Fountek’s FR88EX full range driver features an attractive thin-foil aluminum cone, robust cast-aluminum frame, and an optimized high-strength neodymium motor. Fountek FR88EX 3″ Full Range Imp – 8 ohm Fs – 95Hz Qts Vas – L SPL – db Price break in quantity – call FR88 EX Data Sheet. I recently purchased Fountek FR58EX and FR88EX full-range drivers. The packaging box of each model contains a pair. ‘Matched pair’ is.
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Danny Richie Facilitator Posts: I got them from Madisound. Here is the frequency response measured in Jeff’s box. It’s not bad actually. There is an expected baffle step loss below 1kHz.
That is typical for any driver used in a small box. Here is the effect of Jeff’s grill. Great job on the grill. This thin design has a very ffr88ex effect on the response.
The off axis response looks pretty typical of a small driver too. The impedance looks good and fountke free of any box resonances. Tuning frequency is just over 65Hz. And here are the two speakers. There is a little variance between the two in founte, lower range, but it’s not too bad.
This is where the rubber meets fr88sx road though. If there was just one measurement that you can do that will tell you more about how a speaker will sound it’s the cumulative spectral decay. It will show you stored energy or ringing issues over time. Stored energy or cone break up is very easy to hear.
It will add a little residual ring to everything. And this little driver clearly has some issues in that department. Here is a csd response. There is actually a peak in the response above 20kHz that shows up in the csd. The top of this peak is where the computer sets the 0 on the scale.
So everything is artificially pushed down on the scale. Let me bring the whole scale up 5db and you will see that there is significant break up in the 1kHz to ffountek range. It is taking a long time to go away. This is actually typical metal cone issues.
For some reason a lot of people have been lead to believe that these stiffer cones will have lower distortion. As that lower distortion will equate to cleaner sound. It’s really hard to hear those differences because fg88ex are at such a low level.
Cone break up adds a ringing as stored energy that continues to fountwk long after the original note has ended. This is easy to hear. So I added a small inductor and Mills resistor to this as a baffle step loss compensation filter.
This will help the sound a lot. See the before and after curves. This keeps 1kHz range and above from being pushed forward in the sound stage. So imaging is improved And check out the csd. If you flip back and forth from the first csd posted then you will see that the range from 1kHz and down is up now.
But if you really consider what is going on then you can understand that with the output of the 1kHz range and down being equal, then the break up from 1khz and up has been reduced by 5db. A 5db reduction in output means it didn’t play near as loud and wasn’t as excited.
So it induces less ringing. It is like looking at the second csd response that I posted that looked really scary and having that graph from 1kHz and down, but having the results of the first one from 1kHz and up.
In short, at the same output level the ringing will be less sever. Compare that with the csd of the LGK’s that I posted in this thread: Redefy Audio Industry Participant Posts: Danny, Thank you for taking the time to measure my speakers and for the very detailed explanation of the results. I learn a lot every time you post something like this. A couple of questions: Is the variance in the funtek speakers just the results of a difference in the driver characteristics or something with my box?
Based on the off axis measurements, I should have the speakers turned to face me, correct?
What is the angle for the different measurements on the off axis measurement? Sorry if it is in the graph. I am ft88ex trying to get my head around the waterfall graphs. Not something I have really understood in the past. I will take some time and study them.
Fountek FR88EX – € : , Loudspeaker shop
I can’t wait to fd88ex the baffle step fuontek compensation filter to hear fr88ec difference it makes. Then, I will compare them to the LGK’s. I have my LGK flat pack from Ben and I am ready to start building fountwk soon as you have the drivers fountfk.
Hank Full Member Posts: Jeff, Danny is saying that the shorter the decay time, the better. IOW, the shorter the traces on the Z axis that appear to come off the page are, the better.
I hope that helps a bit. I am just about to build a pair to this design. Would you care to share what values you used for the baffle filter?
You mention a small inductor and resistor but it would be founteek to know the values as the result looks like they worked well.
Sorry you list me there. I asked about the component values used in the baffle filter. I do not understand your answer, please provide some more context. What I don’t do is put forth time and effort into my design work then give the information away for free so everyone can buy their parts elsewhere. I for one appreciate it very much. Concerning other full range speakers, are you accepting orders for your new full range driver yet?