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Old 12th February 2013, 06:06 PM   #3451
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Quote:
Originally Posted by stevodude View Post
When the magnets are butted up to the brace, should I drill a small hole (it is propably about a 12mm drill bit) where the magnet hole is, or leave it solid.
I didn't answer this specifically because it doesn't matter one way or the other.
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Old 13th February 2013, 11:23 AM   #3452
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Quote:
Originally Posted by Saturnus View Post
I didn't answer this specifically because it doesn't matter one way or the other.
Thumbsup, cheers for that.

I have next week off, as the wife is away, so it's children And boominator week yah.

Sent from my XT925 using Tapatalk 2
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Old 13th February 2013, 07:40 PM   #3453
ekbaird is offline ekbaird  United States
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Default ONE MORE QUESTION

Thank for this forum everyone been learning a lot. So I am ordering GW-1058s because HP-10Ws are nowhere to be found in the US.

AMP6 on the way.

But Tweeters..
According to Saturnus, its much better to have an original KSM1001A than a replica. One of the suppliers of the original he recommended was adelcom ( CTS / Motorola KSN-1001 Recessed Mount Piezo Electric Super Horn Tweeter</font> ) I emailed them after having trouble ordering and recieved a reply saying they were hacked and doing orders manually, but also their stock of that model was new unlabeled tweeters from the factory that bought CTS's rights to produce.. This is on their website:

"As everyone knows, CTS ceased manufacturing their piezo electric tweeters a number of years ago. There were rumors that another firm had purchased the molds and the rights to produce the same high quality products that their predecessors (Motorola & CTS) had provided the industry. We are pleased to report that the rumors have proved true and we have located the prime manufacturer in the United States. Their product is currently being manufactured in the Philippines and distributed throughout the United States. Many of the molds had to be re-tooled, so the prices have risen to meet their financial challenges of current production. We are purchasing their products as each model becomes available. The same high quality sound is their goal! We are shipping the balance of our Motorola and CTS tweeters first until the old inventory has been depleted. If you prefer only the newer inventory, just inform us at the time of your order and we will let you know if that item is in current production. Unfortunately the new owners are still trying to decide on a name. Therefore the latest available product does NOT yet have a new name on it. These are the same Piezos that use the same original Motorola / CTS Piezo elements that make a piezo a piezo. Don't be fooled by the cheap imported copies that don't hold up."

Seems legit??...
I just want to know if anyone has ordered from these guys and if they can even tell if they are original or not. I mean they could be selling replicas as original for all I know for 3-4 times the price. Saturnus suggested the Goldwood replicas from Parts Express were the equivalent of the decent sounding Monacor replicas. But I want to get the original piezos because I want the top end to be as tight as possible and if there is such a big sonical difference I wont compromise. Plus I couldnt find the best possible woofers so I might as well go big on the rest of the system.

These guys also claim "original" horns Piezo Source - KSN1001A/1005A

I want originals in the US! What do you guys think?
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Old 13th February 2013, 08:08 PM   #3454
ekbaird is offline ekbaird  United States
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Default never mind all that..... ^

From their facebook lol
It was on the boominator wiki too....
theyre located 3 towns away from me....
so the sketch website dude in florida is buying piezo source's products... got it....



"Company Overview
Piezo Source, Inc. has been manufacturing and supplying the highest quality piezoelectric speakers since acquiring the exclusive rights, designs, and manufacturing line from Motorola/CTS in 2005. The speakers manufactured by Piezo Source maintain the high quality originally ensured by Motorola and later by CTS.
The quality of our bimorph ceramics means that our speakers are also used as a transceiver - speaker and microphone.
Description
The core products sold by Piezo Source are the original piezoelectric speakers and receivers designed, patented, and manufactured by Motorola/CTS for over 30 years. In addition to offering many of the original Motorola/CTS products, Piezo Source has developed new designs and materials to support the needs of new and existing customers and their developing applications."
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Old 19th February 2013, 09:30 PM   #3455
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Hi.
Today i notised a bad sound from one of my drivers. Turned off and pushed on the one that sound bad. Could anyone tell me what this is? http://sdrv.ms/WNiJwH
Best regards fro Bjoern
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Old 19th February 2013, 10:20 PM   #3456
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That's a defect driver. Unsure of the cause but likely candidates are: it got kicked (unlikely), it got physically touched while playing (likely), the VC warped due to too much power (unlikely), or driver had defective glue used on the VC from the factory (very likely). It could also be the magnet that shifted due to a dropped. It sometimes happen to neo drivers for no good reason as well as neodynium expands more the ceramic magnets and forces it loose when it cools again so it shifts position.

Try posting over at speakerplans.com. There are some people over there that repairs speaker drivers for a living, they'll tell you what to do. It most likely have to be reconed and checked for a slipped magnet which will mean you have to take the whole thing apart again.

If after checking it turns out it's a factory defect which I consider likely you get it replaced but you still have to take it out which is a pain in the rear.
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Old 20th February 2013, 09:27 PM   #3457
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Thumbs up my build starts here

Hi All,

I'm pretty new to all this, I made a poor start by exploring options other than using HP10W's but Saturnus put me right and I bow to this excellent design and will be keeping my Boominator as close to the mark II design as possible..... I may have some questions regarding amplification as I will not need my Boominator to run for days on end. If I can get 24hrs out of it at full volume, I will be more than happy. Still, I fully intend to incorporate solar but may want to go down the louder, 24v route at the expense of time between charges... anyway, I'm not thinking quite that far ahead yet.... I just want to get the speaker box built and worry about the electronics later.....

So, I have my box panels all cut and ready, I shall spend the next month or so cutting holes, routing and rounding edges and getting everything ready for assembly. I have ordered the HP10W's from Intertechnik.de and some speaker grills from ebay. Can't wait to start assembly.

I guess I have to order tweeters from USA but that may have to be a couple of pay packets down the line, it'll take me a while to recover from the phenolic ply and the HP10's

I'll try and post up photos as I go along......

Anyway, my final aim is for a boombox that is loud, has high quality sound (I am an audiophile) and will be great for picnics and parties on Whitstable Beach

So here's to another UK Boominator build, wish me luck

BJ
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Old 21st February 2013, 05:30 AM   #3458
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Thats great BJ, I think the Original Boominator (or the MK II) would be the best to build. Looking forward to seeing some build shots.

I've pretty much have the enclosures complete, and I am tidying up the electronics.

I have spent quite some time and a fair amount of single malt deliberating over how I was going to get access/mount the Audio/usb switches over the last few days, and the original design called for a recess in the top for all this, or a rectangle cut out of the centre.

I wanted to keep the 'routed circles' look of the front, so I am splitting the functions between the front and back and putting a 'third eye' in the middle. :-)

So, I now have a new routed hole in the center, and is a duplicate size of the vent holes.

Attached is also a mudmap of my electrical layout which I think should work. The only thing left to purchase is the 12v Sla smart charger, no hurry as I can fit it after.

Click the image to open in full size.

Click the image to open in full size.
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Old 21st February 2013, 08:39 AM   #3459
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Great stevodude.... I like the circular panels.... I do worry a little that once the box is all sealed that access to the electronics compartment is limited, I want to be able to replace Amps, etc if they go wrong.... Like many other builders, you have mounted your tweeters in the upper corners which is a deviation from the original design..... Somehow, it looks right but Saturnus knows his stuff and I wonder why he didn't mount his there...

BJ
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Old 21st February 2013, 10:35 AM   #3460
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Quote:
Originally Posted by brummiejon View Post
Somehow, it looks right but Saturnus knows his stuff and I wonder why he didn't mount his there...
Limiting diffraction effects. When a speaker is mounted with equal distance to each cabinet boundary you get a peak at a certain frequency determined by the distance from the acoustic center to the cabinet sides. You also get a decreasingly significant dip at all even harmonics of the center frequency, and a decreasingly significant peak at all odd harmonics.

The diffraction is used actively in the Boominator to compensate for the dip in the HP10W frequency response at around 600hz. Note that the GW1058 has a narrower and deeper dip at the same frequency which cannot be fully compensated just by diffraction alone.

At frequencies the tweeter is operating at the diffraction from being placed on the middle of the baffle has almost no effect. However, the distance to the side does and placed as drawn it will create a dip at the 5Khz peak frequency of the piezo. Placing it in the corner with almost equal distance to both the top and the end will make this dip in too severe and mean that there will be a dip in the frequency response where the piezo crossover to the woofer at 4Khz.

In any case, we are talking relatively minor changes but all being equal, I think it's fair to mention why it's placed as it is.

Last edited by Saturnus; 21st February 2013 at 10:45 AM.
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