Infinity BU-120 subwoofer "machine gun" !

Archived from groups: rec.audio.tech (More info?)

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/p [...] 41crx.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

Archived from groups: rec.audio.tech (More info?)

"Engineer" <notme@nowhere.com> wrote in message
news:jaXOc.375$PR6.2736@newscontent-01.sprint.ca...
> 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/p [...] 41crx.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
>
>
>
>
>

Archived from groups: rec.audio.tech (More info?)

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/p [...] 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

Archived from groups: rec.audio.tech (More info?)

"Engineer" <notme@nowhere.com> wrote in message
news:YQXPc.677$PR6.5733@newscontent-01.sprint.ca...
> "Stu R" <stu-r@sbcglobal.net> wrote in message
> newshVPc.2999$u21.2034@newssvr24.news.prodigy.com...
> > 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