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Ajsski99 View Drop Down
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    Posted: 07 October 2019 at 8:18pm
Hi all noob questions incoming...

Recently picked up a pair of Phonic SE715 Passive speakers to use at parties and what not.

however im a total noob and have no idea what amp or what sort of cables i will need to connect them together, to the amp and then into my Pioneer DDJ-400 mixer.

any help would be greatly appreciated, even if someone were to just walk me through it all.

thanks, Ajsski99
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Points: 1306 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djgorey Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2019 at 6:01am
In terms of cables, that will depend on what amp you get and what connections it has on the back. 

Your speakers are rated at 200w and 8 ohm so an amp that delivers 200w per channel at 8 ohm would be good. You can get an amp that’s smaller, but you risk driving it too hard to try to get volume out of it and that will risk your amp and speakers. 

There are lots of amps out there, second-hand and new, that will do this job. Once you have one you’ll know what the input and speaker connections are. 
Gaffa tape is like the force in Star Wars - there's a dark side and a light side and it holds the universe together
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imageoven View Drop Down
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Asssuming you don't have lots of money to throw at this you can get better deals going 2nd hand. Something like these would do the job nicely without spending big money. Make sure you are comparing power ratings at 8 ohm (power ratings at 4ohm are usually about double).

The Peavey has a built in crossover which could be usefull if you think you might want a bigger system in the future.

Avoid skytec and similar amps with big numbers and lots of lights - there is lots of overated cheap stuff out there.
Keep pushing on, things are gonna get better.
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Ajsski99 View Drop Down
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my speakers say 250w RMS on the back, surely if my amp delivers more than 250w per channel the speakers will just blow up?
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Ajsski99 View Drop Down
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Originally posted by imageoven imageoven wrote:

https://www.ebay.co.uk/itm/Peavey-PV-900-Power-Amplifier-USED/323940066183?hash=item4b6c552387:g:NVAAAOSwtVhdmnrQ - https://www.ebay.co.uk/itm/Peavey-PV-900-Power-Amplifier-USED/323940066183?hash=item4b6c552387:g:NVAAAOSwtVhdmnrQ

https://www.ebay.co.uk/itm/Cloud-CV1000-Amplifier/293258806197?hash=item44479643b5:g:f7sAAOSwjeldgnco - https://www.ebay.co.uk/itm/Cloud-CV1000-Amplifier/293258806197?hash=item44479643b5:g:f7sAAOSwjeldgnco

Asssuming you don't have lots of money to throw at this you can get better deals going 2nd hand. Something like these would do the job nicely without spending big money. Make sure you are comparing power ratings at 8 ohm (power ratings at 4ohm are usually about double).

The Peavey has a built in crossover which could be usefull if you think you might want a bigger system in the future.

Avoid skytec and similar amps with big numbers and lots of lights - there is lots of overated cheap stuff out there.

my speakers say 250w RMS on the back, surely if my amp delivers more than 250w per channel the speakers will just blow up?
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Earplug View Drop Down
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That´s not really the way it works.

To simplify a bit, speakers are rated for a certain (average) wattage for a certain time. They are usually tested with a wide range (white or pink noise), dynamic, (ie changing) signal - with a specified Crest Factor - over a specified time. If they survive without heat, or mechanical damage, then that´s it. 

Then you have peak or "music power" ratings, which are usually double - or quadruple that. So, when you play your music through them, they usually can handle up to 2 x RMS wattage for a short period of time. The problem is that the amplifier needs to be able to deliver that signal without distortion, so you really want an amp with 1.5 to 2 x the RMS wattage - but control the peaks so the amp does not clip.

Simple, no...   Smile
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imageoven View Drop Down
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From that ebay link;
"Peavey PV 900 2 x 450W Power Amp

 PV 900 output power (1 kHz, 0.1% THD) per channel stereo: 180 watts RMS @ 8 ohms, 300 watts RMS @ 4 ohms. Output power (1 kHz, 0.1% THD) bridged mono: 600 watts RMS @ 8 ohms."

See how the "2 x450W" amp suddenly becomes a 2 x 180W amp when you look a bit closer.
Keep pushing on, things are gonna get better.
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Ajsski99 View Drop Down
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so ideally id want an amp thats 2x 250w?
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JonB67 View Drop Down
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Originally posted by Earplug Earplug wrote:

You really want an amp with 1.5 to 2 x the RMS wattage 


This is the bit you missed.  The reason is also in there.  

The old peavey amps are probably a good choice. 


Edited by JonB67 - 08 October 2019 at 8:54pm
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Ajsski99 View Drop Down
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so all in all 

https://www.ebay.co.uk/itm/Peavey-PV-900-Power-Amplifier-USED/323940066183?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3De6df76507ad24819a5f1cb69140dc9f2%26pid%3D100033%26rk%3D4%26rkt%3D8%26sd%3D123897292590%26itm%3D323940066183%26pmt%3D0%26noa%3D1%26pg%3D2045573&_trksid=p2045573.c100033.m2042 - https://www.ebay.co.uk/itm/Peavey-PV-900-Power-Amplifier-USED/323940066183?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3De6df76507ad24819a5f1cb69140dc9f2%26pid%3D100033%26rk%3D4%26rkt%3D8%26sd%3D123897292590%26itm%3D323940066183%26pmt%3D0%26noa%3D1%26pg%3D2045573&_trksid=p2045573.c100033.m2042 

this amp would be a good choice? would it roughly output 300w per speaker and that would be a safe operating level for them as i have two?
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JonB67 View Drop Down
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Yup. Great choice for its price 

The output spec is its max, and unless you're planning to turn all the dials to 11 and just ignore it if it sounds like it's tearing itself apart you'll be fine even if it was more

As an example I run 300w speakers on a matrix 6004, which had 1200watts per channel with zero issues


Edited by JonB67 - 08 October 2019 at 9:52pm
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Ajsski99 View Drop Down
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Okay great, so all i have to do is adjust the dials to ensure theres no clipping?

Thanks for all your help by the way sorry to be a pain xD
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