Suggestions needed for Amplifier - Dance Team - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st October 2010, 06:54 AM   #1
diyAudio Member
 
Join Date: Oct 2010
Red face Suggestions needed for Amplifier - Dance Team

Hi Everyone,

I've been on these forums nonstop for the past 2 days, and hunting ebay for a good deal on TA2020, or MK2050, and on Arjen Helder's store. I figure this will be a good place to ask this question.

Our dance team uses an old school boombox, but it has finally crapped out on us. I am in charge of getting us the new speakers. I found a good deal on passive bookshelf speakers (I think they are... feel free to judge!) at Radioshack here
Yamaha NS-6490 3-Way Bookshelf Speakers (Pair) - RadioShack.com

and I have been trying to find a low-cost way to amplify them - our budget for speakers is only around 80 bucks. Minus the speakers, so 50 for the amp. I would like to be able to use these at parties as well, as we are a dance team DIY is perfectly fine, as we are all engineers of some kind, but from what I have seen, project boxes, and switches, and everything add up too quickly...

In terms of audio quality, the most important thing is CLEAN and BALANCED sound. We need to hear the little things!

I am looking for any suggestions... the speakers specs are as follows on the last page. Thank you for all your time.
http://www.radioshack.com/graphics/u...0103_PM_EN.pdf
  Reply With Quote
Old 21st October 2010, 10:37 AM   #2
diyAudio Member
 
Join Date: Apr 2006
Location: Reykjavík
They're 8 Ohm and 90dB/W - that indicates to me that you'll want to power these at 24V or higher, e.g. aiming for 50W or so to get good volume out of them. The ideal amp IMO would be a TK2050 amp running at 24-32V. Might be too expensive though.

However, if you can find speakers that have a 2 or 4 Ohm impedance, and preferably a little higher sensitivity - say 92dB/W - then you can use a lower-powered amp. Then you can save on the amp - and on the power supply! Plus you'll be able to realistically use a cheap battery power supply for loud playback for long periods of time. Then the cheapest suitable amp is probably the 41Hz Amp6-BASIC-Sneaky for $26: 41Hz Audio:AMP6-BASIC-SNEAKY

These are very very good. Easy to assemble, they sound simply EXCELLENT, cheap, rugged.
  Reply With Quote
Old 21st October 2010, 07:24 PM   #3
diyAudio Member
 
Join Date: Jan 2010
The Amp6 is nice, but once you add a box, transformer, power supply, etc. its getting tight. I'd probably suggest checking the local pawnshops, Craigslist, classifieds and Goodwill and look for a small PA amp, power amp, or old stereo reciever or integrated amp in good working condition. If you don't have to move it around much, you can probably find a pretty powerful solid state reciever (50 to 100 watts per channel) fairly inexpensively; the big thing is to test it out pretty thoroughly before you lay out the cash. You might also check the same sources for small PA speakers - if you find a small PA amp it probably will have speakers with it, and they will likely be more efficient than the ones you listed, although those look very good for the price. Its easier to modify PA speakers to sound better than it is to modify inexpensive stereo speakers to be more efficient. If you can find a box to mount them in, the Sure Electronics 25 watt per channel class D amp from Parts Express would be another possibility. Any of the options we've discussed will be a big step up in sound quality from a boombox.
  Reply With Quote
Old 21st October 2010, 09:27 PM   #4
diyAudio Member
 
Join Date: Oct 2010
Yeah, that's what I'm worried about...everything adds up quite quickly.

I found this on craigslist, do you think it would suffice?

Sonax 330-P PA System

Sonax 330P, I can't find any information on them from google.
  Reply With Quote
Old 21st October 2010, 09:50 PM   #5
diyAudio Member
 
Join Date: Oct 2010
Also, how about these?

2x75 Watt Stereo Pwr Amp + Two Dual 8" Dual Horn Carpeted Enclosures

They are a little more than I wanted to spend, but I could always resell one on ebay, or keep it for my room?
  Reply With Quote
Old 21st October 2010, 10:07 PM   #6
diyAudio Member
 
Join Date: Jan 2010
That should work great. Just try it out before buying, check to make sure sound is coming from each speaker about equally, that there aren't any major "funny noises", crank it up to at least 2/3 power and make sure nothing blows. As thats a simple PA system, it will have a somewhat limited bandwidth and will likely be mono, not stereo. Just get some adapters from Radio Shack to go from the RCA plugs your CD player (or other source) probably has to the likely 1/4 inch phono plugs this thing has, and put each output into one input. It won't sound as good as a good home stereo as far as "true, accurate sound", but can safely play loud, is built to be hauled around if needed, and with a microphone can also be used to discuss the dances with an audience or be heard over boisterous kids. If it has some mild crackling noises only when one of the controls is turned thats probably okay and can be likely improved with some tuner cleaner. For the money we're talking, its a great solution, and should kick the snot out of your old boombox.
  Reply With Quote
Old 22nd October 2010, 12:20 AM   #7
diyAudio Member
 
Join Date: Oct 2010
Hey Racket I'm leaning towards my second link - everything seems much newer and simpler. It also feels like I'm getting more value in terms of the amp. Could you comment on those? How are the speakers inside the enclosure?
New Pro Audio DJ 800 Watt 8" 4-Way Full Range Speaker - eBay (item 400165917269 end time Oct-23-10 12:49:39 PDT)
  Reply With Quote
Old 22nd October 2010, 01:02 AM   #8
diyAudio Member
 
Join Date: Jan 2010
The Sonax is a vintage '70s set, possibly made in Canada by Traynor. Traynor made some really well built stuff. If it currently works well, it should be pretty reliable, at least until the electrolytic caps have to be replaced. Its definitely not "high end" by any stretch, but should be fairly well built. I've never seen a Sonax amp before in person, so thats a bit of an educated guess.

The Pyle amp is kind of a budget brand and will be cheaply built, but it is fairly recent and MAY be reliable. The 75 watt rating is likely to be quite optimistic. The speakers mated to it in that ad are basically very inexpensive car stereo stuff. I'd guess the sound output using that amp to drive those speakers will be on the lowish side - the fact the speakers are rated for up to 800 watts (probably also "optimistic") suggests the stated sensitivity of 93 is also unlikely under real conditions.

If I were making the call, I'd go with the Sonax, but that is partly based on my perception that the basic construction is more solid and that I could more easily update the drivers and "voice" the speakers to my liking, and that the amp circuitry will be simple and easy to repair. It is absolutely worth $60, particularly for your situation, if its in reasonable working condition. I'd definitely go check it out, and probably soon, as it will probably be snatched up by some kid trying to start a garage band. The other stuff you posted MIGHT be worth the money, I don't know.

Resale value on either set will be low, but to the right person the Sonax would probably be worth more.
  Reply With Quote
Old 22nd October 2010, 07:01 PM   #9
diyAudio Member
 
Join Date: Oct 2010
Good news! I talked to our finance guy on the team, and he said he'll up to the budget to $200 (to match how much we spent on the last boombox). He said the other teams were using at the CM-30 from Roland, and to check it out.
Roland U.S. - CM-30: Cube Monitor
From what I see, this is a speaker and amp built in. Im trying to get away from that, as it will be easier to replace components rather than the whole thing. Can you guys imagine any setup that will be extremely portable? What I am picturing is a suitcase sort of thing, where the speaker has two wheels on the bottom, the amp on top, and I can extend something and roll it everywhere.
With this HUGE budget increase :-D , do you think something like this is possible?
  Reply With Quote
Old 22nd October 2010, 11:01 PM   #10
diyAudio Member
 
Join Date: Jan 2010
The Roland would be okay. Its very portable, more powerful than a boombox, but not by much. If you buy it new from a vendor with a return policy I wouldn't lose a lot of sleep over any component part being separately replacable in this price range. You might also consider this - its portable (but less portable than the Roland), but more powerful.
Buy Kustom Profile 100 Portable PA System | Live Sound Packages | Musician's Friend
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Suggestions needed for improving Rogers Cadet II PP power amplifier Sanjiv Sahgal Tubes / Valves 10 23rd May 2012 09:26 AM
Dance Floor Audio Setup jstarks4444 Everything Else 10 20th August 2009 05:17 PM
Lance Armstrong and Team Radio Shack pro cycling team Andersonix Everything Else 18 29th July 2009 04:39 PM
small efficient dance music sub neptunekiev Subwoofers 14 5th December 2004 02:07 AM


New To Site? Need Help?

All times are GMT. The time now is 12:08 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2