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Old 16th October 2005, 08:32 AM   #1
Hara is offline Hara  United States
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Default Subwoofer Replacement Amplifier

Hello,

As my first speaker project I want to replace the broken amplifier on a store bought JBL home theater subwoofer. (It now makes a hum sound when I plug it in, even when not connected to a source. Messing with the volume knob makes no difference) I figure I'll build a subwoofer amplifier kit to save money and to gain more amplifier building experience for future projects.

I have been searching for existing amps but have not found a solid recommendations for my Goals.

My Project Goals/Criteria
-Enough power for Home Theater, (explosions, rumble's etc)
-Low Level Inputs are fine
-Active Crossover so I can somewhat tune the speaker with the satellites
-Power Supply Recommendations
-Around 50-75 USD in price

This is more of a repair, not too concerned with audiophile quality as I am reusing the driver and enclosure. Also the overall quality of the Home Theater system is sufficient for my parents watching DVDs.

It is a bass reflex design and I can probably re-tune the length of the port and add additional stuffing. The Driver is 10 Inches and the box dimensions on the outside are 16Lx12 1/2Wx 17H (inches).

As always your recommendations and advice are greatly appreciated.
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Old 17th October 2005, 03:53 AM   #2
Hara is offline Hara  United States
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I think I've decided that a kit is not the best option at the moment. I was looking at this

http://www.ampslab.com/hx100.htm

but its already 75 USD and it doesn't come with a crossover, PS, and connectors.

Instead, I will use a plate amp special from parts express. It has everything I need and at a decent price.

http://www.partsexpress.com/pe/pshow...=300-792&DID=7

If I'm going to do DIY, I might as well start from the bottom up to get the most benefit. I'll probably build a subwoofer later, after I build my full range fe167 ML TLs.

Any criticism before I make the order?
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Old 17th October 2005, 03:31 PM   #3
Tweeker is offline Tweeker  United States
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If your going to buy a complete unit, spend an extra $9 and get the Rythmik Audio A250 instead. Its more powerful, more flexible, and higher fidelity.
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Old 17th October 2005, 03:59 PM   #4
Did it Himself
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If it's experience you want, fault finding and repairing your existing unit is by far the best way to go. It will probably be cheaper as well. It may just be part of the power supply that has gone u/s.
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Old 17th October 2005, 04:15 PM   #5
Apex Jr is offline Apex Jr  United States
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Default Another option

HARA:
I have another choice on my new arrival page.
A 150 Watt Cerwin Vega amp on sale at $85.00
http://www.apexjr.com/images/CERWINVEGASUB1.jpg

also my Apex "Junior" 120Watt amp for $89.95

Steve @ Apex Jr.
www.apexjr.com

P.S. I'm local to you and you can pick up at my warehouse.
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Old 17th October 2005, 04:20 PM   #6
Apex Jr is offline Apex Jr  United States
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Default OOOPs

http://www.apexjr.com/images/CERWINVEGASUBAMP1.jpg
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Old 17th October 2005, 06:52 PM   #7
Hara is offline Hara  United States
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Thanks for all your advice.

I will be getting one of the plate amps just so I can get the sub working right away. The recommendations you guys gave were great but my dad said to order the amp before you guys responded.

However, now I have more sub amp sources.

As for the broken amplifier, I'll probably go with Richie and repair it. It will take more time but thats OK because I can work on these projects whenever I have the time. I think it would make a good Tactile Transducer amp for my computer chair for gaming.
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