I remember hearing one of those subs from out in the parking lot of an audio shop, I even checked the sky to see where the thunder was coming from. Really incredible sub, nice find and great repair. I'd have bought it on sight as well.
I remember those. They were sold in the more high end shops in Norway, and were quite pricey. I opted for a Yamaha YST SW 1500 instead. (Still have it)
GravaStar Loudspeakers are something I really like and want! they have such a neat design and almost look like a little robot. Also great work on fixing it!
It was probably hitting max throw a few times, it was shaking everything in my garage , one thing you might be noticing is how nothing other than bass comes out that's a sign of a very clean crossover. Thanks for the comment 👍
My sunfire true 12" i removed the amp...replaced the radiator because the wood split from the cone..with an earthquake radiator.. Crown xls2500 runs is 90hz and below
@@Sawdust_and_Circuits All power amplifiers have some degree of capacitor power storage. 2700w peak is more likely. There's no chance it is sustaining that amount of power for any noticeable length of time. I even doubt 500w continuous just looking at the design. We all know that power delivery has very little correspondence to sound pressure output anyway...
If I remember correctly, this subwoofer powers the amplifier directly from the mains. You can see the big bridge rectifier and cap on the rear panel. The small transformer only feeds the input stage which is isolated from the power amp using optocouplers
@@moffarocka3537 Ahh now that's interesting. I've not seen this before, but would make more sense if the power specifications are true. I suppose there would be some pretty serious and foolproof limiter circuitry in place to make sure the driver isn't over-volted.
It was making bass the range on this sub is very low like 75hz it was hitting extents a few times , I was running a bass test track, I used to build car systems smoked many a sub with those but wanted to show what is could do 😉
Bob carver my have built the amplifier and power supply but he didn't build and design the actual subwoofer that being used in the sun fire subwoofers . Wich is also none to be one of the best designs and still really popular. The frame of the woofer used in lots of subwoofer and highly sought after. The builder was named telo stompler they call the speaker frame a TC he actually design most of the sun fire woofers from what i under stand. He's well none name to most car subwoofer buiders. 💯🫡😉👍✌️
I heard some of the same still great info. I also noticed only a few sub where ever signed bob carver and not this one . The amp is strange because it's not widely used elsewhere 🙄
@Sawdust_and_Circuits have you seen or heard of velodyne speakers they also make a similar style sub woofer with a small compact box model spl 12 and they also have use 1000w amp plate. I'd say there the closest in sound and build design. Both can play really low. The amp kinda reminds me of the Dayton audio amplifier . 💯👍👌
I always wanted one of those back then too. Great find!
Yeah they are very distinctive I knew immediately when I saw it , thanks for the comment.
I remember hearing one of those subs from out in the parking lot of an audio shop, I even checked the sky to see where the thunder was coming from. Really incredible sub, nice find and great repair. I'd have bought it on sight as well.
Thanks I grabbed it not even having a cart was glad my daughter grabbed one that thing is dense 😉
I've wanted this sub since the early 2000s. Sucks that I've never been able to find one that was working.
If you felt comfortable fixing one , that could be a good way 😀
I remember those. They were sold in the more high end shops in Norway, and were quite pricey. I opted for a Yamaha YST SW 1500 instead. (Still have it)
Those are great my other sub is a down firing ported as well 😀
I think i just found the sub that i have always wanted
I just love the excursion rings come on there huge 😉
Please do more speaker related video, diy, hifi, amp, subwoofer or restoration. Im subscribing 😊
Thanks this one was fun 😃
Bob Ross is that you?
Boss Ross would make a beautiful speaker I bet 👌
GravaStar Loudspeakers are something I really like and want! they have such a neat design and almost look like a little robot. Also great work on fixing it!
Thanks for the comment, I'll have to check those out
I'd try hard not to giggle like a little school girl if I found one of these at a thrift store.
Seems like alot more days not finding great stuff , every once in awhile you find something great 😃
Throwing this out at all is a crime ong Shame they didn't realize they could just wire the sub up manually to a amp and crossover
It was probably hitting max throw a few times, it was shaking everything in my garage , one thing you might be noticing is how nothing other than bass comes out that's a sign of a very clean crossover. Thanks for the comment 👍
My sunfire true 12" i removed the amp...replaced the radiator because the wood split from the cone..with an earthquake radiator..
Crown xls2500 runs is 90hz and below
Hint. When fixing stuff, fire it up *before* you put all the screws in. That nasty distortion at the end needs to be attended to also.
Some of the noise is the garage door , it was running a bass test also they can overextend a sub . Thanks for the comment
I have separated the spider from the cone doing that exact same thing!!! Not cool lol!!
We all know you tested it before you put it back together. I know I'd look at those 12 screws and think about testing it first.
Was there 12 I didn't count 😕 all I did was make sure the hum was gone the video was genuine 😅
@@Sawdust_and_Circuits OK
Where is the power supply? I don’t think that little low frequency transformer can powering this big subwoofer
This brand was known for a high voltage amp circuit, the big current spikes come from the two large capacitors .
Cant be much power with so small transformer...🤔
it uses a capacitor driven amp at high voltage i believe the spec are something like 500w continuous and 2700w surge not bad considering
@@Sawdust_and_Circuits All power amplifiers have some degree of capacitor power storage. 2700w peak is more likely.
There's no chance it is sustaining that amount of power for any noticeable length of time. I even doubt 500w continuous just looking at the design. We all know that power delivery has very little correspondence to sound pressure output anyway...
If I remember correctly, this subwoofer powers the amplifier directly from the mains. You can see the big bridge rectifier and cap on the rear panel.
The small transformer only feeds the input stage which is isolated from the power amp using optocouplers
@@moffarocka3537 Ahh now that's interesting. I've not seen this before, but would make more sense if the power specifications are true.
I suppose there would be some pretty serious and foolproof limiter circuitry in place to make sure the driver isn't over-volted.
@@moffarocka3537 315v. dc?
Just me or is that shit making horrible mechanical noises and no real bass
It was making bass the range on this sub is very low like 75hz it was hitting extents a few times , I was running a bass test track, I used to build car systems smoked many a sub with those but wanted to show what is could do 😉
Bob carver my have built the amplifier and power supply but he didn't build and design the actual subwoofer that being used in the sun fire subwoofers . Wich is also none to be one of the best designs and still really popular. The frame of the woofer used in lots of subwoofer and highly sought after. The builder was named telo stompler they call the speaker frame a TC he actually design most of the sun fire woofers from what i under stand. He's well none name to most car subwoofer buiders. 💯🫡😉👍✌️
I heard some of the same still great info. I also noticed only a few sub where ever signed bob carver and not this one . The amp is strange because it's not widely used elsewhere 🙄
@Sawdust_and_Circuits have you seen or heard of velodyne speakers they also make a similar style sub woofer with a small compact box model spl 12 and they also have use 1000w amp plate. I'd say there the closest in sound and build design. Both can play really low. The amp kinda reminds me of the Dayton audio amplifier . 💯👍👌
Yes they mostly made front firing sub but they did have a kevlar one i believe