PSA about the Helix amp and aftermarket speaks... but first a quick intro. I am the dude who made the original Helix install video. WAVE 👋🏻. I came here because I am putting my old Helix sub in my wifes new 2019 e-Golf SEL and needed some info. Good news is it fits. 👍🏻 The trunk is like the R - Shallow, because of the battery packs, but it still drops in. Anyway, I was about to post the same thing before I read the response from ATF. I actually contacted them about the very same issue because I upgraded my front woofers for the F--k of it and instantly regretted it. I added some Rockford Fosgates with MASSIVE Magnets, because go big or go home, right? Ya, wrong.
Day 1 : My sub stops working.
Day 2 : The speakers shut off randomly.
Day 3 : My whole amp starts smoking and I fry it. 🤬😭
Another forum member I spoke with upgraded to the Focal ISS 166's you guys mention here (Much smaller magnets, correct RMS/Peak range and correct @4 Ohms) and his amp STILL started exhibiting the same issues. (More on those later) . Luckily he swapped back to the OEM speakers before he blew his amp.
I have since been on an epic audio upgrade quest and learned a LOT. The Helix amp is VERY sensitive to Ohms and watts (Both RMS and peak), the sound is also custom designed for our cabin, speaker type, speaker placement, and exactly where you sit. In short I would NOT upgrade your speakers. The stock Tweeters are a very capable silk dome tweeter that softens the very cold, clean sound of the Helix amp. Together they create a perfect sonic harmony. (Like salted caramel, on their own salt and caramel are a bit too much, but together they compliment each other very well) The Helix takes an otherwise unremarkable tweeter and cleans up the sound making it far more detailed, but still warm and very well balanced. Matched to the ISS 165 or 166's and you are going to find yourself In a place I like to refer to as "Ear Fatigue City". Are the Focal ISS 166's amazing? Yes. I upgraded to them with a Helix P6 MKII Pro amp (With a Mono amp for the Sub, more on that later) and I can literally hear the spit inside signers mouths. It's kind of gross and awesome at the same time. They are THAT detailed. The clarity of the inverted aluminum dome is amazingly clear but can be too bright (I wouldn't go as far as to say tin-ey) , but if you go that route you will need a full DSP like the Helix Pro Six MKII in order to tame harsh frequencies using a special mic and a program like REW. Helix has done all this for you. They literally record the sound in the card and edit the response frequency for those speakers and your car (Thus the different profiles). You can find videos of this process on youtube.
I know a lot of this is nothing new to some of you but for some (Like myself last year) you don't know what you don't know. Helix engineers also used time-alignment to set the drivers speaker position so the sound stage's stereo field is correct for your seating position. This is huge. It might sound like crap from the passenger seat but who cares bout them really. 😂 Without TA the sound is muddy and coming from nowhere in particular. With it, the signer is in the middle and the band is in different places in fron of you - not only to the left and right, but closer and further away in virtual space. Add to that active crossovers to the in cabin speakers so the Helix Sub in the trunk can take over bass duties and you can push the paper door woofers harder and louder without distortion. This is why the Helix amp is SUCH A GOOD VALUE. I cannot stress this enough. The system I replaced it with is only slightly better and cost 3 grand. I would say be happy with it AS-IS and leave well enough alone. Once you start tinkering you start to concentrate more on why something sounds the way it does, you can't just enjoy the music and becomes work. An example of this, is you may want more bass out of the mid woofers, but as soon as you do that your doors become a rattle-fest. (Ask me how i know 😉 ) Now you're chasing down rattles everywhere. Add to that the JL Audio 10" i got that hits so hard it makes my vision blur (I'm not kidding 😂) and you will find every buzz-able plastic connection in our cars. I fell like the Helix didn't do this at all. You may also concentrate on why something didn't sound quite as good as the Helix and why now your ears hurt after 5 minutes of moderate volume listening.
Despite all my warnings, my system does sound awesome now, and I had a lot of fun doing it but it's probably not worth it for 99% of you. And it took a lot of work to get there. Like... My family wanted to divorce me. LOL
I want to do a build thread on it because I have lots of pics and video as I documented the whole thing for those that still want to venture down that path, but that's going to take a while to edit together. In the meantime I'll post up picks of my install, and am happy to answer any questions. Thanks, nice to meet you all (First post here, (Go big or go home 😉) I've been on VW Vortex for long time) 👍🏻