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#1
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Infinity BU-120 subwoofer "machine gun" !
Hi, all. I'd appreciate some informed opinion.
I'm looking for a solution to a dead amplifier in my Infinity BU-120 sub. First, read these reviews - what an eye opener! http://ecoustics.audioreview.com/psc...6_2741crx.aspx The Infinity amp. is a "POS". Fortunately, I have very little invested in my unit. The amp. has been scrapped for spare parts (mains transformer, terminals, that's about it - the rest is junk.) I've screwed a board over the hole (painted matte black) and mounted regular speaker terminals on it so it's now a passive unit - looks good and sounds very good, too! It's now running off one half of a Yamaha M4 with a 50 Hz LP filter (a bit of a waste of an M4 but I had it lying around.) Now I've got plans for the M4, i.e. for a proper stereo system, so I need a dedicated sub amplifier recommendation. I would prefer linear to Class D. Here's are my thoughts to date: 1. Find a cheap surplus stereo receiver and use 1/2 of that (rather low powered at 20 - 25 watts but I have another passive sub for the other channel so I could get 50 watts, or so. The idea works, did it a couple of years ago.) 2. ditto, integrated amplifier (might get up to 100 watts, but likely not cheaply.) 3. Find a used s/s monobloc amplifier (From where? What type? Cost?) 4. Build a custom s/s monobloc from a 100 watt linear power module ( I have the technical skills and resources, also likely cheap enough - but a bit time consuming.) 5. Find another, better quality Class D sub. amplifier. (From where? What brand? Cost?) 6. Other? Thanks for all replies. Cheers, Roger |
#2
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Infinity BU-120 subwoofer "machine gun" !
MCM Electronics sells replacement subwoofer amp plates / modules. Can't say
if they are any good, or whether the price is right. Can't be too much worse than what you had, though. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Engineer" wrote in message ... Hi, all. I'd appreciate some informed opinion. I'm looking for a solution to a dead amplifier in my Infinity BU-120 sub. First, read these reviews - what an eye opener! http://ecoustics.audioreview.com/psc...6_2741crx.aspx The Infinity amp. is a "POS". Fortunately, I have very little invested in my unit. The amp. has been scrapped for spare parts (mains transformer, terminals, that's about it - the rest is junk.) I've screwed a board over the hole (painted matte black) and mounted regular speaker terminals on it so it's now a passive unit - looks good and sounds very good, too! It's now running off one half of a Yamaha M4 with a 50 Hz LP filter (a bit of a waste of an M4 but I had it lying around.) Now I've got plans for the M4, i.e. for a proper stereo system, so I need a dedicated sub amplifier recommendation. I would prefer linear to Class D. Here's are my thoughts to date: 1. Find a cheap surplus stereo receiver and use 1/2 of that (rather low powered at 20 - 25 watts but I have another passive sub for the other channel so I could get 50 watts, or so. The idea works, did it a couple of years ago.) 2. ditto, integrated amplifier (might get up to 100 watts, but likely not cheaply.) 3. Find a used s/s monobloc amplifier (From where? What type? Cost?) 4. Build a custom s/s monobloc from a 100 watt linear power module ( I have the technical skills and resources, also likely cheap enough - but a bit time consuming.) 5. Find another, better quality Class D sub. amplifier. (From where? What brand? Cost?) 6. Other? Thanks for all replies. Cheers, Roger |
#3
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Infinity BU-120 subwoofer "machine gun" !
"Engineer" wrote in message ... Hi, all. I'd appreciate some informed opinion. I'm looking for a solution to a dead amplifier in my Infinity BU-120 sub. First, read these reviews - what an eye opener! http://ecoustics.audioreview.com/psc...6_2741crx.aspx The Infinity amp. is a "POS". Fortunately, I have very little invested in my unit. The amp. has been scrapped for spare parts (mains transformer, terminals, that's about it - the rest is junk.) I've screwed a board over the hole (painted matte black) and mounted regular speaker terminals on it so it's now a passive unit - looks good and sounds very good, too! Try www.adireaudio.com and look at their subwoofer amps. Anything you could want in terms of power. I have one in my own sub and it's done very well for me. It's now running off one half of a Yamaha M4 with a 50 Hz LP filter (a bit of a waste of an M4 but I had it lying around.) Now I've got plans for the M4, i.e. for a proper stereo system, so I need a dedicated sub amplifier recommendation. I would prefer linear to Class D. Here's are my thoughts to date: 1. Find a cheap surplus stereo receiver and use 1/2 of that (rather low powered at 20 - 25 watts but I have another passive sub for the other channel so I could get 50 watts, or so. The idea works, did it a couple of years ago.) 2. ditto, integrated amplifier (might get up to 100 watts, but likely not cheaply.) 3. Find a used s/s monobloc amplifier (From where? What type? Cost?) 4. Build a custom s/s monobloc from a 100 watt linear power module ( I have the technical skills and resources, also likely cheap enough - but a bit time consuming.) 5. Find another, better quality Class D sub. amplifier. (From where? What brand? Cost?) 6. Other? Thanks for all replies. Cheers, Roger |
#4
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Infinity BU-120 subwoofer "machine gun" !
"Michael McKelvy" wrote in message
ink.net... "Engineer" wrote in message ... Hi, all. I'd appreciate some informed opinion. I'm looking for a solution to a dead amplifier in my Infinity BU-120 sub. First, read these reviews - what an eye opener! http://ecoustics.audioreview.com/psc...6_2741crx.aspx The Infinity amp. is a "POS". Fortunately, I have very little invested in my unit. The amp. has been scrapped for spare parts (mains transformer, terminals, that's about it - the rest is junk.) I've screwed a board over the hole (painted matte black) and mounted regular speaker terminals on it so it's now a passive unit - looks good and sounds very good, too! Try www.adireaudio.com and look at their subwoofer amps. Anything you could want in terms of power. I have one in my own sub and it's done very well for me. A very good lead, thanks. Great products. The AVA250 is just what I want but a bit pricey for us Canadians after shipping, an X/C rate of 75 cents US per CDN$, then our 15% sales tax, plus an insulting $5 sales tax collection charge by the bandits at "Revenue Canada"! Starting at US$179.00, I make that close to CDN$300 "FOB my house".. so, still looking! BTW, the dead "POS" Infinity amplfier has an LM2324N quad Op Amp, so that might end up as the front end of a home brewed sub-monobloc (audio gain plus multipole LP filter.) Same for the power supply, although it's a bit small - I estimate the transformer to be barely 50 watts continuous at 30-0-30 VAC, say +/- 40 VDC output. Assuming the PA module can swing the output +/- 35 volts that gives about 75 watts into 8 ohms (not continuous, either.) I think the Infinity driver (not a "POS", incidently, quite a nice 12 inch unit) may be 6 ohms (it has 4.8 ohms DC resistance), so I might just get 100 watts (not continuous).. so, still thinking, too... Cheers, Roger (snip) |
#5
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Infinity BU-120 subwoofer "machine gun" !
Check the web for "Parts Express". They have some good-looking plate
amplifiers that you could just screw over the hole. Engineer wrote: Hi, all. I'd appreciate some informed opinion. I'm looking for a solution to a dead amplifier in my Infinity BU-120 sub. First, read these reviews - what an eye opener! http://ecoustics.audioreview.com/psc...ers/Subwoofers BU-120/PRD_119596_2741crx.aspx The Infinity amp. is a "POS". Fortunately, I have very little invested in my unit. The amp. has been scrapped for spare parts (mains transformer, terminals, that's about it - the rest is junk.) I've screwed a board over the hole (painted matte black) and mounted regular speaker terminals on it so it's now a passive unit - looks good and sounds very good, too! It's now running off one half of a Yamaha M4 with a 50 Hz LP filter (a bit of a waste of an M4 but I had it lying around.) Now I've got plans for the M4, i.e. for a proper stereo system, so I need a dedicated sub amplifier recommendation. I would prefer linear to Class D. Here's are my thoughts to date: 1. Find a cheap surplus stereo receiver and use 1/2 of that (rather low powered at 20 - 25 watts but I have another passive sub for the other channel so I could get 50 watts, or so. The idea works, did it a couple of years ago.) 2. ditto, integrated amplifier (might get up to 100 watts, but likely not cheaply.) 3. Find a used s/s monobloc amplifier (From where? What type? Cost?) 4. Build a custom s/s monobloc from a 100 watt linear power module ( I have the technical skills and resources, also likely cheap enough - but a bit time consuming.) 5. Find another, better quality Class D sub. amplifier. (From where? What brand? Cost?) 6. Other? Thanks for all replies. Cheers, Roger |
#6
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Infinity BU-120 subwoofer "machine gun" !
"Stu R" wrote in message
news Check the web for "Parts Express". They have some good-looking plate amplifiers that you could just screw over the hole. Stu, I think you hit the jackpot! The 300-804 is exactly what I want and the landed price in Canada seems to be a just about affordable at CDN$190, or so. It also does more that I could ever design, build and test in several W/E's, with more protection than my present Yamaha M4 set up! Many thanks, Cheers, Roger (snip) |
#7
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Infinity BU-120 subwoofer "machine gun" !
"Engineer" wrote in message
... "Stu R" wrote in message news Check the web for "Parts Express". They have some good-looking plate amplifiers that you could just screw over the hole. Stu, I think you hit the jackpot! The 300-804 is exactly what I want and the landed price in Canada seems to be a just about affordable at CDN$190, or so. It also does more that I could ever design, build and test in several W/E's, with more protection than my present Yamaha M4 set up! Many thanks, Cheers, Roger (snip) Damn, I was wrong! "Partsexpress" only have free shipping in the US. I can't believe this c**p! Where's free trade when you need it? I can more or less live with a 75 cent dollar since most Canadians (but not me!) have voted in governments over the years that are determined to keep us some 25% less productive than the Americans - even while getting free continental defense but still bitching about American imperialism and defining ourselves as "not-American. But to have to pay over CDN$220 (landed) for a unit well priced at US$120 F.O.B. anywhere in the US is a bloody disgrace. Cheers, well almost... Roger |
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