I'm waiting for him to develop that into a line array of 5MRs and UM18's 
Has anyone else tried the treble notch filter from earlier? Keen to hear what you guys think
Has anyone else tried the treble notch filter from earlier? Keen to hear what you guys think
anyone tried to combine this tweeter to prv? seems good candidate and cheap with high power rating and sensitivity
Peerless by Tymphany H25TG05-08 1" Titanium Dome Tweeter with Waveguide 8 Ohm
Peerless by Tymphany H25TG05-08 1" Titanium Dome Tweeter with Waveguide 8 Ohm
I have 4-PRV drivers and was thinking of using a tweeter with them in a “full tweeter full” arrangement, I honestly don’t need a tweeter above them as I’m not hearing above 16k I thought perhaps using one would give a specific source.
I don’t know, I have other projects going that need finished first.
Oohms;
I’m currently using a notch filter at 7500 in My living room, it really helps them play better with others!
I don’t know, I have other projects going that need finished first.
Oohms;
I’m currently using a notch filter at 7500 in My living room, it really helps them play better with others!
I have auditioned my Fostex T90A to several friends whose curious about the benefit of super tweeter on high efficiency fullrange like fostex/audionirvana. all of them says there is a significant airyness with/without it, for me it's the same case with PRV
this one from prv seems better but double price of vifa
PRV Audio TW700Ti High Power Titanium Bullet Tweeter 8 Ohm
this one from prv seems better but double price of vifa
PRV Audio TW700Ti High Power Titanium Bullet Tweeter 8 Ohm
It works very well on a horn as I found out. The horn gave about 10dB gain for circa 105dB at 2.83v. 28.3v is is 10x more voltage and 100x more power or +20dB. So 125dB sounds about right. Make sure you wear ear plugs when doing frequency sweeps. It plays so clean and loud you can’t tell that it’s loud. But my ears were ringing afterwards.
my mind drifts towards silly things - look at a 0.36 scale Cerwin Vega EL36/Afterburner type loaded with 6MR500. Not hi-fi - C-fold might not be good either for neutrality - but its loud for something about 13.5"x13.5" x 9" . Beta6a would work too and 100uF makes an effective highpass - - wonder if such a thing would compete with emergency vehicle "howler" speakers ? - think those are BP/resonator.
Beta6a is cheaper plus would be a shame to waste a wideband 6 in such a thing
Beta6a is cheaper plus would be a shame to waste a wideband 6 in such a thing
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Hello fellas!
I ordered some tweeters to play with;
Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm
I also ordered two prv-6mr500 drivers to create a center channel using the tweeter in the middle.
My thoughts are to have the left and right speakers 450 tweeter 450 all vertical and the center 500 tweeter 500 horizontal with the tweeter in the upright position.
I’m using DSP for crossover and equalization, My thoughts are to overlap the drivers so similar to a line array but use a high shelf for one and low shelf for the other where both are covering the same frequency.
*What do You think?
*Is My idea crazy?
One more question;
*How big a baffle would I need to be usable down to 300hz with the prv450s?
Surly there’s a calculator somewhere?
I ordered some tweeters to play with;
Dayton Audio AMTPRO-4 Air Motion Transformer Tweeter 4 Ohm
I also ordered two prv-6mr500 drivers to create a center channel using the tweeter in the middle.
My thoughts are to have the left and right speakers 450 tweeter 450 all vertical and the center 500 tweeter 500 horizontal with the tweeter in the upright position.
I’m using DSP for crossover and equalization, My thoughts are to overlap the drivers so similar to a line array but use a high shelf for one and low shelf for the other where both are covering the same frequency.
*What do You think?
*Is My idea crazy?
One more question;
*How big a baffle would I need to be usable down to 300hz with the prv450s?
Surly there’s a calculator somewhere?
That makes sense!
I’ve been playing with expanded PVC and polyethylene sheet as well, both materials cut well with a router.
The expanded PVC can be heated and formed, perhaps curving the baffle like I see in high dollar line arrays...
First things first... FOAM-CORE and listening!
I created a test baffle with an old cabinet door just to see how the drivers perform in this arrangement.
ABSOLUTELY HORRIBLY!!!
I expected the tweeter to have a narrow vertical pattern but with the MR6-500s on the sides they destroy the horizontal as well.
There’s no need to get a microphone out, the 6” versions of the PRVs are completely different animals and absolutely require a tweeter above them.
I have My heart set on using the AMT tweeters, I just need to find the best combination to implement them.
I wish the horn and baffle computer programs weren’t so confusing, I could probably eliminate a lot of cutting/testing.
Attachments
It has been some months when i've build my PRV horns but this weekend I had the chance to take everything outside and get some measurements.
There is one wooden surface that could reflect some things but it is on the side at a few meters distance so the mausurements altough not perfect can still be used.
The microphone is calibrated at the spot using a calibrator so the dB values are correct.
I however didn't measure the voltage going to the speaker.
So first the raw response of the horn loaded PRV 5MR450 with a wooden tractrix horn, Hi pass at around 200Hz
at around 2kHz it dips a few dB but doesn't really drop off.
So after a little bit of EQ this was the result.
The HP is at 200Hz where some 15" folded horns take the rest
Didn't EQ the high end ripple so it's not perfect but it goes from 200Hz to around 15kHz.....
Last but not least here is the prv horn in combination with the 15" folded horn after time alignement was adjusted.
Doesn't look to bad I think
There is one wooden surface that could reflect some things but it is on the side at a few meters distance so the mausurements altough not perfect can still be used.
The microphone is calibrated at the spot using a calibrator so the dB values are correct.
I however didn't measure the voltage going to the speaker.
So first the raw response of the horn loaded PRV 5MR450 with a wooden tractrix horn, Hi pass at around 200Hz
at around 2kHz it dips a few dB but doesn't really drop off.
So after a little bit of EQ this was the result.
The HP is at 200Hz where some 15" folded horns take the rest
Didn't EQ the high end ripple so it's not perfect but it goes from 200Hz to around 15kHz.....
Last but not least here is the prv horn in combination with the 15" folded horn after time alignement was adjusted.
Doesn't look to bad I think
I'll see what I can do in a few days. I used REW so waterfall and impulse response should be possible.
The group delay and the excess group delay function is also a nice feature to use for time alignment and also to look if the phase is not to far off and has no weird peaks & dips etc....
The raw speaker is more difficult as I would have to open up the speaker etc....
The group delay and the excess group delay function is also a nice feature to use for time alignment and also to look if the phase is not to far off and has no weird peaks & dips etc....
The raw speaker is more difficult as I would have to open up the speaker etc....
That’s a very nice response - should sound fantastic. I love the sound of this driver in a tractrix. One of the best sounding speakers I have ever heard - the clarity is astonishing as the cone movement is in the tens of micrometers and hence, distortion is very very low. Integrated with a bass horn is the best way to do this.
Very impressive setup. Photos?
Very impressive setup. Photos?
Will guess you right there that horn loaded probably is one of the best sollution when a relative big diameter mid driver is used as tweeter : )
For interested xrk971 in past shared impulse response and 0/15/30/45 degree axis on a trapezoidal baffle and Nautaloss rear chamber over here: https://www.diyaudio.com/forums/ful...n-4in-class-range-drivers-21.html#post4234001.
Why i guess xrk971 is right about horn loading helps improve tweeter band is seen below using those 0/15/30/45 degree axis from above link into simulation using free VituixCad.
In below 5MR450-NDY at 0 degree axis is EQed smooth as a pancake for a 300-20000Hz BW2 bandpass seen as the grey curve, design axis (listening window) is at 0 deg and we could hope for we listen to some delicate smooth response but sadly forget about that dream other than near field on design axis because look at the mess at the other three curves, a less diameter driver or real tweeter will help improve tweeter band and run over 5MR450 used as direct radiator tweeter or use a horn solution as xrk971 talked about to smooth out that tweeter band area.
Here is normalized view for above 0 degree as design axis.
5MR450-NDY at 15 degree axis is EQed smooth as a pancake for a 300-20000Hz BW2 bandpass seen as the grey curve, design axis (listening window) is at 15 deg and we could hope for we listen to some delicate smooth response but sadly forget about that dream other than near field on design axis because look at the mess at the other three curves, a less diameter driver or real tweeter will help improve tweeter band and run over 5MR450 used as direct radiator tweeter or use a horn solution as xrk971 talked about to smooth out that tweeter band area.
Here is normalized view for above 15 degree as design axis.
5MR450-NDY at 30 degree axis is EQed smooth as a pancake for a 300-20000Hz BW2 bandpass seen as the grey curve, design axis (listening window) is at 30 deg and we could hope for we listen to some delicate smooth response but sadly forget about that dream other than near field on design axis because look at the mess at the other three curves, a less diameter driver or real tweeter will help improve tweeter band and run over 5MR450 used as direct radiator tweeter or use a horn solution as xrk971 talked about to smooth out that tweeter band area.
Here is normalized view for above 30 degree as design axis.
5MR450-NDY at 45 degree axis is EQed smooth as a pancake for a 300-20000Hz BW2 bandpass seen as the grey curve, design axis (listening window) is at 45 deg and we could hope for we listen to some delicate smooth response but sadly forget about that dream other than near field on design axis because look at the mess at the other three curves, a less diameter driver or real tweeter will help improve tweeter band and run over 5MR450 used as direct radiator tweeter or use a horn solution as xrk971 talked about to smooth out that tweeter band area.
Here is normalized view for above 45 degree as design axis.
Attachments
Thanks for those simulations, Byrtt. I think they match the hash we see in the measurement a near 10k. But as I recall, it doesn’t sound too bad in reality. Sounds quite nice actually and probably not as rough as the simulations are predicting.
From Vintage Audio (above):
I concur!
They sound absolutely phenomenal to Me, they’ve replaced 2-pairs of JBL6208 studio monitors I’ve been listening to the past 15+years “currently one set is collecting dust in My storage locker”
I enjoy their sound so much that I’m trying other new combinations!
The studio monitors are as flat as it gets but they sound like You’re listening to the speakers rather than a performance.