Tweeter Waveguide on and Pointed at Windscreen or no Waveguide and more on axis?
Posted 24 March 2012 - 08:15 PM
If I remove the waveguide I can rotate the tweeters and have them more on axis, which do you think would be better, would I have massive cancellation issues if they were aimed at the windscreen.
I have no TA if that makes any difference.
Posted 25 March 2012 - 12:45 PM
On axis will probably give you better/sharper imaging, staging, micro dynamics and transparency.
It will however, result in a loss of some ultimate stage depth and perhaps width. You'll still get good layering but in most on axis systems I have heard, the stage will be moved forward towards you and will initially appear to not be as deep. This is not a bad thing though as this is how many 'good' home systems present things anyway.
Off axis with some form of guiding (windscreen, pillars, dash, etc) will probably net a wider and deeper stage but may also result in the loss of the things you'd gain when in an on axis set up (the micro dynamics, image and better performer placement, etc).
I'd also suggest that you have a play with relative (compared to the next driver down) phase on the tweeters if you run off axis and waveguided. You have said you have no T/A so try just switching the tweeter wires around so they would play 180 degrees out of phase. You may like what this does and it may work, but then you/it may not. Suck it and see I say.
With those things in mind, you'd really have to simply try each position and based on your values, make a call as to which arrangement is best in your car and matched to your liking/taste.
Past systems I have built have used a guided/off axis set up to one degree or another. I've liked what they achieved but felt that I wanted to improve in other areas. This time around though, I am attempting an on axis (well, close enough) set up. Depending on how this goes, I may still use either some rear fill, or off axis small format 'ambient' tweeters (modded Vifas, Scans, or Seas) to give me the best of both worlds.
Edited by Winno, 25 March 2012 - 12:54 PM.
Posted 26 March 2012 - 09:51 AM
Off the top of my head I can't recall if those are the mini or full size versions? The waveguide is definitely more pronounced on the minis if that makes any difference.
This may buck the norm but if you don't have TA you may find the system more "pleasant" in terms of imaging with the tweeters even slightly off axis - ie deliberately sacrificing image focus if it's not going to be accurate anyway. You may find you can get decent imaging though. Time to have a play!
Posted 17 April 2012 - 11:16 PM
After putting decent gear in to my S60 and getting sub par SQ I decided to put the pods closer to the windscreen and have some sort of waveguide on the face of the pods to give untested speakers a chance at sounding OK.
As it turns out they sound amazing, I think I have a slight hump in output at ~4kHz and time alignment would definately help but for what it is the quality is 100% better tan expected.
Posted 20 July 2012 - 05:33 PM
It will be covered with speaker cloth soon but I would like opinions about the radius in front of the tweeter.
Is it fine as is or could I benefit from enlarging the hole or making it a more gradual radius?
Edited by ubernoob, 20 July 2012 - 05:33 PM.
Posted 20 July 2012 - 10:24 PM
maybe abit of pshyc-oaccoustics ---- or maybe something to toy with
Edited by lock_monkey, 20 July 2012 - 10:24 PM.
Posted 21 July 2012 - 08:08 AM
Posted 22 July 2012 - 10:05 AM
As Simon suggested, that profile is something that speaker manufacturers tweak and adjust ever so slightly to refine it for years (or extensive pre-production modelling).
Posted 22 July 2012 - 11:13 AM
I am just a bit hesitant to remove material as putting it back will be difficult.
Posted 22 July 2012 - 04:28 PM
hence +1 on mounting the tweeter on surface or even better crossing it above 6Khz, so its minimising the essential frequencies that steer/guide the stage. let your mids do that!.
Posted 22 July 2012 - 05:12 PM
I may have to space the tweeter out slightly to get it to sit at the right height.
Apologies for the poor phone pic, the beat up speaker and, oh and the lazy trim job
Edited by ubernoob, 22 July 2012 - 05:12 PM.