tweeters, especially if they are crossed around 3k Hz or higher and the distance to the drivers ear is within a reasonable amount.
With EQ... well, if you got 30 bands of parametric EQ it should be enought to cover both midrange and tweeter.
That said i would always cross midbass to midrange/highs active and not via passive crossover as time alignment in this area is crucial for proper staging and imaging. Even moreso between subwoofer and midbass.
So for a 3-way front you could get away with a 4 channel amp and 6-channel DSP and run both midbass drivers active on channel 1+2 on the amp, midrange/tweeters on channel 3+4 with passive crossover and sub on a monoblock (or 5 channel amp) from channel 5(+6) (channels correspond with channels on the DSP).
I had the same issue with my D6.1200, it turned out to be a bad USB cable. There are some oddities where I had to manually install the drivers for it as well. These are amplifier / audio companies after all, not computer technology.I’ve got everything in and powered up. So far I’ve been unable to get my laptop to “connect” to the DSP4086. Disabled firewall for the program, used JBL’s USB cable, installed driver before program, etc. Still no joy. JBL tech has an open case for me to help solve. Until then, my Alpine ILX-407 has its own built-in suite of signal adjustments. Using those for now I’ve got a listenable system. Until I can get it to “connect”, my JBL DSP4086 is serving as a basic 4-ch amp I guess out of the box.
So if that is an 8" there is likely less than .5 cu ft in there. Guessing of course. Sealed enclosures can sound good however generally speaking you need a lot more power to push the driver since it has so much air resistance working against the motor. Personally I would get rid of it and build an enclosure for a single high end 8" or 10" woofer. You can build a pretty small enclosure that is ported which will make a huge difference.
I mean, how much does it hold. 13 liters eventually? I would eventually try to pull it out until that cover in front of it to win that space.
Good to know and thanks for sharing this info! I had seen a post on another Ford forum where someone did some frequency plots of the head unit output and there was indeed some bass boost being applied even after the Forscan change.Just an information for all the people doing the ForScan mod to disable EQ on their systems.
My system was a 12-speaker Shaker system.
That means variable line level from ACM to DSP-amplifier in drivers kickpanel.
I changed the amp to a DSR1 that is feeding a "flat" signal to a Mosconi Pico 8/10 DSP.
I even changed the ACM EQ settings to "00", i.e. flat signal/no eq.
That Mosconi has the ability to measure the electrical input.
So i measured the input to the Mosconi this morning (DSR1 EQ set to all flat, so no change in response there).
At volume lvl 30 the signal measured totally flat.
At volume lvl 3 the signal had an 8 dB bass boost at ~50Hz.
So if you work with an aftermarket DSP or DSP amplifier that measure that system at volume lvl 10 or so with pink noise... please note that you're loosing a bit of bass output when going higher than that due to the diminishing bass boost at higher volumes.
Does that DSP have the equivalent of AccuBass that AC uses?The Mosconi has an RTA. Will do a Screenshot next time i am working on my car.
edit: attached screenshot shows different measurements.
Vol 3 is with highest bass boost. Starting at Vol 15 it's basically flat.