Stickey - 'DSP' is the electronics industry shorthand for 'Digital Signal Processing' and you'll find allsorts of audio products that use it to a greater or lesser extent, both today and from over the last 2 and a bit decades. For the E39 specific application, it was to provide 'effects' like being in a Church, Jazz Club, Stadium etc, and whilst all the rage in the mid 90's, by the end of that decade it'd fallen out of fashion for those kinds of effects. The 'clone' cheap chinese type head units with 'badges' on from Xtrons, Enon, Pumpkin, Seicane, Erisin and so on don't have Time Alignment included - remember, they're simply cheap tablet electronics housed in that car specific chassis. The audio stages are generic so not all that good in terms of audio performance and capability and the difference is substantial when directly compared to a high quality brand head unit as I mentioned above in friends cars including E39's and M5's. I'm not suggesting that you need to go for a competition level of performance either - moreover, somewhere in the 'middle' so that you get an excellent blend of Money spent Vs performance AND functionality gained. Depending on which recognized car audio brands you use for the amplifier(s) and components speakers/co-axials/sunwoofers, then assuming you go 'middle level' on those, then they'll similarly not perform to what they're capable of when using a cheap quality chinese head unit, so my point is, you'll 'most likely' be disappointed in the short/medium and longer term!
Rontgen - As above there's no Time Alignment capability on this unit and other similar priced clone units. Also, these units don't 'directly' connect with the OEM 'DSP' amp as has been discussed on many threads over the years. There's some hacks/workarounds, so those will need to be done which just adds to the installation time and complexity. The Dynavin N6/7 was the only one until a few weeks/months ago which had the capability to connect to the OEM DSP amp. Lately, the Avin Avant 3 also promises this as well.
At the CES show and SEMA 2009/2010 I spoke to representatives of Xtrons as well as a few other Chinese 'brands' of car audio who were showing BMW specific models. I did ask about components and electronics and within a few minutes I was away from them all. I did think to become a UK importer/re-seller but quashed that idea quickly afterwards. Over the last 6/7 years, various companies have tried to be 'official' sellers of various brands - Dynavin, Eonon, Hualingan etc and within a few months they all either failed or decided to stop selling them. One brand did stay around for perhaps 18 months or so - called Andrive, but they stopped/folded too. In the US, Dynavin is properly supported and given after sales care, so I'd say purchase one of those. The Avin has come out with their Avant 3 and also had a US base for support so I'd say consider that as well. For those who want to take the gamble with the other 'clone' brands off Amazon or Ebay, then like so many other threads over the years - which turned to train wrecks quite quickly, then this thread is likely to go the same way. To be balanced, then 'maybe' Xtrons do indeed have a good, reliable, consistently performing head unit here.
Here's the Xtrons site - there's no mention of Time Alignment nor support for the OEM BMW DSP amplifier - Buy BMW 5 Series E39 Android Car Stereo | Xtrons
Lastly - Good luck to those who've taken the plunge or will be. If 'Xtrons' prove to be a good unit now and have proper reliable dealer support, then I'll definitely consider them to import to the UK officially for BMW owners here.
2003 Ex-Police E39 530 Diesel Touring. Alpine White, 260,000+ Miles & climbing!
19" Hartge Nova 5 - with custom painted 'Flash Chrome' centres & Polished Lips (set of 5)
19" Hartge Nova 5 - Awaiting custom re-finish (set of 4)
19" Hartge Classic - with custom powder coated centres in shadow chrome & diamond cut/no lacquer lips (set of 5)
20" Hartge Classic - Awaiting custom re-finish
19" 3Pc Forged wheels - ID retained until re-built & finished (2 sets)
20" 3Pc Forged wheels -ID retained until re-built & finished
19" Centres - ID retained until rebuilt & finished
Full Custom Audio install - Arc Audio KS Mini ampliifers. DLS 5.25" 2 way front components & 4" 2 way co-axials. JL Audio 8W3-V3 subwoofer in stealth enclosure. Parrot Asteroid Smart head unit, custom door builds for DLS front stage & Earthquake SWS6 flatline subwoofers, custom rear pillar speaker pods. LumiDock iPod dock,
H&R Springs, ExoticsTuning front lip spoiler, Sport F/R bumpers upgrade, Carbon Fibre effect printed Vinyl roof wrap, High gloss black vinyl window trim wrap, Hartge bonnet/hood & tailgate badges, rear rooftip spoiler, matt Black kidney grille, projector foglamps.
Hartge auto gearlever, Hartge Handbrake handle, Hartge door sill strips, E46 M3 CSL Alcantara/Tri-stitch SMG steering wheel, full Black Leather Sport seats,
Custom ECU re-map biased for more Power & Torque in Steptronic mode, EGR delete, K&N induction kit, Stainless steel de-cat, Stainless steel exhaust backbox with twin oval pipes. Manual 5 spd gearbox conversion.
Plenty more modifications to come!