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Message |
T
Guest
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 Posted:
Sat Apr 09, 2005 4:22 pm Post subject:
Suggest a decent stand alone amp for a sub |
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I was given an subwoofer, it needs between 100 and 250 watts to run
according to the manufacturer.
Since I'll be running it from the Surround Sound receiver via the sub
out, it'll need an amp to power it directly.
Is there any capacity subs need in an amp to look out for?
tia,
TBerk
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Mark D. Zacharias
Guest
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| Posted:
Tue Apr 12, 2005 10:05 am Post subject:
Re: Suggest a decent stand alone amp for a sub |
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T wrote:
| Quote: | I was given an subwoofer, it needs between 100 and 250 watts to run
according to the manufacturer.
Since I'll be running it from the Surround Sound receiver via the sub
out, it'll need an amp to power it directly.
Is there any capacity subs need in an amp to look out for?
tia,
TBerk
|
You could actually use just about any stereo amp or receiver in the power
range you're interested in. An integrated amp with pre-out / main in jacks
for example. If you're more into higher-end stuff there's lots of decent
separate power amps on eBay. Some are bridgeable, which might be ideal for
you if the woofer impedance is in the 8 ohm range. That way you're not
letting one channel idle, but that's not a problem for solid-state amps
anyway.
Mark Z. |
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T
Guest
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| Posted:
Thu Apr 14, 2005 11:30 am Post subject:
Re: Suggest a decent stand alone amp for a sub |
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Mark D. Zacharias wrote:
| Quote: | T wrote:
I was given an subwoofer, it needs between 100 and 250 watts to run
according to the manufacturer.
Since I'll be running it from the Surround Sound receiver via the sub
out, it'll need an amp to power it directly.
Is there any capacity subs need in an amp to look out for?
tia,
TBerk
You could actually use just about any stereo amp or receiver in the power
range you're interested in. An integrated amp with pre-out / main in jacks
for example. If you're more into higher-end stuff there's lots of decent
separate power amps on eBay. Some are bridgeable, which might be ideal for
you if the woofer impedance is in the 8 ohm range. That way you're not
letting one channel idle, but that's not a problem for solid-state amps
anyway.
Mark Z.
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Heh heh. OK then- How about this Sony STR-7055 I picked up from a
friend?; it was made around 1975.
TBerk |
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Mark D. Zacharias
Guest
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| Posted:
Fri Apr 15, 2005 10:01 am Post subject:
Re: Suggest a decent stand alone amp for a sub |
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T wrote:
| Quote: | Mark D. Zacharias wrote:
T wrote:
I was given an subwoofer, it needs between 100 and 250 watts to run
according to the manufacturer.
Since I'll be running it from the Surround Sound receiver via the
sub out, it'll need an amp to power it directly.
Is there any capacity subs need in an amp to look out for?
tia,
TBerk
You could actually use just about any stereo amp or receiver in the
power range you're interested in. An integrated amp with pre-out /
main in jacks for example. If you're more into higher-end stuff
there's lots of decent separate power amps on eBay. Some are
bridgeable, which might be ideal for you if the woofer impedance is
in the 8 ohm range. That way you're not letting one channel idle,
but that's not a problem for solid-state amps anyway.
Mark Z.
Heh heh. OK then- How about this Sony STR-7055 I picked up from a
friend?; it was made around 1975.
TBerk
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If it's functioning correctly, I don't see why not. All the better if it has
Main-In jacks, to bypass the receivers' preamp section. The volume would be
controlled by your surround receiver.
Most people don't realize it, but subs generally don't require that much
power. There are exceptions, of course. People who seriously over-do the
bass boost and want PA level volume, for example. It's a fairly rare system
that would need over 50 watts for the sub, and even that is pretty generous.
Mark Z. |
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Cyrus
Guest
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| Posted:
Fri Apr 15, 2005 10:36 am Post subject:
Re: Suggest a decent stand alone amp for a sub |
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In article <1113559263.422ba9d586fcc84b5362ac865b5b459e@teranews>,
"Mark D. Zacharias" <spammenot@yis.us> wrote:
| Quote: | Most people don't realize it, but subs generally don't require that much
power. There are exceptions, of course. People who seriously over-do the
bass boost and want PA level volume, for example. It's a fairly rare system
that would need over 50 watts for the sub, and even that is pretty generous.
Mark Z.
|
IMHO Closer to 250 clean watts is nice to have for headroom. That is of
course if we're talking sensitive sub alignments (lower Qtc systems
including infinite baffle and/or line array).
Even this is a gross generalization and can mean squat in certain
situations.
There is also no mention of mains/surrounds wattage or system bandwidth
to take into consideration. Many many variables.
hth,
--
Cyrus
*coughcasaucedoprodigynetcough* |
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Engineer
Guest
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| Posted:
Fri Apr 15, 2005 10:51 pm Post subject:
Re: Suggest a decent stand alone amp for a sub |
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"Mark D. Zacharias" <spammenot@yis.us> wrote in message
news:1113300311.48a5b4b3a87134f3692514c7c53bdd76@teranews...
| Quote: | T wrote:
I was given an subwoofer, it needs between 100 and 250 watts to run
according to the manufacturer.
Since I'll be running it from the Surround Sound receiver via the
sub
out, it'll need an amp to power it directly.
Is there any capacity subs need in an amp to look out for?
tia,
TBerk
You could actually use just about any stereo amp or receiver in the
power range you're interested in. An integrated amp with pre-out /
main in jacks for example. If you're more into higher-end stuff
there's lots of decent separate power amps on eBay. Some are
bridgeable, which might be ideal for you if the woofer impedance is
in the 8 ohm range. That way you're not letting one channel idle,
but that's not a problem for solid-state amps anyway.
Mark Z.
|
I used to do this with two passive subs so both channels of the stereo
amp. were used. However, the receiver "sub out" crossed over at around
200 Hz - too high! I built an active filter to roll off around 100 Hz
(better) but the 6 dB/octave was not very good. Later I used a
dedicated sub amp. from PartsExpress with a variable cut off at, IIRC,
some 24 dB/octave, 50 to 150 Hz. It now sits at 90 Hz.
Cheers,
Roger |
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T
Guest
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| Posted:
Sat Apr 16, 2005 6:11 am Post subject:
Re: Suggest a decent stand alone amp for a sub |
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Engineer wrote:
| Quote: | "Mark D. Zacharias" <spammenot@yis.us> wrote in message
news:1113300311.48a5b4b3a87134f3692514c7c53bdd76@teranews...
T wrote:
I was given an subwoofer, it needs between 100 and 250 watts to run
according to the manufacturer.
Since I'll be running it from the Surround Sound receiver via the
sub
out, it'll need an amp to power it directly.
Is there any capacity subs need in an amp to look out for?
tia,
TBerk
You could actually use just about any stereo amp or receiver in the
power range you're interested in. An integrated amp with pre-out /
main in jacks for example. If you're more into higher-end stuff
there's lots of decent separate power amps on eBay. Some are
bridgeable, which might be ideal for you if the woofer impedance is
in the 8 ohm range. That way you're not letting one channel idle,
but that's not a problem for solid-state amps anyway.
Mark Z.
I used to do this with two passive subs so both channels of the stereo
amp. were used. However, the receiver "sub out" crossed over at around
200 Hz - too high! I built an active filter to roll off around 100 Hz
(better) but the 6 dB/octave was not very good. Later I used a
dedicated sub amp. from PartsExpress with a variable cut off at, IIRC,
some 24 dB/octave, 50 to 150 Hz. It now sits at 90 Hz.
Cheers,
Roger
|
I'm likely to go the Parts Express rout myself.
My plan so far is to patch both channels of the Sony Receiver with a
single to dual Y adapter, and then on to both inputs on the Sub.
Either the thing has dual voice coils (likely) or it has two drivers in
the box (possible, but unlikely).
This is the only way I'll get enough current to drive the subwoofer.
According to the manufacturer (Paradigm) it can accept 250 watts but
would like 100-150w normally.
(Thx to a guy named Dave who sent them to me),
The Sony Rec's amp specs are:
| Quote: |
Audio Amplifier Section:
Continuous RMS power output, both channels
driven simultaneously (rated output less than 0.2% THD):
35 + 35 (8 ohms) at 20hz to 20khz
45 + 45 watts (8 ohms)
55 + 55 watts (4 ohms)
Continuous RMS power output, both channels
driven separately at 1khz (each channel):
60 watts (8 ohms)
80 watts (4 ohms)
Dynamic power output (IHF constant power supply method):
100 watts total (8 ohms), 145 watts total (4 ohms)
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The sub runs 4 Ohms, I'm not going to run it at knob setting 11 though. :])
btw- Look for another thread about using full range speakers for the
surround channels.
Guerrilla A/V, Woo Hoo!
TBerk |
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