My experience has been with TA2020, the lower power variant popular in the Lepai amp. Many folks including myself whom have listened to Tripath TA20xx vs the TPA31xx agree that the TPA is better. It is newer technology and subjectively the differences are better clarity, sound stage and imaging, more transparency and more articulate bass. However, a modded TA20xx can sound better than a stock TPA31XX. But a properly modded TPA31XX will always sound better than a properly modded TA20XX. You should ask this in the Class D forum in the TPA3116D2 thread if you want a wider audience base to provide feedback.
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp.html
The mods are not expensive or extensive: qnty 2 330uF 25v SEPF OSCON caps, qnty 4 ceramic 220nF 50v bootsrap caps, qnty 4 330pF 50v ceramic bootstrap snubber caps, qnty 4 10ohm 1/4 watt bootstrap snubber resistors, qmty 2 3.3uF 250v input caps. About $10 total.
I guess this is getting OT but if you have more questions about TPA31XX amps please post questions in the above thread link.
http://www.diyaudio.com/forums/class-d/237086-tpa3116d2-amp.html
The mods are not expensive or extensive: qnty 2 330uF 25v SEPF OSCON caps, qnty 4 ceramic 220nF 50v bootsrap caps, qnty 4 330pF 50v ceramic bootstrap snubber caps, qnty 4 10ohm 1/4 watt bootstrap snubber resistors, qmty 2 3.3uF 250v input caps. About $10 total.
I guess this is getting OT but if you have more questions about TPA31XX amps please post questions in the above thread link.
Xrk, can I get the plans for the tractrix horn? I'd love to try those with my W5-1611s before I give them away.
Plans are in the Trynergy thread. Should be interesting to see how they work with the W5's.
Interesting driver the PRV 5MR450-ND i did read most of this thread, but i cannot find measured Thiele Small Parameters beside's the one provided by PRV. Are there independent TSP measurements?
I never measured it (my sound card blew its inputs). The values seem reasonable as measurements are close to sims.
Ok, good to know! Thanks for the THD measurements, looks like one of these seldom stiff suspension drivers usable for backloaded horns.
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Mass-damped Hypercube with 5MR450NDY
I just made this enclosure using the Hypercube with added mass damping on the panels. Sounds really nice.
http://www.diyaudio.com/forums/full-range/265053-hypercube-loudspeakers-27.html#post4134697
This is response and harmonic distortion without any stuffing at all inside! A hollow cabinet:
I just made this enclosure using the Hypercube with added mass damping on the panels. Sounds really nice.
http://www.diyaudio.com/forums/full-range/265053-hypercube-loudspeakers-27.html#post4134697
This is response and harmonic distortion without any stuffing at all inside! A hollow cabinet:
Yes very cool build but sadly the link http://www.diyaudio.com/forums/full-range/265053-hypercube-loudspeakers-27.html#post4134697 in meantime closed for new activity 🙁.
Don't do it xrk971 for my curiosity (give you work load) but if you sometime happen to measure this box when it's stuffed/damped be nice if you publish it, imagine sound maybe could change to something ala more headphone like than your description the other thread as being "open".
225 watt and high sensitivity as you said over there could be a great on stage monitor.
Don't do it xrk971 for my curiosity (give you work load) but if you sometime happen to measure this box when it's stuffed/damped be nice if you publish it, imagine sound maybe could change to something ala more headphone like than your description the other thread as being "open".
225 watt and high sensitivity as you said over there could be a great on stage monitor.
I didn't know it was closed over there. It is sad that the thread was closed as I think it was quite popular and some good stuff was discussed. Some people who never contribute anything but annoying personal attacks have to ruin it for the rest of us.
I will put stuffing in and measure again to see if there is a difference. In the meantime I came up with a simple 2nd order passive line level XO to integrate these Hypercubes with a sub at 200 Hz. Sounds really nice - will have to get some sound clips soon.
Here is a photo of the PLLXO for the sub - about 200Hz. Costs less than $2.
Mass damped inner panels:
Assembly:
Almost done:
Phase response:
Impulse:
Compared to TC9FD Hypercube:
I will put stuffing in and measure again to see if there is a difference. In the meantime I came up with a simple 2nd order passive line level XO to integrate these Hypercubes with a sub at 200 Hz. Sounds really nice - will have to get some sound clips soon.
Here is a photo of the PLLXO for the sub - about 200Hz. Costs less than $2.
Mass damped inner panels:
Assembly:
Almost done:
Phase response:
Impulse:
Compared to TC9FD Hypercube:
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Back to Nautaloss...
After playing around with the Hypercube and HyperFAST, and the AMT - I just cleaned up the speaker lab and put the 5MR450NDY's back on the stools, re-loaded the DSP script in the miniDSP, and here I am back to a favorite. With a sub woofer filling in from 30Hz to 170Hz, these sound fantastic - and reminds me why it is still one of my favorite setups.
This is what the room looks like again:
The sound is very clear with great imaging and lots of headroom for dynamic passages. 😀
Something to be said about a simple full range driver in a sealed IB cabinet.
For some reason, REM's song "Don't go back to Rockville... and waste another year..." keeps playing in my head. 🙂
After playing around with the Hypercube and HyperFAST, and the AMT - I just cleaned up the speaker lab and put the 5MR450NDY's back on the stools, re-loaded the DSP script in the miniDSP, and here I am back to a favorite. With a sub woofer filling in from 30Hz to 170Hz, these sound fantastic - and reminds me why it is still one of my favorite setups.
This is what the room looks like again:
The sound is very clear with great imaging and lots of headroom for dynamic passages. 😀
Something to be said about a simple full range driver in a sealed IB cabinet.
For some reason, REM's song "Don't go back to Rockville... and waste another year..." keeps playing in my head. 🙂
xrk971
Thanks for providing so much information. I'm interested in the off axis performance of this driver. Could you please upload one of your REW measurement files? Very much appreciated.
Thanks for providing so much information. I'm interested in the off axis performance of this driver. Could you please upload one of your REW measurement files? Very much appreciated.
REW data files are pretty big as they contain the raw wav file of the sound. Not sure if it can be uploaded given 965k file size limit. Send me a PM and we can figure out another way.
Thank you X.
Looking at your measurements this driver seems to fall of rather sharp around 0 degrees but it might work for off-axis listening. There is a problem around 9kHz. Other than that off axis differences are pretty small for a wide-band driver. It would be great to have additional measurements from more angles to confirm.
Most other drivers I've seen so far work best around 0 degrees. After equalization of course. They all need EQ to achieve a halfway decent frequency response. Good thing EQ is readily available these days.
Looking at your measurements this driver seems to fall of rather sharp around 0 degrees but it might work for off-axis listening. There is a problem around 9kHz. Other than that off axis differences are pretty small for a wide-band driver. It would be great to have additional measurements from more angles to confirm.
Most other drivers I've seen so far work best around 0 degrees. After equalization of course. They all need EQ to achieve a halfway decent frequency response. Good thing EQ is readily available these days.
Yes, EQ out the 9kHz peak and it reduces ringing considerably. The off axis performance is quite nice from listening to it.
hi X - did you ever get a K-slot which you like as much or better than direct-radiator for this PRV? - (the price is close to a B&C 10 I'd like to try)
I have not put this behind a K yet. I have run some sims for a scaled down K15 but the problem is that fs is 175Hz and the Qts is such that you can't really get down to 100Hz. However, I haven't yet tried an XKi on it yet.