ResoNix Sound Solutions - Helix DSP Tech Tip: Differential Rear Fill, & Using Real Center
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- čas přidán 15. 07. 2024
- Hey everyone. Markus requested a how-to video on setting up differential rear fill in the Audiotec Fischer DSP Software, and I figured I would also throw in a little tip on getting more out of the Real Center feature that uses a similar technique to remove center content from your side speakers.
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I love these tutorials and info for the Helix DSP's.
I have two of them for 2 cars that I have and have to make... as soon as I have some time finally.... It sucks having good ideas, nice stuff and no time to build it...
And this will help a lot as soon as I have it installed.
Awesome video bro. Great job. And thank you so much for taking your time to make the. Video bro.
Great info and thank you for taking the time to share this information...
I use to do that style of Differential Rear Fill but then started to experiment with summing the Virtual Center out of phase into the Left and Right Rear Output Channels and found that offered me what i was trying to achieve
To chime in about the slopes, there is a good difference in them all. 24db linkwitz is the easiest and most protective and also doesn’t require a polarity switch, it also makes the handoff between speakers sharper which can make the sound a bit more edgy, so the blending is not as great especially when the speakers are not within a few inches of each other. 12db linkwitz requires the polarity of the mids to be reversed from the tweeter and midbass, but it offers a much better blend than 24db and has a much smoother sound overall. And if you want the best blending you can do butterworth 6db slopes. It offers the least protection for lower frequencies but you will be harder pressed to notice which speaker are playing each frequency. This is a great method especially for speakers off axis because they will work better together and provide a much more dynamic presentation. The only way to really know the difference between slopes is to EQ each speaker’s full bandwidth and then set your crossover’s afterward your EQ’s are set.
How about on a 2 way active front, any polarity changes there?
@@LuckyyTheDogshould be able to flip back and forward bro 180 or 0 id do it with only the one channel running though. That's not a technical thing it's just by ear I can tell phase generally, some phase issues aren't avoidable due to nulls in the car too.
Sound weird though. I have helix .3S dsp but the quality with the head unit is better as compared to audio quality and clarity from dsp coax input while playing from a digital audio player. Your inputs will be really helpful.
what headunit is it? aftermarket?
Is the only reason for a center channel a 2 seat tune? I have a helix dsp.3, and a factory spot for a center and would like to try it. I dont care about 2 seat, and wont have any rears. I will be running a 2 way front, will there be any use for a center in a setup like that?
Can I install a riven to a v8 mk2 by going hi level in to the v8 then rca output to the riven then rca input back to the v8? Whole reasoning for this is for the adep functionality off of the factory radio and to be able to use the hec bt hd card.
For the center channel, are you crossing them the same as your midranges or higher for lets say a wideband in that position?
It must match in order to match the frequency and phase response.
@@ResoNixSoundSolutions
Thanks! Appreciate the info and response.
Maybe i missed it in the Video, but:
I have KX3 3-way in front active, and some Focal K2 comp speakers as rear.
I use mic with the ATM in Helix. Should i use the ATM before or after i set up rear fill.
Only ATM sub and front set, then set up rear fill - Or ATM front set, sub AND rear fill?
Thank you!
Do delays first, then do measurements and EQ, then set up differential signal. Have ATM do all of it.
@@ResoNixSoundSolutions Thank you!
I found that the AutoEQ didnt really do any good, the sound was much better and more detailed without any eq.
I havent tried tuning each speaker alone with Autoeq - will try that before i give up =D I tried som guide who said to link each side and tune, but the result sucked and i thought the whole idea was both wrong and weird.
Thanks again!
@@ResoNixSoundSolutions Do you use corrolated when tuning each speaker?
Could you show us how to set levels for rear deck speakers to retain a front image?
Please
Much appreciated
No tweeters in the rear is the most important thing.
When you set your EQ’s, dont adjust the levels. Literally just use your EQ to get them all matched and make sure all your mid ranges are crossed the exact same. Once your time alignment is set any speakers in the rear should add presence to the front rather than drawing you to the rear. And with rear fill in differential mode it shouldnt pull your vocals anywhere because the information is different than your fronts. I run my rear fill hot even when i have them olaying the same information as the fronts. It just gets louder but doesnt sound like its in the back of the car. So play with rear levels after you’ve got all your speakers eq matched. It should boil down to your taste as long as the tuning is proper.
@@JayeBasswhen you say you run them ‘ hot’, I thought you said you have the levels of the rear speakers -8 or more db.
So the rear speakers should be lower in volume or the same as the front speakers?
I’m confused.
Thanks again
Can rear fill be done from only 1 chanel on dsp as thats what I have left? I have been told it can be done but looks like you are using 2 chanels there..😏
So it *can* be done, but not in a way that would be considered ideal. What you would do is do Left minus Right on the input signal, and then you would flip the speaker wire polarity on the right speaker. Problem is, no independent signal delay, eq, or levels, which can definitely throw things off.
12db is smoother. There is a difference 😁👍