Velodyne SC-1250 specs - AVS Forum
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post #1 of 31 Old 04-17-2008, 02:21 PM - Thread Starter
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it says 1250 Watts RMS, 3000 Watts Dynamic but it doesnt say what it does per channel @ 4 ohms and @ 8 ohms. I doesnt say if it will do 2 Ohms per channel either.

I have one because I bought two velodyne SC-8s and it as a package. I can sell the SC-8s on ebay (maybe?) and keep the amp for my DIY project.

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post #2 of 31 Old 04-17-2008, 04:54 PM
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That spec is the bridged output at 8ohms iirc, so its per channel output would be half that at 4ohms each.
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post #3 of 31 Old 04-18-2008, 02:11 AM - Thread Starter
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Thanks, but I dont read anything about the bridging capabilities and on the back of it there isnt any labels to do bridging, it just has left and right connections.

so far Im assuming its about 625 per channel @ 4 ohms. What equipment is needed to test it?

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post #4 of 31 Old 04-18-2008, 02:55 AM
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You can do the test yourself with water heater elements and a voltmeter but you still need to study the waveform as well, your best bet is to send one to chuch (chasw98) for testing. If he is willing to test the unit, it should answer your questions.
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post #5 of 31 Old 04-18-2008, 07:36 AM
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My understanding is that it is 1250w RMS into 8 ohms. The way it was explained to me is that it is the AMP section they use in the DD18 and the PEQ section they use in the SPL line. The difference is that it is able to handle 2 sets of 8 ohm speakers (2 speaker outputs) that brings it down to 4 ohms. The way they advertize it though, I think it is 1250 w into 8 ohms using 1 of the speaker outputs. They rate it talking about 1250 w RMS and 3000 w peak and talking about the different 8 ohms speakers you can use in the velo line....then later they mention that you can add another 8 ohm velodyne speaker as well. In otherwords, I think it is 1250w RMS into one 8 ohm driver, since that is what the wording sounds like to me, and also what the velodyne DD and SPL speakers are. It just happens to be stable down to 4 ohms, so that would make the output even higher. If you go on the velodyne discussion thread you can ask "curt c." he works for them and always answers questions. Maybe I will go ask and get back to you.
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post #6 of 31 Old 04-18-2008, 07:52 AM
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I would prolly email velodyne to get to the bottom of this.
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post #7 of 31 Old 04-18-2008, 07:58 AM
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Quote:
Originally Posted by armystud0911 View Post

I would prolly email velodyne to get to the bottom of this.


I just sent Curt a PM, he IS velodyne
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post #8 of 31 Old 04-18-2008, 08:17 AM
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this is what the owners manual says:

SC-1250 Subwoofer Amplifier
• Amplifier: 3000 watts dynamic/1250 watts RMS high efficiency, Class D
• DSP-controlled
• 4 selectable presets for customized listening mode
• Automatic 7 band room equalizer (microphone included)
• Night-mode setting
• Mute control
• Adjustable (30 to 160 Hz) low-pass crossover (defeatable)
• Line-level (RCA) inputs and outputs
• Speaker-level inputs with 5 way binding post connections
• Signal sensing auto turn on/off (defeatable)
• Variable volume control
• Selectable phase control (0, 90, 180 or 270 degrees)
• Built-in adjustable digital low-pass crossover with 24 dB/octave slope
• Driver Displacement Control software to prevent over excursion and amp clipping
• Blue power indicator LED
• RS-232 Serial Interface
• 12 Volt trigger
• Universal remote input jack
• Ability to drive up to TWO subwoofers**
** If two subwoofers are driven, they must each have 8 ohm or higher impedence. SC Series
subwoofers can be run in this fashion. If a more traditional 4 ohm subwoofer is driven with the
SC-1250, only one can be driven.
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post #9 of 31 Old 04-18-2008, 09:49 AM
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There is the specs, then there is the real world output....

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post #10 of 31 Old 04-18-2008, 10:22 AM
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Quote:
Originally Posted by jpmst3 View Post

There is the specs, then there is the real world output....


And since the output of the DD18 is so damn impressive, output wise, I would assume the higher number on this amp and not the lower.
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post #11 of 31 Old 04-18-2008, 10:55 AM
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Curt just answered:

"Hi,
1250 into 4 ohms.
Curt"

I guess this is why the 3000w peak is so important? weird.
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post #12 of 31 Old 04-18-2008, 11:28 AM
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The Hi-pass is listed at 80 Hz, 6 db per octave. Does this mean its down 6 db at 40Hz and 12 db at 20Hz?

Thats something to keep in mind if it is indeed the case. What do you do - design your sub with a rising response and cancel it with the amp? you'd be married to that amp for the life of the sub.

Its a neat amp with some cool features, but I would look at it as a single channel amp for the type of drivers used most around here. If you wired for 8 ohms it would work but as Rod just pointed out, the "1250" its rated for is at 4 ohms so there goes your high power.
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post #13 of 31 Old 04-18-2008, 11:59 AM
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Quote:
Originally Posted by Tack View Post

The Hi-pass is listed at 80 Hz, 6 db per octave. Does this mean its down 6 db at 40Hz and 12 db at 20Hz?

Thats something to keep in mind if it is indeed the case. What do you do - design your sub with a rising response and cancel it with the amp? you'd be married to that amp for the life of the sub.

Its a neat amp with some cool features, but I would look at it as a single channel amp for the type of drivers used most around here. If you wired for 8 ohms it would work but as Rod just pointed out, the "1250" its rated for is at 4 ohms so there goes your high power.

I am not sure that the above information sounds right regarding the slope, they are designed for very very small sealed subs, so that doesn't sound right, unless they have crazy TSPs, but I doubt they would design it like that as it is somewhat of a modular system where the amp can be used with any passive or DIY sub above 4 ohms, and the sub can be used with different amps.

I agree, knowing this I need to find a way to get my subs down to 4 ohms to take full advantage of the power.
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post #14 of 31 Old 04-18-2008, 01:32 PM
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Quote:
Originally Posted by rodH View Post

I am not sure that the above information sounds right regarding the slope, they are designed for very very small sealed subs, so that doesn't sound right, unless they have crazy TSPs, but I doubt they would design it like that as it is somewhat of a modular system where the amp can be used with any passive or DIY sub above 4 ohms, and the sub can be used with different amps.

I agree, knowing this I need to find a way to get my subs down to 4 ohms to take full advantage of the power.

They are designed for all the contractors series subs, not just the small ones.http://www.velodyne.com/sc_banner_click.html

I agree the hi-pass doesn't sound right, but thats all I could find. I quit looking when I saw it on the spec sheet from Velodynes PDF.
Maybe another pm to Curt?
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post #15 of 31 Old 04-18-2008, 02:05 PM
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Quote:
Originally Posted by Tack View Post

They are designed for all the contractors series subs, not just the small ones.http://www.velodyne.com/sc_banner_click.html

I agree the hi-pass doesn't sound right, but thats all I could find. I quit looking when I saw it on the spec sheet from Velodynes PDF.
Maybe another pm to Curt?

All of these are in (relatively) small sealed enclosures, I have an SC12 sitting in front of me and it is tiny.
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post #16 of 31 Old 04-18-2008, 02:07 PM
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I get it, sorry. I thought you meant something else.
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post #17 of 31 Old 04-18-2008, 06:24 PM
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here are a couple links to tests. This is an SC1250 and SC10 test, doesn't look like it drops off 6 db/octive:

http://www.avtalk.co.uk/forum/index....&SQ=1178450584

Here is the SPL1500R that uses the same PEQ as the SC1250, except the SC1250 uses the power amp from the DD15/18 unit. Again, not a 6 db drop:

http://www.avtalk.co.uk/forum/index....&SQ=1178450584
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post #18 of 31 Old 04-18-2008, 10:17 PM
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I don't see any drop either. The AVtalk test lists the same hi pass in their test specs. I'm curious to find out what its all about. I originally went looking for that hoping to find an adjustable hi pass.

So do you have two sc 12s and the amp? How do they sound? I think its a great alternative to a single DD.
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post #19 of 31 Old 04-19-2008, 06:25 AM
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Quote:
Originally Posted by rodH View Post

And since the output of the DD18 is so damn impressive, output wise, I would assume the higher number on this amp and not the lower.

Ya, I dunno, certainly possible. I would be inclined to have chuck test one. His tests can reveal some very suprising data.

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post #20 of 31 Old 04-19-2008, 07:22 AM
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the highpass is only relevant if you actually use the "outputs" to speakers on the SC1250 amp (it only affects the mains, not the sub). normally, you let the receiver control the crossovers, so you only use the LFE input and not the highpassed outputs.

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post #21 of 31 Old 04-19-2008, 07:44 AM
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Quote:
Originally Posted by ribbit View Post

the highpass is only relevant if you actually use the "outputs" to speakers on the SC1250 amp (it only affects the mains, not the sub). normally, you let the receiver control the crossovers, so you only use the LFE input and not the highpassed outputs.


Thank you, makes sense. Do you know how they handle the hi- pass for the sub portion? Maybe since they are designed primarily for sealed subs they went without.
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post #22 of 31 Old 04-19-2008, 08:46 AM
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Quote:
Originally Posted by ribbit View Post

the highpass is only relevant if you actually use the "outputs" to speakers on the SC1250 amp (it only affects the mains, not the sub). normally, you let the receiver control the crossovers, so you only use the LFE input and not the highpassed outputs.


Oh, that makes sense. I knew there was a simple explaination.
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post #23 of 31 Old 04-19-2008, 08:53 AM
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Quote:
Originally Posted by Tack View Post

I don't see any drop either. The AVtalk test lists the same hi pass in their test specs. I'm curious to find out what its all about. I originally went looking for that hoping to find an adjustable hi pass.

So do you have two sc 12s and the amp? How do they sound? I think its a great alternative to a single DD.


Actually a single SC driver will give more SPL than a single DD of the same size. I was looking at the DD18 and DD15 and decided to get this amp and either a single DD15 or (2) SC12. I ended up getting 1 sc12 so far, then I found this site and am figuring a DIY project for even bettter sound and less $ (but it isn't easy).
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post #24 of 31 Old 04-19-2008, 01:58 PM - Thread Starter
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I have an SC12 sitting in front of me and it is tiny.

I have two SC8s in front of me, I love the look!! Im thinking of keeping them for my office which just has two bookshelf speakers. Great little sub package that goes down to 30Hz very cleanly.

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post #25 of 31 Old 04-19-2008, 02:33 PM
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Originally Posted by penngray View Post

I have two SC8s in front of me, I love the look!! Im thinking of keeping them for my office which just has two bookshelf speakers. Great little sub package that goes down to 30Hz very cleanly.

Ya, can't believe that guy almost has to give them away on ebay, it seems like nobody wants the 8", I bet they would be GREAT little drivers for someone to integrate into a DIY 3 way speaker, or, as you said, a nice little office, or small room, 2 channel (with these as subs) system.
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post #26 of 31 Old 04-19-2008, 05:01 PM - Thread Starter
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Quote:


Ya, can't believe that guy almost has to give them away on ebay, it seems like nobody wants the 8", I bet they would be GREAT little drivers for someone to integrate into a DIY 3 way speaker, or, as you said, a nice little office, or small room, 2 channel (with these as subs) system.

hehe, I bought them all from a guy on ebay and I gave him a best offer. Sweet deal IMO so far so good too.

I still want to use the amp for my two TC2K subs but I can not get 4 ohms when wiring both of them (they are single voice coil ). I may use the SC1250 just for one of the subs and my QSC 1850HD bridged for the other or move the QSC 1850 into the office to drive the SC8s. Still need another amp!


Also yes I think the SC8s will make a great office 2 channel full range speaker system. I have AV123 .5 refs that are still in boxes, very good mid and upper range speakers and now I think they will sound great with the SC8s.

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post #27 of 31 Old 04-19-2008, 05:22 PM
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Quote:
Originally Posted by penngray View Post

hehe, I bought them all from a guy on ebay and I gave him a best offer. Sweet deal IMO so far so good too.

I still want to use the amp for my two TC2K subs but I can not get 4 ohms when wiring both of them (they are single voice coil ). I may use the SC1250 just for one of the subs and my QSC 1850HD bridged for the other or move the QSC 1850 into the office to drive the SC8s. Still need another amp!


Also yes I think the SC8s will make a great office 2 channel full range speaker system. I have AV123 .5 refs that are still in boxes, very good mid and upper range speakers and now I think they will sound great with the SC8s.

Ya, remember I told you about that guy on ebay?

Trying to figure out as well how I am going to wire a couple 4 ohm DVC TC drivers along with my sc12. I don't think I can make it happen unless I use them in 16 ohm config which sucks, so I might just take the sc12 out of the equation in my main system and use it in a smaller 2 channel system I am trying to maybe put together (pending wifes approval )
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post #28 of 31 Old 04-22-2008, 05:44 PM - Thread Starter
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I can wire my one 4 Ohm TC2K sub to the sc-1250 and get the full 1250 Watts since it really is a mono-block amp that just allows wiring for two speakers.

More or less this amp gives me the same power as my QSC RMX1850 amp bridged @ 4 Ohms...it does 1200 Watts Bridged @ 4 Ohms.

I will use both amps to drive my two subs and we shall see which one is better.

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post #29 of 31 Old 07-04-2012, 05:43 AM
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Hi togehter,

I hope someone get notice of this question, but what is the input sensitivity (input gain) in Volt to get the full power of the SC-1250 ?

best regards,
Jo
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post #30 of 31 Old 07-06-2012, 09:46 AM
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Quote:
Originally Posted by DipolJO View Post

Hi togehter,
I hope someone get notice of this question, but what is the input sensitivity (input gain) in Volt to get the full power of the SC-1250 ?
best regards,
Jo

About ~1V... less if you have its volume set high.

I would think the RMX1850 would win (just), mostly because of active cooling, could be a close tie. QSC being a PA amp it will need more input voltage to get max power.

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