The question is really how much you want to adjust your sound. I would assume the harness available from Match is functionally (if not physically) the same as the one that comes with the Helix.
It taps into the power going to the head unit. It takes the speaker output from the head unit, applies equalization/time correction then sends that back through your factory wiring. Completely reversible. All of which you probably know.
The tuning for the Helix has already been performed for different VW applications (57 for the 4 door Golf). It is tuned for the space and more importantly (in my opinion) for the stock speakers in the car.
If you intend to upgrade speakers the Match may be a better choice. Also you can't "adjust" the Helix with the dongle. You can try the programming for different vehicles to see if you prefer how it sounds. Most seem to settle on the programming intended for the Golf.
If you're the type that would tune until you "get it right" and stop the Helix will probably satisfy you. If you tend to tinker forever the Helix flat out doesn't allow it.
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Thanks that was super informative and helpful!
I highly doubt I'm the type to tinker with much at all, seeing as the idea of this installation alone seems a little overwhelming.
However, it seems like not much of a gamble to assume that the sound setup provided on Audiotec-Fischer's website for the Match PP 62DSP (52DSP isn't listed) for a 5-door Golf VII and their very similar to the Helix subwoofer in the PP 7S-D has got to be a pretty similar setup to the programming of the Helix tuned for Golf VII, right?
In which case it seems I'll get the best of both worlds by sticking with the Match without any additional hassle as all it takes is sticking that downloaded sound setup onto a microSD card and then putting that card in the Match Amp.
Anyways I'll try the Match and post to let folks know how decent it sounds and then just unplug that amp and try the Helix before shipping one back so everyone knows if the sound and setup is really that different for either one.
Thanks!