Hi all! I just built some 3" ported full range speakers from faital 3fe25's but they are incredibly bright. I hace seen the frequency graph but didn't expect them to be quite so trebly!
I'm a bit confused about how to go about fixing this. I know I need a resistor and a capacitor across the + and - but not sure what values. The driver is 4ohm. I was thinking maybe I should order a few different types of capacitor and swap them out and see what happens. Ideally I think I want to take the 10k area down. What range of caps should I try and what resistor is needed?
Tia.
I'm a bit confused about how to go about fixing this. I know I need a resistor and a capacitor across the + and - but not sure what values. The driver is 4ohm. I was thinking maybe I should order a few different types of capacitor and swap them out and see what happens. Ideally I think I want to take the 10k area down. What range of caps should I try and what resistor is needed?
Tia.
The datasheet of the Faital Pro 3FE25 indeed shows a huge (10 dB) increase at the top end. To reduce only the top end you might want to try putting an inductor in series with the driver to low pass it. 'Bypass' the inductor with a resistor in parallel to reduce it's effect if necessary. The inductor value sets the frequency at which it starts rolling off the highs.
Or alternatively, create a notch filter at say 12 kHz by putting a inductor, capacitor and resistor in parallel and putting the whole in series with the driver. the notch frequency is set by the inductor and capacitor, the amount of cut by the resistor. Download Boxsim, simulate a box with a Visaton FRS8M and experiment with different values to see what frequencies are affected with certain component values.
Example values to start with: 0,33 mH or 0,33 mH / 0,47 µF / 33 ohm.
Or alternatively, create a notch filter at say 12 kHz by putting a inductor, capacitor and resistor in parallel and putting the whole in series with the driver. the notch frequency is set by the inductor and capacitor, the amount of cut by the resistor. Download Boxsim, simulate a box with a Visaton FRS8M and experiment with different values to see what frequencies are affected with certain component values.
Example values to start with: 0,33 mH or 0,33 mH / 0,47 µF / 33 ohm.
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Ah ha! Thanks! So could I use a pot to vary the resistor value that would set the roll off?
What value resistor range would be useful in this respect? Very eager to try your suggestion!
What value resistor range would be useful in this respect? Very eager to try your suggestion!
The datasheet of the Faital Pro 3FE25 indeed shows a huge (10 dB) increase at the top end. To reduce only the top end you might want to try putting an inductor in series with the driver to low pass it. 'Bypass' the inductor with a resistor in parallel to reduce it's effect if necessary. The inductor value sets the frequency at which it starts rolling off the highs.
Or alternatively, create a notch filter at say 12 kHz by putting a inductor, capacitor and resistor in parallel and putting the whole in series with the driver. the notch frequency is set by the inductor and capacitor, the amount of cut by the resistor. Download Boxsim, simulate a box with a Visaton FRS8M and experiment with different values to see what frequencies are affected with certain component values.
Example values to start with: 0,33 mH or 0,33 mH / 0,47 µF / 33 ohm.
All in good time!
Take the guess out, and download XSim.
Get a mic, measure your speaker as is, import that into XSim and figure out the best values for your BSC.
Then, you'll ne happy and have great sound.
That's sounds like surgery! Is it destructive?
You might need baffle step correction.
Chris
You need BSC - try 1mH and 8ohms. Adjust R to taste.
Doesn't have to be fancy air core. These work fine as power is low. A 3W to 5w metal film power resistor is fine.
Look what I found on AliExpress
Special offer I inductors Power Inductors 1MH 8*10MM environmental protection-in Inductors from Home Improvement on Aliexpress.com | Alibaba Group
Doesn't have to be fancy air core. These work fine as power is low. A 3W to 5w metal film power resistor is fine.
Look what I found on AliExpress
Special offer I inductors Power Inductors 1MH 8*10MM environmental protection-in Inductors from Home Improvement on Aliexpress.com | Alibaba Group
That's sounds like surgery! Is it destructive?
Yes,
take appropriate precautions.
Always wear safety glasses, and fireproof mittens when handling a baffle step correction.
Or you could just read about them...
You dont mention what treatments you did inside the enclosure to minimize the treble acoustical energy, I suppose you did not do anything as usual in these cases, DIYers want resolve an acoustical problem by electronic means as Zobel, filters, capacitors etcHi all! I just built some 3" ported full range speakers from faital 3fe25's but they are incredibly bright. I hace seen the frequency graph but didn't expect them to be quite so trebly!
I'm a bit confused about how to go about fixing this. I know I need a resistor and a capacitor across the + and - but not sure what values. The driver is 4ohm. I was thinking maybe I should order a few different types of capacitor and swap them out and see what happens. Ideally I think I want to take the 10k area down. What range of caps should I try and what resistor is needed?
Tia.
See This thread:
How to Treat Passively Peaky FullRange Drivers
OR THIS:
How Treat Passively Peaky Fullrange Drivers
Due FS 110Hz you will need up the bass response w/the 10mm browm car hood blanket.
Small enclosures will favor mid and hi frequencies and down the bass.
Hope this Help.
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I have used this driver extensively (3FE25), it is smooth and really pretty much free of annoying peaks. "Too bright" usually means an imbalance of bass relative to treble - usually cured with a shelving filter like a bsc. A "peak" at a certain frequency will not be described as "bright" because it only affects certain sounds and passages that have content at that frequency.
You won't find too many drivers smoother than this except for maybe TC9FD/TG9FD/10F but they are all 86-87dB sensitve and not 90dB.
The breakup peak at 12k is angle dependent and smooths out as soon as you are off axis so is not a problem in general.
You won't find too many drivers smoother than this except for maybe TC9FD/TG9FD/10F but they are all 86-87dB sensitve and not 90dB.
The breakup peak at 12k is angle dependent and smooths out as soon as you are off axis so is not a problem in general.
I put a 4" x 3" x 2" slab of rockwool behind the driver. The cabinet is tuned to around 85hz with a 32mm wide port.
You dont mention what treatments you did inside the enclosure to minimize the treble acoustical energy, I suppose you did not do anything as usual in these cases, DIYers want resolve an acoustical problem by electronic means as Zobel, filters, capacitors etc
See This thread:
How to Treat Passively Peaky FullRange Drivers
OR THIS:
How Treat Passively Peaky Fullrange Drivers
Due FS 110Hz you will need up the bass response w/the 10mm browm car hood blanket.
Small enclosures will favor mid and hi frequencies and down the bass.
Hope this Help.
Ah ha! Thanks!
BSC is just an inductor and resistor in parallel between amp and driver +ve terminal. No surgery involved
Thanks, I will have a look! Are there any other types of inductors I would be able to source locally?
You need BSC - try 1mH and 8ohms. Adjust R to taste.
Doesn't have to be fancy air core. These work fine as power is low. A 3W to 5w metal film power resistor is fine.
Look what I found on AliExpress
Special offer I inductors Power Inductors 1MH 8*10MM environmental protection-in Inductors from Home Improvement on Aliexpress.com | Alibaba Group
I'm thinking these might do the trick?
http://uk.farnell.com/te-connectivi...QYASABEgKPYfD_BwE&CAWELAID=120173390000004198
MCSCH895-102KU MULTICOMP, Inductor, MCSCH895 Series, 1 mH, 300 mA, 1.8 ohm, +- 10% | Farnell UK
http://uk.farnell.com/te-connectivi...QYASABEgKPYfD_BwE&CAWELAID=120173390000004198
MCSCH895-102KU MULTICOMP, Inductor, MCSCH895 Series, 1 mH, 300 mA, 1.8 ohm, +- 10% | Farnell UK
You need BSC - try 1mH and 8ohms. Adjust R to taste.
Doesn't have to be fancy air core. These work fine as power is low. A 3W to 5w metal film power resistor is fine.
Look what I found on AliExpress
Special offer I inductors Power Inductors 1MH 8*10MM environmental protection-in Inductors from Home Improvement on Aliexpress.com | Alibaba Group
hey i had the same problem with mine even they are a bit different , they are 3 fe 22 the annoying distorsion at heights still occur.
i placed a 1 mH coil in series , then in paralel with the coil a 2 uF capacitor and 22 ohm resistor . it sounds ok for my setup.
But remember **** in **** out , when I play u tube at low fidelity they scream annoyingly again!
i placed a 1 mH coil in series , then in paralel with the coil a 2 uF capacitor and 22 ohm resistor . it sounds ok for my setup.
But remember **** in **** out , when I play u tube at low fidelity they scream annoyingly again!
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