Early on when the original 6.5" first came out Lars mentioned the range would eventually go to 12".Is it on the purifi roadmap?
Purifi drivers have significantly lower IMD and THD compared to the vast majority of drivers, and (without looking it up) I would say that for the vast majority of speakers, even really good ones, the measured distortion isn't actually below theoretical thresholds of audibility.can you not obtain the same level of AUDIBLE performance for much less money?
Looks like a very promising build, but matching drivers with a >20dB difference in sensitivity must be interesting!Maybe, which did you have in mind? Satori 9.5 texteme? Which is more like a 9" but most importantly you don't have the linearity (radiation area deviation) of these or the ability to play as low and it doesn't have as good distortion characteristics or can play as loud.
The other would be 18sound 10Ntl3500 with tetracoil, it won't play as low. Great driver just in my application I want the option to crossover to a sub from 50hz to 100hz. And if i did go that way i would go with the 12" version, maybe 2 of them. Having had both and the 12 version i find (im guessing here, maybe another reason) because distortion being so low on the purifi i've never had vocals so clean.
Yes it is expensive compared to another driver the question is, is it better value to me and the answer it absolutely by a decent margin. Is it audible yes. Have i tried other drivers, Yes.
Is it cheaper then buying something off the shelf with the same quality yes over 10-30 fold.
With the dynamic range and polars going to around 900hz-1khz I am able to make an excellent 2 way with a single crossover. I dont need a giant horn where after 8khz the treble becomes diluted and now i need a super tweeter to compensate. I dont need a 4" compression driver to get it to crossover lower which will have breakup just after 10khz. Instead I'm good all the way to around 17khz.
here is a review of the compression driver i am using.
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18Sound ND1480BE Beryllium 1.40" Compression Driver Test & Review
In this blog post I test the 18Sound ND1480BE Beryllium compression driver. This driver retails for €1,350.00 each ($1,485 USD). Features 3 inch premium Beryllium dome polymer surround diaphragm Extended HF with minimal breakup 112 dB 1W / 1m average sensitivity 1.4 inch throat exit 3 inch...josephcrowe.com
here is the review of the purifi ptt10
Purifi PTT10.0X04-NAB-02 10" Aluminum cone woofer | HiFiCompass
1. What and why am I testing? 2. What did the manufacturer state? 3. Visual inspection 4. Impedance frequency response 5. On-axis frequency response (at 315 mm) 6. Off-axis frequency responses (at 315 mm) 7. Harmonic distortion (at 315 mm) 8. Harmonic distortion (at 20 mm) 9. Voice coil current...hificompass.com
Easy when active crossover.Looks like a very promising build, but matching drivers with a >20dB difference in sensitivity must be interesting!![]()
Not according to results at Klippel, at least with real music. MOST people are closer to picking up between -15dB and -20dB, but a small number of people can detect -40dB. Even those detecting -30dB is quite low.... -40dB isn't smack-you-in-the-face obvious, but it's audible, and I think most people could pick it up in fast switching.
This isn't actually harmonic distortion (I think?) and it's not fast switching, but point taken.Not according to results at Klippel, at least with real music. MOST people are closer to picking up between -15dB and -20dB, but a small number of people can detect -40dB. Even those detecting -30dB is quite low.
Listening Test
www.klippel.de
View attachment 423636
This isn't actually harmonic distortion (I think?) and it's not fast switching, but point taken.
On the other hand, we have to consider that some people probably took this test with a percent or two THD on top of what's in the test, I wonder if that matters?
I use the 18sound 12NTLW3500 tetracoil - mighty fine drivers with a tight kick to it, but just not that fine detail that the Purifi's have.The other would be 18sound 10Ntl3500 with tetracoil, it won't play as low. Great driver just in my application I want the option to crossover to a sub from 50hz to 100hz. And if i did go that way i would go with the 12" version, maybe 2 of them. Having had both and the 12 version i find (im guessing here, maybe another reason) because distortion being so low on the purifi i've never had vocals so clean.