[batmanslc2]

Just another very satisfied customer here.  I put them on my quad 12L active speakers and have enjoyed the results.  THey are NOT coming off and obviously $$ well spent.  Great PRoduct, Thanks Jim!

[JoeyGS]

Hi Jim,

I am from the Philippines and would like to know if you would ship your products here.  I own a pair of VR1s and would like to try your product.

Hope to hear from you soon.

Joey Severino
email:  josejbjj@econo.ideal-access.ph

[jimdgoulding]

Hi Jim,

I am from the Philippines and would like to know if you would ship your products here.  I own a pair of VR1s and would like to try your product.

Hope to hear from you soon.

Joey Severino
email:  josejbjj@econo.ideal-access.ph

Yes, Joey.  I ship everyhwere.  I will be contacting you shortly.

[jimdgoulding]

Interesting reading.  A guy was responding to a question posed in a forum in the UK as to which is worse, diffraction or room reflection and this is what he wrote:

"Driver and cabinet diffraction results in the propogation of delayed signal from virtual sources such as cabinet corners.

This tends to be very early signal errors in the time domain, where the superposition of these signals results in comb filtering and polar anomalies that result in both a smeared direct signal (Ld) - similar, but slightly less than the effects that non-aligned signals and non-coincident drivers create (and where active crossovers with signal delay can play a critical role).

The result is psychoacoustical loss of intelligibility and a modification of the speaker Q due to the modification of the polar response and frequency response (comb filtering).

Is this more critical than the greater delayed virtual sources created by 'larger' room reflections?  Simply put: No.

But we are debating similar problems that occur at differing orders of magnitude.

Diffraction effects as Jim is talking about effect the coherence of the direct signal just as the later arriving (generally) first order reflections interfere with the localization and intelligibility and are critical as they are responsible for image shift, and perceived tonal anomalies.

Ultimately, the room does have a greater net effect, but we are still limited by the source, and the total experience will be no better than the sum of the various contributory factors.

Thus it makes sense to address both the design of the speaker as well as the design of the room.

Both are legitimate factors. So they might best be viewed as similar issues, one at the base speaker level, and the other at a 'higher' order of speaker/room interaction".

Ozymandias
Senior member

Well said, mate.  I can add first hand that even with active crossovers and room treatment the removal of diffraction and its effects is beneficial.  And it's so cheap!

[Wind Chaser]

That last post is very interesting... surely anyone who swears by the effectiveness of room treatment will not want to stop there - with half a solution - by ignoring diffraction.  And like you said, it is so inexpensive.

[djbnh]

Jim et al,

Found a low cost fastening process for the felts that works well for my speakers. I note that my speakers each have two tweeters positioned in a plane one atop another, as follows:

[ O ]
[ O ]

From Jim I purchased 4 separate felts, sufficient for application to the total of 4 tweeters.

Anyway, I contacted EZPass and asked for more stickies that hold the transponder to the car windshield -  they sent me tons of pairs of the 3M Dual Lock strips with adhesive backing. Note that the Dual Locks are clear, if that matters for those looking to order the material.

You need to use two pieces of Dual Lock as a paired fastening device - one piece gets attached to the felt and the other to the speaker, as described below.

I used 3 pair of Dual Locks on each felt [feel free to use 4 pairs per felt, one for each corner], in the following pattern (XX--XX = fastener affixed with staple to the felt, parentheses (    ) = felt tweeter hole location) NOTE - not drawn to scale:

XX--XX                                                XX--XX

                    (                   )
                    (                   )
                    (                   )


                          XX--XX
 XX--XX                                                XX--XX

                    (                   )
                    (                   )
                    (                   )


                          XX--XX

I attached one piece of the 3M Dual Lock pairs to the felts by heavy staple "--" in the middle of the Dual Lock - I did not remove the adhesive on the Dual Lock piece that was attached to the felt side; the staple was sufficient to hold that fastener piece.[ By all means, feel free to use a staple and remove the wrapper covering the Dual Lock adhesive.] To the staple-attached Dual Lock piece, I attached the corresponding partner piece of Dual Lock (the partner pieces would be the ones that would be aligned / attached to the speakers.). After all the Dual Lock pieces were attached / paired, I removed the protective covering over the adhesive on the Dual Lock pieces that would be attached to the speakers, positioned each felt, and firmly pressed them into place around each tweeter. In this way, alignment of paired pieces was easy and quick, no fuss or muss.

It's been over 2 weeks now and the results are positive. No sagging, shifting, etc. of any felts. All pieces remain firmly attached. The Dual Lock pairs, IMO, work very well. I am not sure it they need to be stapled to the felts, but it worked easily and positively for my application. Thanks, EZPass!!!

Jim, the above application may be overkill, but I find the 3M Dual Locks, when used with a staple in the felt, to be a far stronger fastening devices than Velcro tabs, and highly preferred in my application.

YMMV.

[satfrat]

djbnh, on this 3M Dual Lock subject, would you say they hold the Woolies closer to the cabinet than velcro or is there basically the same spacing as the thickness of velcro? I have 6 velcro squares, 3 on top and 3 on the bottom holding my Woolies on my Lorelei's and they haven't moved for months now. IMHO, 2 velcro squares wasn't enough and the weight of the woolies would actually pull them from the velcro adhesive. With the 6 Velcro square configuration I have now, those Woolies are there to stay,,,,, unless I could find a better way to flush mount them to the cabinet. Thanks.


Cheers,
Robin

ps, I answered my own question. This 3M™ Dual Lock™ Low Profile Reclosable Fastener,Clear seems like just the thing that's needed to flush mount these Woolies of mine. I will be looking into this to see if I can do away with those thick Velcro squares. I would continue to use masking tape on the cabinets for protection from the adhesive but that staple idea sounds doable.

[djbnh]

djbnh, on this 3M Dual Lock subject, would you say they hold the Woolies closer to the cabinet than velcro or is there basically the same spacing as the thickness of velcro? I have 6 velcro squares, 3 on top and 3 on the bottom holding my Woolies on my Lorelei's and they haven't moved for months now. IMHO, 2 velcro squares wasn't enough and the weight of the woolies would actually pull them from the velcro adhesive. With the 6 Velcro square configuration I have now, those Woolies are there to stay,,,,, unless I could find a better way to flush mount them to the cabinet. Thanks.


Cheers,
Robin

ps, I answered my own question. This 3M™ Dual Lock™ Low Profile Reclosable Fastener,Clear seems like just the thing that's needed to flush mount these Woolies of mine. I will be looking into this to see if I can do away with those thick Velcro squares. I would continue to use masking tape on the cabinets for protection from the adhesive but that staple idea sounds doable.

Robin,

I feel the 3M Dual Lock fasteners I got for free from EZ Pass are a bit thicker than the Velcro Jim provides. However, this was not a problem in my application, as my tweeters extend out some from my speaker cabinet enclosures. If the Low Profile version that you've shown is a thinner product than my freebies, you may have hit upon an even better solution; please let me know how you get on, sourcing, cost, etc.

Peace,

David

[yammy1688]

Just received mine today.  Had to do a bit of cutting as the drivers are situated rather close vertically on my speakers so a bit on each wooly was snipped off to ensure no overlapping occurred. 

What I love about this tweak is that it's so easy to A/B.  Improvement was easily noticeable.  Pretty much the same characteristics others have been speaking of.  Awesome tweak, and awesomely fugly too

Would these have any effect around the woofers as well?  Perhaps there would be a market for ones more asthetically pleasing that use the factory pins for the grills?

[jimdgoulding]

Yammysama-  I regret that I don't know who you are by your moniker (kindly send me a PM) and that I somehow missed the boat on how tall to make your surrounds.  It's OK if they extend over the edge of the mounting basket of the nearest driver or drivers so long as they don't touch the compliant surround.  They probably don't look the prettier for your modification and if you would like I will replace them.  I will answer your question myself if you will refresh me on what type of speakers you have.  Thanks.

[Wind Chaser]

Jim,

How important is the shape and proximity of the cut (see picture below) and would there be an
appreciable difference in treating the mid band driver as well?

[yammy1688]

Here's what I'm referring to

Yammysama-  I regret that I don't know who you are by your moniker (kindly send me a PM) and that I somehow missed the boat on how tall to make your surrounds.  It's OK if they extend over the edge of the mounting basket of the nearest driver or drivers so long as they don't touch the compliant surround.  They probably don't look the prettier for your modification and if you would like I will replace them.  I will answer your question myself if you will refresh me on what type of speakers you have.  Thanks.

[satfrat]

I had mine made up with the hole slightly off center vertically so the bottom was level with the edge of the mid/woofer. It looks like that should have been done with yours.

Windchaser, did Jim make them woolies up for you with that cut out design? That does have a nice look to it, especially if you plan on dyeing them black.


Cheers,
Robin

[jimdgoulding]

Here's what I'm referring to

Yammysama-  I regret that I don't know who you are by your moniker (kindly send me a PM) and that I somehow missed the boat on how tall to make your surrounds.  It's OK if they extend over the edge of the mounting basket of the nearest driver or drivers so long as they don't touch the compliant surround.  They probably don't look the prettier for your modification and if you would like I will replace them.  I will answer your question myself if you will refresh me on what type of speakers you have.  Thanks.

Oh Yammy, I insist that you let me replace that.  Don't know how I managed to screw that up.  I will PM you shortly to discuss and for a couple of measurements so that the cutout can be centered around your tweet and the bottom of the pad doesn't encroach on your mid/bass basket.

[Wind Chaser]

Windchaser, did Jim make them woolies up for you with that cut out design? That does have a nice look to it, especially if you plan on dyeing them black.

No, those are someone else's speakers.  Mine are pictured below.  Jim made me some rough cut butt ugly test samples; which I will pass along to a doctor who is cued up to buy the same speakers after hearing mine.

The middle driver crosses over at 1.8K and because it overlaps the ribbon, I'm thinking maybe one big wooly to cover the perimeter of both drivers?  But because the middle driver works in free air, I might have to address the back end as well...

[jimdgoulding]

Wind-  I don't think so much because your tweet is being crossed over lower than average where it is producing a ton of your midrange detail.  That, and because unlike the Spica's (which you show above), your cabinet is much narrower.  But, DO give me your impressions before you pass those butt pretty examples on.  I'm still on the fence about ribbons.  Particularly those imbedded in a cavity.  Cheers.

[satfrat]

Jim made me some rough cut butt ugly test samples; which I will pass along to a doctor who is cued up to buy the same speakers after hearing mine.

The doctor wouldn't happen to be a plastic surgeon would he/she? Could be a win/win situation if he/she specializes in butt ugly.  


Cheers,
Robin

[jimdgoulding]

My man. You crazy.

[Wind Chaser]

There's no accounting for anything as subjective as beauty.  Perhaps my opinion will change once I install them and hear what they do...   

[efhjr]

OK, I am intrigued. I've got a pair of 1977 Klipsch Cornwalls (horizontal tweeters). Are the surrounds a no-brainer?