Well all I can say is the Silver flutes has pasted the test of time for me with my dads speaker's. I just bought a pair of the 8 inch Silver Flutes (W20RC38-8) woofers a few months back. I really don't care if there is better bands out there but, the Silver Flutes are my favorite hand's down. Mr. Daniel
DCR online calculator, by Jurgen Micka...
Loudspeaker enclosure calculating with Thiele Small parameter
Later,
Wolf
Loudspeaker enclosure calculating with Thiele Small parameter
Later,
Wolf
I have the same model as you.
Would the woofers I have be more likely to be closer to your specs or manufactured specs?
If someone needs boxes, I have 2 I made (oversized) for 6.5" silver flute.
Can't say they are ideal sealed (much bigger).
OD 8" x 12" x 19" (close to 1:1.618 golden ratios).
.8ft3 sealed
Rounded corners and black (slightly textured) duraliner, looks pretty nice actually.
Darker than what the flash made them look.
Even rounded inside for more air flow around woofer.
Recessed binding posts, void free 1/2" ply.
OD 8" x 12" x 19" (close to 1:1.618 golden ratios).
If someone wants/needs them, I'll sell them.
I had a local car audio place build them.
I apologize if this is not the right place to post.
Send email here.
Norman
Can't say they are ideal sealed (much bigger).
OD 8" x 12" x 19" (close to 1:1.618 golden ratios).
.8ft3 sealed
Rounded corners and black (slightly textured) duraliner, looks pretty nice actually.
Darker than what the flash made them look.
Even rounded inside for more air flow around woofer.
Recessed binding posts, void free 1/2" ply.
OD 8" x 12" x 19" (close to 1:1.618 golden ratios).
If someone wants/needs them, I'll sell them.
I had a local car audio place build them.
I apologize if this is not the right place to post.
Send email here.
Norman
Why not build a "regular" ported box (I forget which order it is or whatever) and use EQ on the low end?
I plan to do that. Not just asking to be irritating 😀
Sure you can. I actually did a BR with a 13L box.
If you intend to EQ for the lows, just be careful with the cone excursion.
If you intend to EQ for the lows, just be careful with the cone excursion.
Adding eq to boost below port tuning can easily blow a woofer, not recomended. Flipside as to why is that below this frequency the woofer is no longer loaded by the port and out of phase. This results in no net gain in output but greatly increased excursion that can exceed Xmech.
Are these silver flute drivers suppose to make a buzzing noise when being broken in?
I have 8 and tested 4 and they all do this I think?
Does this go away? Is this normal?
I guess they are moving around 2-3 mm one-way, otherwise they don't make the noise unless you put your ear to the hole in the magnet shield, then you can hear a little buzzing all the time.
I have 8 and tested 4 and they all do this I think?
Does this go away? Is this normal?
I guess they are moving around 2-3 mm one-way, otherwise they don't make the noise unless you put your ear to the hole in the magnet shield, then you can hear a little buzzing all the time.
Hello there. I have never heard the 6 1\2 inch silver flutes my dad has had for 10 years ever buzz or make noise. I would call the place you bought them from and ask them and go from there. Also I broke the silver flutes in gentle and slow never pushing the drivers to x max hard. I hope you figure it out they are the best kept secret in budget Hifi. Mr. Daniel
Jimmy - don't let your friends seeing you doing that 😱
The 6.5" 8 ohm seems the best of the lot. They are a little noisy right out of the box when sweeping with generator. However in a properly tuned box with felt/cork/damping fill they take on a whole new silky smooth sound.
Highly recommend removing dust cap adding a wood phase plug.
I'd keep checking your signal though, the buzzing may be something else.
The 6.5" 8 ohm seems the best of the lot. They are a little noisy right out of the box when sweeping with generator. However in a properly tuned box with felt/cork/damping fill they take on a whole new silky smooth sound.
Highly recommend removing dust cap adding a wood phase plug.
I'd keep checking your signal though, the buzzing may be something else.
I highly recommend leaving the dustcap alone. If the neck, former and/or pole have adequate venting, the driver will be fine.
To quiet some chatter from the backside of the magnet, I'd stuff some rope caulk between the magnet and frame.
I see full range driver fans doing this.
I see full range driver fans doing this.
When deciding on a driver the first thing I do is play some bass through it and see how quiet it is.
So far the Silver flutes are the loudest I've tested (possibly without being bad/broken, I don't know).
I played a WF152 (93 cm^2 cone area) Wavecor next to it at the same power input and it was dead quiet compared to the Silver Flutes (well the 4 that I tested). And it was moving more than the Silver Flute of course.
I did the caulk rope one time. I don't think it does much if anything.
So far the Silver flutes are the loudest I've tested (possibly without being bad/broken, I don't know).
I played a WF152 (93 cm^2 cone area) Wavecor next to it at the same power input and it was dead quiet compared to the Silver Flutes (well the 4 that I tested). And it was moving more than the Silver Flute of course.
I did the caulk rope one time. I don't think it does much if anything.
It's definitely chuffing 😀
If you plug the back hole in the shielding it gets worse.
Is the hole in the shielding big enough?
Is it a good idea to make it bigger or take the back of the shielding off?
I think I can cut it off with a cutting wheel, but I'm not quiet sure how far back the shielding goes.
Why do I always get shielded drivers (other than being sheep)?
Are the drivers left over from the CRT TV era?
Who needs them now-a-days?
If you plug the back hole in the shielding it gets worse.
Is the hole in the shielding big enough?
Is it a good idea to make it bigger or take the back of the shielding off?
I think I can cut it off with a cutting wheel, but I'm not quiet sure how far back the shielding goes.
Why do I always get shielded drivers (other than being sheep)?
Are the drivers left over from the CRT TV era?
Who needs them now-a-days?
I would avoid the shielded version I guess.
There is quiet a bit chuffing at excursion.
It might the shielding hole, but I'm a little doubtful.
I think I could do an experiment to see by rolling up a piece of paper and putting it in the magnet hole (how did I forget what that was called 
pole piece maybe?).
I would generally avoid this driver if you listen at high excursion though. At least the Silver Flutes I have.
If it is not quieter with the paper in the "pole piece" I could cut the shielding off with a cutting wheel but it would look bad and take time and heat up the magnet if I didn't stop every few seconds and squirt the magnet with water or wait really long time.
I think sometimes people forget that other people use drivers differently and a test is suppose to be an accurate simulation of reality, but it is never reality. And to do test effectively first you have to know the use, whether it be general or better yet as specific as possible.
Seems like once "science" gets involved people are like: "oh yeah that guy has the science gods on his side", I'm gonna copy him.
I do it too with amps because I don't know better, but with speakers I kind of know what I like.
The clean low end of Peerless is what I like, at least in a two-way with no high-pass where you have to suck out as much bass as possible. These Silver Flutes are good for listening to classical music, maybe jazz on a record player and a tube amp perhaps or maybe if you use a high-pass filter.
Do I sound too much like "comic book guy"? lol
There is quiet a bit chuffing at excursion.
It might the shielding hole, but I'm a little doubtful.
I think I could do an experiment to see by rolling up a piece of paper and putting it in the magnet hole (how did I forget what that was called pole piece maybe?).I would generally avoid this driver if you listen at high excursion though. At least the Silver Flutes I have.
If it is not quieter with the paper in the "pole piece" I could cut the shielding off with a cutting wheel but it would look bad and take time and heat up the magnet if I didn't stop every few seconds and squirt the magnet with water or wait really long time.
I think sometimes people forget that other people use drivers differently and a test is suppose to be an accurate simulation of reality, but it is never reality. And to do test effectively first you have to know the use, whether it be general or better yet as specific as possible.
Seems like once "science" gets involved people are like: "oh yeah that guy has the science gods on his side", I'm gonna copy him.
I do it too with amps because I don't know better, but with speakers I kind of know what I like.
The clean low end of Peerless is what I like, at least in a two-way with no high-pass where you have to suck out as much bass as possible. These Silver Flutes are good for listening to classical music, maybe jazz on a record player and a tube amp perhaps or maybe if you use a high-pass filter.
Do I sound too much like "comic book guy"? lol
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If anyone is using the shielded version, there is quite a bit less chuffing (noise arising from air turbulence) if you remove or bypass the shielding in the back.
But even with the shielding kind of bypassed with a rolled up piece of paper in the center the chuffing is still there, just less.
For example I have a Wavecor (95 cm^2 cone area) woofer and it makes no noise at the same power input as the Silver Flute. It probably moves 30% more.
Good woofer for the money though, big VC, big magnet, high BL.
Reminds me of a pro woofer a little due to these factors.
That's probably why people like it, particularly the midrange.
Cutting the center out and putting in a phase plug (as some one suggested) might actually keep this woofer from chuffing.
But even with the shielding kind of bypassed with a rolled up piece of paper in the center the chuffing is still there, just less.
For example I have a Wavecor (95 cm^2 cone area) woofer and it makes no noise at the same power input as the Silver Flute. It probably moves 30% more.
Good woofer for the money though, big VC, big magnet, high BL.
Reminds me of a pro woofer a little due to these factors.
That's probably why people like it, particularly the midrange.
Cutting the center out and putting in a phase plug (as some one suggested) might actually keep this woofer from chuffing.
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