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Matching a QSC Amp to Cabs?

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Matching a QSC Amp to Cabs?

Postby donniedangerous » Tue Oct 25, 2011 8:36 pm

2 channel qsc usa 850 Amp

Stereo Mode(NOT Bridged):
4 ohm - 425 Watt
8 ohm - 270 Watt

(INDIVIDUAL CABINET STATS)I will buy one for each channel though.
Cabinet choice #1
1X10" speaker 8 ohm/250 Watts RMS (500 Peak)

Cabinet choice #2
2X15" speakers 4 ohm/300 Watts RMS (1200 Peak)

Will either one of these work? If so which one would be better to run VOCALS ONLY for a rock band in a medium size practice space?
Thank you.
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Re: Matching a QSC Amp to Cabs?

Postby dmills » Tue Oct 25, 2011 9:03 pm

For VOCALS ONLY, I would instinctively be reaching for the 10 inch unit. The dual 15 will be a bit louder and go rather deeper, but the 10 inch box will likely make for a better vocal box (quite apart from being smaller and lighter).

That said, there is nothing like enough detail there, and depending on the details of the speakers this could go either way.

Regards, Dan.
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Re: Matching a QSC Amp to Cabs?

Postby TSH-Tim » Tue Oct 25, 2011 9:19 pm

Yep keep to a 10" which is also a lot faster than a 15" as well
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Re: Matching a QSC Amp to Cabs?

Postby donniedangerous » Tue Oct 25, 2011 9:21 pm

I don't know what other details are needed. I really don't know anything about electronics, and the more I research this online the more confused I get. I don't care that the cabinet is larger physical. I want the cab that will sound the best not to mention be the loudest to keep up with the other equipment being used.

The bigger cab is a Gemini, the smaller is made by Pyle. I know these are cheapo crap cabs, but its all that my budget will allow for at the time.
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Re: Matching a QSC Amp to Cabs?

Postby dmills » Tue Oct 25, 2011 9:45 pm

Go second hand young man.....

Both of those are the very definition of pony gear, and I would be having a look at what the local serious PA place has in their used stuff collection. How much have you got to spend, there are some good bargains out there if you don't mind a tatty paint job....

I still think the 10 is **probably** a less horrible box, but what does it use for a tweeter?

Regards, Dan.
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Re: Matching a QSC Amp to Cabs?

Postby donniedangerous » Tue Oct 25, 2011 10:07 pm



This is all that I can find on it. They are only 160 dollars for the pair. I can spend $300. I know that I'm not going to find anything good for that budget.



Heavy Duty MDF Construction w/Reinforced Corners
4''x10'' Super Horn Midrange/Tweeter
1'' Titanium Compression Driver Loaded in Horn
10'' Subwoofer 2'' Kapton VC
Woofer Magnet Weight: 75 oz
Compression Tweeter Magnet Weight: 20 oz
Ported Enclosure for Added Bass Response
Heavy Duty Handles for Easy Portability
Dual Speakon & Dual 1/4'' Jacks
Binding Post Terminals
Built In Crossover Network 4KHz
Power Handling: 250 Watts RMS/500 Watts Peak
Frequency Response: 40-20K HZ
Sensitivity (1w/1m): 97 dB
Impedance: 8 Ohms
35mm Speaker Stand Mount
Dimensions: 15.25''W x 20''H x 12.75''D
Weight: 28 lbs
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Re: Matching a QSC Amp to Cabs?

Postby donniedangerous » Tue Oct 25, 2011 10:11 pm

And thank you all for your wonderful help! I really appreciate you and these forums, especially when I don't know anyone that knows anything about this stuff. Thank you.
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Re: Matching a QSC Amp to Cabs?

Postby damoore » Tue Oct 25, 2011 11:57 pm

For a practice space, why do you need two speakers? One better quality speaker might be the best way to go.
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Re: Matching a QSC Amp to Cabs?

Postby donniedangerous » Wed Oct 26, 2011 6:59 pm

Because I don't know anything about bridging. To my understanding if I use channel 1 on the amp I have to use channel 2 as well. The bridging concept alludes me entirely.

So would a 4 ohm single box be better or 8 ohm? If I go single cab somehow, would the smaller the speaker be better or larger the speaker the better?

I don't know, I guess I'll just go with the two 10' pyles for now. Thanks again.
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Re: Matching a QSC Amp to Cabs?

Postby robare99 » Wed Oct 26, 2011 11:18 pm

What models are the cabinets? People here might be familiar with them...
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Re: Matching a QSC Amp to Cabs?

Postby donniedangerous » Mon Oct 31, 2011 5:47 pm

PYLE PPHP1290 800 Watt 12-Inch Two Way Plastic Molded Loudspeaker

PYLE-PRO PADH1079 - 500 Watt 10'' Two-Way Speaker Cabinet

I no longer am looking at the larger 15" dual speaker cab as an option. These two models only.
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