Each class took part in our special DT day. They used pneumatics, electric circuits and pulleys and gears. They all created a range of moving mechanisms. Some year groups adapted their designs and even raced their boats and bugs! All children really enjoyed the day and have started to design new mechanisms for our follow up day. During our star of the week assembly each class recognised a child who had developed their skills and showed a natural flare for design. Well done!
I’m letting go of this beast of an axe. Reverend Rumblefish 5 is easily the most aggressive sounding passive bass I’ve ever played. Killer studio axe. It’s marked #88. Everything is original, slight discoloration on bottom bout and some minor dings in neck. I’ve tried to capture in pics.
I’ve always wanted one of these, so someone needs to buy it before I get reckless and buy it myself.
FYI: This bass is a STEAL at this price. There’s one like it (except maple FB) on Reverb.com for $1200, and it’s a much later model.
Does it follow that if speaker a is the same size, wattage and has the same size voice coil as speaker b then it will also be "tuned" to the box? If not what else am I missing?
No, it is much more complicated than that. See http://www.kbapps.com/audiodesign/calculators/index.htm. You have to deal with the Thiele-Small parameters of the system (volume equivalence or compliance, mechanical impedance, electrical impedance, Q - the "peakiness" of response or damping ratio, resonant freq., etc.). This is why designing bass enclosures is not that simple. Even using these parameters alone will not guarantee success, but they can yield reasonable results. I believe Joris has done a lot of this kind of design, so you might seek his advice on it. If you are truly interested in it, I'd recommend doing a lot of reading on it first.
Thanks for the quick response. I will read that right now. I am not looking into designing a box. I just want to add good speakers to a existing box. I have had a hard time finding the model number of the speakers that originally belonged there so I am kinda trying to reinvent the wheel as it were.
I understand that situation. A few years back, the woofers in my AR bookshelf speakers died (the foam surrounds rotted out), so I bought some replacements from Parts Express. I tried as best as I could to find something I thought would work well, and it turned out they were decent. These were acoustic suspension speakers (closed boxes, with no porting), BTW.
Recently I have considered upgrading the drivers in my Carvin 2x10 with ones that will handle more power and be more efficient. I think I found some that might work, and I used the calculator in the link I gave before to confirm it. I still have a margin of doubt, though. Well, don't let my previous comments deter you, but go into it prepared, with eyes wide open - or at least with lots of money (in case you need to try a bunch of different drivers to find a good match!).
You could try using the design calculator I pointed out to find a driver that you *think* might work. Then with the T-S parameters for the drivers and box dimensions, Joris might be willing to confirm whether it would be a good choice. He has offered such help to others in the past. It's worth asking him. Good luck!
Are you talking about the sweet 2x15 cab you just got? That thing looked like it was a copy of a Sunn 2x15 cab with the center horn-type port. The Peavey probably came with Black Widow 15's for Bass. You can order these from a Peavey dealer. The Sunn came with JBL D-140F's, supposedly one of the holy grails of bass speakers. These would probably work well in that cab, but they are expensive as sin. The Peavey Black Widows I'd read on the WeberVST board were a copy of the JBL's, so it would make sense that the cabinet is probably a close copy.
I'd at least check the prices on the Peavey Black Widows at a local dealer. You could probably talk to Peavey and put in the correct speakers that were originally in that cab, and you'll get good results with little risk of having a mismatch. I'd probably go with the 1501DT-4 and wire in series for 8 ohms, just cause I always go for the classic old sound. Here's the spec sheet on the Black Widow family:
I'm using an Altec 421 in a Peavey single 15 enclosure with great results, although they aren't high power like the Peavey BW or the JBL 140's.
I got this Peavey 2x15 for $100 and while it sounded decent with the wifeys keyboard it didn't do too well for bass. It seemed way too light and when I opened it up... tadah!! Fisher speakers.
I am not compaining though, the enclosure is in good shape so I think $100 is fair anyways. You guys have been great help!!
g- check out my reply in your thread re: your 2x15 peavey. as throbbinnut mentioned, i'm also thinking that your 2x15 originally came with 15" BWs. i'm also wondering how carvin's 15s would work in that box.
That's Mr. Goober Brukowski to you Ubie! Carvins are a good idea. I am going to be measuring the cab and using that to attempt to learn what speaker would be tuned to it. Then I will know what to get.
If I can't figure it out that way, then I will try to get the peavey speakers on the chance that they should work best with a peavey cab... time will tell.
Anyone know where black widows can be bought by themselves and (hopefully) approximately how much they go for?
These centres are straining to cope with an increasing number of the displaced villagers, putting local authorities on high alert for outbreaks of diseases. Dr Nguyen Thanh Cong, Deputy Director of the Hoang Anh Gia Lai Medical University Hospital, together with a team of Vietnamese medical workers from the hospital, arrived in Laos just one day after the dam broke. They have been staying at a temporary camp set up to accommodate Lao people evacuated from 13 villages affected by the accident. Hundreds of these villagers have received health checkups from the team. Thanks to concerted relief efforts between the Lao government and many international organisations, the supply of foods, clean water and other necessities for the survivors has been done quite well and become more stable, according to Cong. But the most challenging issue at the moment is that the rainy season has arrived in Laos. The mass gathering of the displaced villagers in the evacuation centres is posing a great medical challenge to the local authorities, the doctor explained, adding that these people are at high risk of contracting to communicable diseases like cholera and E.Coli infection. Lao authorities have been well aware of the alarming issue and in the past several days, a large number of doctors and nurses have been mobilized from across the country to keep an eye on high-risk spots in Sanamxay and Paksong districts as well as villages where people were temporarily evacuated to, Colonel Vanpheng Phuangsavadi from the General Logistics Department of… [Read full story]
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CPVCC General Secretary Nguyen Phu Trong at the working session (Source: CPV) The Party leader expressed his hope that popularization and education workers continue upholding traditions to complete assigned tasks. He lauded achievements made by commission over the past time. According to VNA, the Party chief said as a think-tank of the CPVCC, the Politburo and Secretariat, the commission plays an important role in Party building in terms of politics and ideology, dissemination of Party viewpoints and guidelines, press and publishing, culture and education. After the 12th National Party Congress and amidst rapid and complicated developments in the region and the world, the commission and popularization-education sector have always closely followed the Party’s guidelines, working agendas of the CPVCC, Politburo and Secretariat, scored positive achievements and made important contributions to the country’s common success, he said. Agreeing with the commission’s report detailing its seven achievements, seven shortcomings and nine key tasks for the near future, the leader said the first task of the commission and the sector is building the Party in terms of politics and ideology, including Marxism-Leninism and Ho Chi Minh thought, adding that theoretical research, education and dissemination are basic and important issues that decide on orientation to political thought. According to him, though the press has developed rapidly with rich and effective contents, communications via words of mouth remain tardy while management in news on the Internet is limited. Moreover, the fight against wrongful and distorted allegations by hostile forces is yet to rally a collective… [Read full story]
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