Overclock.net › Forums › Consumer Electronics › Home Audio › Need to power 2x 50w speakers on the cheap
New Posts  All Forums:Forum Nav:

Need to power 2x 50w speakers on the cheap

post #1 of 17
Thread Starter 
So I found two old (think 30yrs) 12" twin cone speakers that used to be my Dad's. They are already in a cabinet, and I just need to wire them and power them. What would be the best solution for doing 100w on an amp, on the very cheap?

I found this:
http://www.jaycar.co.nz/productView.asp?ID=KC5470&keywords=amplifier&form=KEYWORD

but I'm not sure if that would be suitable, or easy enough to set up. I have access to transformers to go form 240 to other voltages if need be.
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
post #2 of 17
For that price and if you are looking for a project, build a LM3875 or LM3886 or LM4870etc. amplifier.

The LM3875 is arguably the best sounding, the other models get higher in power.

You can get kits, maybe avoid the China Ebay ones and go for something from audiosector.

Less money and you will be hard pressed to beat those chips for sound quality.

Here is an example for a stereo pair. Highly recommended, no affiliation. This amp is pretty simplistic, so don't be shy to add lot's of capacity to the PSU. (More or bigger filter caps, helps with the bass a bit cause that's how people are lol)

http://www.audiosector.com/lm3875.shtml

When you are building a "real" stereo, you don't need as many watts. Your speakers efficiency would dictate weather you need 135 w per channel or not. I never use more then 15w or 20w myself, and it is loud.

See if you can find out and specifications on the speakers.
Edited by All3n - 1/17/13 at 7:37pm
Main Rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770 ASRock Z87 Extreme4 Sapphire HD 7950 Corsair Vengeance 4 x 4GB DDR3 
Hard DriveHard DriveOptical DriveOS
Samsung 840 Pro 256 WD Caviar Black Samsung Windows 8 64 
MonitorKeyboardPowerCase
Triple LG 22EA63 IPS Cinema Screens Ducky DK9087 Dragon Antec HCG-620M (620w) Fractal R4 
MouseMouse PadAudioAudio
Sensei Raw steelseries 9HD Audioengine D1 DAC Sennheiser HD558 Cans 
AudioOtherOther
SE EL84 valve amplifier Hauppauge WinTV HVR-1800 Tuner Card Gyration remote control. 
  hide details  
Reply
Main Rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770 ASRock Z87 Extreme4 Sapphire HD 7950 Corsair Vengeance 4 x 4GB DDR3 
Hard DriveHard DriveOptical DriveOS
Samsung 840 Pro 256 WD Caviar Black Samsung Windows 8 64 
MonitorKeyboardPowerCase
Triple LG 22EA63 IPS Cinema Screens Ducky DK9087 Dragon Antec HCG-620M (620w) Fractal R4 
MouseMouse PadAudioAudio
Sensei Raw steelseries 9HD Audioengine D1 DAC Sennheiser HD558 Cans 
AudioOtherOther
SE EL84 valve amplifier Hauppauge WinTV HVR-1800 Tuner Card Gyration remote control. 
  hide details  
Reply
post #3 of 17
Thread Starter 
I actually have no idea when it comes to amplifiers. I was wondering if the one I linked was easy enough to setup. all the prebuilt ones are too expensive.
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
post #4 of 17
If I where you I would just buy a PA stereo power amp.

Something like this t.amp E400.


http://www.thomann.de/gb/the_tamp_e400.htm

That one is about $125. I'm sure you can find a lower power one for even cheaper. Pre built amps are not to expensive. You just need to look for the right kind.

Like this AudioSource AMP 50 25-Watt Stereo Amp --> http://www.amazon.com/AudioSource-AMP-50-25-Watt-Stereo/dp/B004U29IGG/ref=sr_1_2?s=electronics&ie=UTF8&qid=1358480636&sr=1-2&keywords=audio+source
Edited by Bit_reaper - 1/17/13 at 7:45pm
    
CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
  hide details  
Reply
post #5 of 17
Thread Starter 
Thanks! I will have a look at those. +rep to you all!
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
post #6 of 17
post #7 of 17
Make sure you take the cover off of those speakers and look at the drivers - if they have foam surrounds, it's likely that the foam has disintegrated. If they're not foam surrounds, its likely that they're not very efficient and you'll need at least a 100W to make a lot of noise. If the foam is intact, then you're good! I wouldn't go below 50Watt, no matter what. 12" speakers are not easy to move.

You could always go used.... This would be awesome:

http://www.ebay.com/itm/Vintage-FISHER-RS-2010-Stereo-Receiver-/130839028496?pt=Vintage_Electronics_R2&hash=item1e769d2310



Do not even think about the amp kit you posted. While I'm sure it'd sound amazing and have immense power, you'd likely spend over $300 getting that set up. Its class A, so you'd need a heat sink and fan system capable of dissipating over 400W, and I'd be shocked if you have a 60-0-60 volt, 600VA transformer laying around to drive it.

The most expensive part of any amp is the power supply. The transformer, if you don't have it, will probably be about $150. Heck, you're probably looking at $40 or so just in the filter caps! And then there's the matter of a case...
Tractorbox II
(6 items)
 
al dente
(11 items)
 
 
CPUMotherboardGraphicsRAM
Intel 4770k Gigabyte Z87-DS3H Nvidia Geforce 970 G.Skill DDR3-10700 
Hard DriveHard Drive
Samsung 840 Samsung 840 
CPUMotherboardRAMHard Drive
AMD Athlon 2 X2 240 ASRock 760GM-GS3 Kingston HyperX Blu Red Series 250Gig Seagate 
CoolingOSMonitor
Stock FX-6100 cooler Windows XP Wells Gardner 25K7194 
  hide details  
Reply
Tractorbox II
(6 items)
 
al dente
(11 items)
 
 
CPUMotherboardGraphicsRAM
Intel 4770k Gigabyte Z87-DS3H Nvidia Geforce 970 G.Skill DDR3-10700 
Hard DriveHard Drive
Samsung 840 Samsung 840 
CPUMotherboardRAMHard Drive
AMD Athlon 2 X2 240 ASRock 760GM-GS3 Kingston HyperX Blu Red Series 250Gig Seagate 
CoolingOSMonitor
Stock FX-6100 cooler Windows XP Wells Gardner 25K7194 
  hide details  
Reply
post #8 of 17
Quote:
Originally Posted by kevmatic View Post

Make sure you take the cover off of those speakers and look at the drivers - if they have foam surrounds, it's likely that the foam has disintegrated. If they're not foam surrounds, its likely that they're not very efficient and you'll need at least a 100W to make a lot of noise. If the foam is intact, then you're good! I wouldn't go below 50Watt, no matter what. 12" speakers are not easy to move.

You could always go used.... This would be awesome:

http://www.ebay.com/itm/Vintage-FISHER-RS-2010-Stereo-Receiver-/130839028496?pt=Vintage_Electronics_R2&hash=item1e769d2310



Do not even think about the amp kit you posted. While I'm sure it'd sound amazing and have immense power, you'd likely spend over $300 getting that set up. Its class A, so you'd need a heat sink and fan system capable of dissipating over 400W, and I'd be shocked if you have a 60-0-60 volt, 600VA transformer laying around to drive it.

The most expensive part of any amp is the power supply. The transformer, if you don't have it, will probably be about $150. Heck, you're probably looking at $40 or so just in the filter caps! And then there's the matter of a case...

Not necessarily. I had some vintage Sony speakers from the early 70's. When I got them in I can't remember 2000 or something they where in perfect working order. In daily heavy usage they lasted to around 2007 when after some spirited use of volume the foam gasket finally gave out and ripped.
    
CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
  hide details  
Reply
post #9 of 17
Thread Starter 
Quote:
Originally Posted by kevmatic View Post

Make sure you take the cover off of those speakers and look at the drivers - if they have foam surrounds, it's likely that the foam has disintegrated. If they're not foam surrounds, its likely that they're not very efficient and you'll need at least a 100W to make a lot of noise. If the foam is intact, then you're good! I wouldn't go below 50Watt, no matter what. 12" speakers are not easy to move.

You could always go used.... This would be awesome:

http://www.ebay.com/itm/Vintage-FISHER-RS-2010-Stereo-Receiver-/130839028496?pt=Vintage_Electronics_R2&hash=item1e769d2310



Do not even think about the amp kit you posted. While I'm sure it'd sound amazing and have immense power, you'd likely spend over $300 getting that set up. Its class A, so you'd need a heat sink and fan system capable of dissipating over 400W, and I'd be shocked if you have a 60-0-60 volt, 600VA transformer laying around to drive it.

The most expensive part of any amp is the power supply. The transformer, if you don't have it, will probably be about $150. Heck, you're probably looking at $40 or so just in the filter caps! And then there's the matter of a case...

Wow man, thanks for the help! thumb.gif Just to note, I did some digging, and they are Philips AD12100 HP8, which is a twin-cone 8ohm resistance, 50w. Also btw by speakers, I meant the drivers. They are perfectly intact, I've had them running off of an old radio head unit to test them. They are also already in a cabinet which my Dad used for PA stuff. I am just in the process of modernizing the cabinet with clamping latches and hinges etc. Another idea I had was to run it off a car head unit, since the driver I tested seems to do fine on an old radio that probably did 25w-ish.

EDIT: I can put pictures up if need be. I'm sure you'd love to see some vintage autio equipment.
Edited by TA4K - 1/22/13 at 4:15pm
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
post #10 of 17
Thread Starter 
nvm, will use this post for pics.






Edited by TA4K - 1/22/13 at 4:26pm
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Phenom II X4 975 Gigabyte GA-890XA-UD3 Reference GTX 580 AMD Black Edition DDR3 1600 
Hard DriveHard DriveOptical DriveCooling
160gb SATA 1tb SATA LG DVD RW Thermalright Silver Arrow SB-E Extreme 
OSMonitorMonitorKeyboard
Windows 7 Pro x64 Acer X183HQL 18.5" Transonic LCD TV Microsoft Sidewinder X4 
PowerCaseMouseMouse Pad
Cooler Master Extreme Power Plus 550w Silverstone Raven RV-03 Razer Deathadder SteelSeries QCK+ Large 
AudioOther
Creative PCI Sound Card Logitech G13 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Home Audio
Overclock.net › Forums › Consumer Electronics › Home Audio › Need to power 2x 50w speakers on the cheap