Meridian argent speakers.

  • Thread starter Thread starter Steenamaroo
  • Start date Start date
And I don't want to contradict you but that foam kept the drivers' frame from rattling (buzzing) against the cab which is being loose since if it were completely tight it couldn't rattle (buzz) ...... You possibly could have fixed it by simply tightening the beejesus out of it's screws, thus tightening it against the cab too much to allow it to rattle. But it couldn't rattle if there wasn't room for the frame edges to move so it was loose regardless of how tight you might have felt the screws were. Loose isn't just the screws being tight or not ...... it's anything that allows some part of the speaker frame to move.
But the better way is too use something like you did to both seperate the frame from the cab and sealing any leak that might occur due to lack of a gasket. Also, overtightening the screws could conceivably flex the frame enough to bend it though that's fairly unlikely.

In either case, it wasn't a bad voice coil plus doing what you did fixed the other possible problem that GCalo mentioned.

Not to be picky but too many people only read a smidgeon of a thread and don't get all the info.
While I know GCalo's only point was to help, he clearly only read the first post and didn't look thru the thread at all or he'd have seen that.
 
Fair enough, i guess it's just semantics.

Either way, guinness, smokes, and Mr. D.Bowie on some great speakers :)
I'm happy!
 
Steenamaroo said:
Thanks for the comments. I don't know if they are acoustic suspension, but i guess that could tie in. Perhaps the foam forms a seal?
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Yes the foam provides a seal but it has nothing to do with acoustic suspension ..... acoustic suspension is talking about the surrounds that are on the speakers themselves. On yours it would be that little curved piece of rubber or fabric (can't really tell in that pic) that is 'suspended' between the edges of the cone and the frame. It's the part that flexes when the cone moves in and out. The part you fixed is simply a gasket to seal the cab and cushion the frame so it doesn't rattle.
 
I'm showing my ignorance here, no doubt, but does acoustic suspension not rely on an airtight cabinet?
I really should google this.
 
Acoustic suspension speaker designs involve sealed cabinets. I see those Meridians have front vents so they're not acoustic suspension type speakers (unless they're chambered, I don't know what the internal cabinet design is like in those particular spakers but I digress...don't worry about it!)

It's quite normal for drivers and other components (such as a connector plate if there is one) to loosen up a little, cause some kind of sympathetic rattle and need to be tightened.
 
Lt. Bob said:
Yes the foam provides a seal but it has nothing to do with acoustic suspension ..... acoustic suspension is talking about the surrounds that are on the speakers themselves. ---
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Not correct. Acoustic suspension is the process by which drivers with very low Q's are supported within a cabinet environment by the air pressure within (sealed cabinet).

So if there is a leak in the cabinet you have lost the "suspension" that has been designed in to control the Q.
 
If I am understanding you correct, diggy_dude, I have had good results pulling out a pushed-in center piece ("bubble" to you?) with a vacuum cleaner. Usually, they pop back out before the vacuum cleaner nozzle has touched them.
 
That's called the dust cap. Gently sticking a piece of tape to the dent and pulling can get them out too, depending on how rigid the cap is. I would be very careful with the vacuum method and brace the driver so as not to risk over-excursion; ditto with the tape method.
 
That "center piece" is called a dust cap. It does just that-keeps dust out of the voice coil but it's also important for upper midrange and some high frequencies to the reproduction limit of the driver.

Vacuum cleaners do the job.
 
GCalo said:
Vacuum cleaners do the job.
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^^^^^ this ^^^^^^^ vacuum cleaners are the way to go.

Sometimes a very stiff dust cap might defy even a vacuum cleamer.
In those cases I have been know to take a needle and stick it in the dust cap to pull it out. Yes, it leaves a hole but it's very tiny.

But 99% of the time a vacuum cleaner will pull it out just fine for ya'.
 
It's a bubble! It looks like a bubble, so it's a bubble! :spank:
 
GCalo said:
Not correct. Acoustic suspension is the process by which drivers with very low Q's are supported within a cabinet environment by the air pressure within (sealed cabinet).

So if there is a leak in the cabinet you have lost the "suspension" that has been designed in to control the Q.
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yes that's right. I thought about what I posted as I was driving to my gig and realized that I'd spoken too quickly.
(why do things we post un a BBS stick in our mind while we're doing 'real' stuff? :D)
However .... the surrounds are still part of it or at least an indicator if that's the design.. Acoustic suspension speakers overwhelmingly have that large single-curve surround to allow a pretty good bit of cone excursion but yes ..... the thing actually suspending the cone is the air pressure in a sealed cabinet.
 
You're all wrong. The thing in the middle is a bandam-bladderstiddle.
 
Not to worry, Lt. Bob.

Everyone helps everyone here at least I need all the help I can get!!!

On very large drivers many dust caps are an open weave for venting. Since large drivers do not produce high frequencies, the dust cap is merely there to keep dust out, and since a good deal of heat is produced many assemblies are, therefore, vented.

Of course on some large drivers dust caps can be vey heavy (thick paper material) to add to the driver's mass.

Many times we would mix Elmer's glue with semi-gloss water based paint to paint the cones (paper cones) to increase mass and cone stiffness.

This made for a great looking driver as well.
 
GCalo said:
Not to worry, Lt. Bob.

Everyone helps everyone here at least I need all the help I can get!!!

On very large drivers many dust caps are an open weave for venting. Since large drivers do not produce high frequencies, the dust cap is merely there to keep dust out, and since a good deal of heat is produced many assemblies are, therefore, vented.

Of course on some large drivers dust caps can be vey heavy (thick paper material) to add to the driver's mass.

Many times we would mix Elmer's glue with semi-gloss water based paint to paint the cones (paper cones) to increase mass and cone stiffness.

This made for a great looking driver as well.
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I used to do a lotta reconing for a music store in the 70's and I'd experiment with all kinds of things like that.

In particular I regularly (on my own speakers) used parts that fit but were NOT the correct parts. One time I got a bunch of old alnico speakers from jukeboxes (all 15's) and put guitar type cones and coils in them.
They worked quite well.
 
Well the only prob there is that you can alter the Q of the driver and change it's impedance curve etc which affects the crossover and so on but the experimentation was fun.

Dead field today with all hand-held audio devices and lack of interest in box speakers.
 
GCalo said:
Well the only prob there is that you can alter the Q of the driver and change it's impedance curve etc which affects the crossover and so on but the experimentation was fun.

Dead field today with all hand-held audio devices and lack of interest in box speakers.
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well ...... I was using them for either bass guitar or PA bottoms so the Q was fairly unimportant.

Yeah ...... music reproduction in general is a dead field nowadays.



Even recording has gotten so rules-bound.
I see people freak if they need some kinda EQ on a mic or track. They are of the belief that everything should record perfectly without any experimentation or effort.
Hell, let's face it ..... the primary listening environment for the vast majority of listeners is a crappy pair of earbuds and 128kps MP3's.

Back when I was in college ..... EVERYone had a decent stereo and when a new brand of turntable came out, you'd see it popping up everywhere much like a new phone does today.
Anyone remember when BIC 'tables with the capacitance 'buttons' hit the scene? You started seeing them everywhere , I guess 'cause of the cool controls.

Those days are dead and gone ..... just like me in a few years.
 
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