Members bm1977 Posted June 23, 2009 Members Share Posted June 23, 2009 Hello, Thinking of buying a pair of JBL JRX 112M or Yamaha SM 12V Clubs and running them with a QSC GX5 amp. Also, would any of you recommend a Behringer powered monitor? The Prx monitors are out of the question, too expensive. Thanks for the help. Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 23, 2009 Members Share Posted June 23, 2009 The GX-3 would be a better choice for either of those cabinets. The GX-5 is just too big. I prefer the Yamaha, but the JRX is ok if your expecations aren't too high. Link to comment Share on other sites More sharing options...
Members fireax Posted June 23, 2009 Members Share Posted June 23, 2009 I have two SM 12V's, and six SM 15IV'sI really like them. Link to comment Share on other sites More sharing options...
Members bm1977 Posted June 23, 2009 Author Members Share Posted June 23, 2009 Thanks for the info. I read somewhere that the power amps have to be at least twice the program handling of the speaker. If the Yamaha's program is 350 watts, wouldn't the GX3 be cutting it short at 300 watts at 8 ohms? Just curious. Thanks. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted June 23, 2009 CMS Author Share Posted June 23, 2009 Thanks for the info. I read somewhere that the power amps have to be at least twice the program handling of the speaker. If the Yamaha's program is 350 watts, wouldn't the GX3 be cutting it short at 300 watts at 8 ohms? Just curious.Thanks. NO!!! Power handling is often published in three ways: RMS or "continuous" power. Program power. Peak. All three actually roughly represent the same thing, and the relationship is also roughly: rms x 2 = program. program x 2 = peak. Thus rms x4 = peak. So a 75w rms speaker is also a 150w program speaker or a 300w peak speaker. While you will often read recommendations for using double the RMS power (NOT double the program power!) this is only safe if the conditions of use are well understood, certain precautions are taken, and the risk of replacing blown drivers is acceptable. If you can't afford the PRX, you probably also can't easily afford to replace whatever you buy if you damage it. The safest route for a beginner is to use the RMS rating (1/2 of program if RMS isn't given, as with Yamaha). Note that doubling power does NOT double sound output....you need about 10 times the power to double apparent volume. So adding power only benefits the sales guy's commission, which is why they will pound you with warnings about "overpowering" (which is utter bull{censored}) your speakers and how bad that is. You'll be fine using the GX3 with the SM12V. Don't try to drive the snot out of them. Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 23, 2009 Members Share Posted June 23, 2009 I wish manufacturers would quit the marketing BS, it suits nobody's best interest but themselves. Link to comment Share on other sites More sharing options...
Members bm1977 Posted June 23, 2009 Author Members Share Posted June 23, 2009 AHHHH. This makes a lot of sense, thank you very much. Putting the power issue aside, Which sounds better? JRX of the Club, and serves better as a monitor? Link to comment Share on other sites More sharing options...
Members Coaster Posted June 23, 2009 Members Share Posted June 23, 2009 club Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted June 23, 2009 CMS Author Share Posted June 23, 2009 I'd go with the Club. Not a fan of JRX at all. Link to comment Share on other sites More sharing options...
Members B Money Posted June 23, 2009 Members Share Posted June 23, 2009 BTW: I have a QSC GX3 amp and it's been great. A nice, no frills lightweight amp. I've been using mine to power a pair of 200w wedges and it works great Link to comment Share on other sites More sharing options...
Members ckcondon Posted June 23, 2009 Members Share Posted June 23, 2009 We use 2 of the Yamaha wedges with a GX-3 for monitors and it's a great combo. JBL makes some great cabinets, but not the JRX line. Link to comment Share on other sites More sharing options...
Members fireax Posted June 23, 2009 Members Share Posted June 23, 2009 We love our Clubs. Here are some pics of our monitor set-up. You can make out the monitor amps to the left of the bass player. Link to comment Share on other sites More sharing options...
Members gn2882 Posted June 23, 2009 Members Share Posted June 23, 2009 NO!!!Power handling is often published in three ways:RMS or "continuous" power.Program power.Peak.All three actually roughly represent the same thing, and the relationship is also roughly: rms x 2 = program. program x 2 = peak. Thus rms x4 = peak. So a 75w rms speaker is also a 150w program speaker or a 300w peak speaker.While you will often read recommendations for using double the RMS power (NOT double the program power!) this is only safe if the conditions of use are well understood, certain precautions are taken, and the risk of replacing blown drivers is acceptable. If you can't afford the PRX, you probably also can't easily afford to replace whatever you buy if you damage it.The safest route for a beginner is to use the RMS rating (1/2 of program if RMS isn't given, as with Yamaha). Note that doubling power does NOT double sound output....you need about 10 times the power to double apparent volume. So adding power only benefits the sales guy's commission, which is why they will pound you with warnings about "overpowering" (which is utter bull{censored}) your speakers and how bad that is.You'll be fine using the GX3 with the SM12V. Don't try to drive the snot out of them. On behalf of all us new guys, thanks for such a clear, concise explanation of cab and power output compatibility. Link to comment Share on other sites More sharing options...
Members Dark Ice Posted June 23, 2009 Members Share Posted June 23, 2009 We've got a set of clubs and I like 'em Powering them with a PV900. Steve. Link to comment Share on other sites More sharing options...
Members guitarharv52 Posted June 24, 2009 Members Share Posted June 24, 2009 Clubs get my vote also.We use them Link to comment Share on other sites More sharing options...
Members Unalaska Posted June 24, 2009 Members Share Posted June 24, 2009 Better than clubs are the Yamaha CM115V series, these are for install and use a lineX type finish, full face grill and all the same guts as the SM115V. All the club series models can be had this way. Link to comment Share on other sites More sharing options...
Members ckcondon Posted June 24, 2009 Members Share Posted June 24, 2009 Better than clubs are the Yamaha CM115V series, these are for install and use a lineX type finish, full face grill and all the same guts as the SM115V. All the club series models can be had this way. :thu:That's the model we have. Perfect for floor monitors where drinks and feet seem to find them! Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted June 24, 2009 CMS Author Share Posted June 24, 2009 On behalf of all us new guys, thanks for such a clear, concise explanation of cab and power output compatibility. Glad if I've given useful help. I've been harping on this for years here, so I've got the response down to an art. Though I don't think we can even make a dent in the Underpowering marketing juggernaut. "Even if one person is saved it's worth it":lol: Link to comment Share on other sites More sharing options...
Members bm1977 Posted June 24, 2009 Author Members Share Posted June 24, 2009 Thanks for all the great input. I think I'll go get some clubs. Another question if you do not mind. My friend has 2 JRX's. With his 2 JRX's and my 2 clubs that I will get. WOuld the GX3 still work. I know the QSC website recommends the GX5 for the JRX's Or is this pure caca? Also, can you run 1 moninor or 3 monitors with any GX amp at a time? Thanks again. Link to comment Share on other sites More sharing options...
Members witesol Posted June 24, 2009 Members Share Posted June 24, 2009 1 or 2 monitors per side on a GX amp only. The JRX can be a bit frustrating to parallel with only one speakon jack. i'd suggest putting jbls on one side of the amp, the yamahas on the other. hopefully you have an eq for them. I find the GX3 pretty wimpy myself, but for average situations and limited experience operators it's probably a safer choice. Link to comment Share on other sites More sharing options...
Members Gadget Posted June 24, 2009 Members Share Posted June 24, 2009 Clubs. I purchased four of the JRX over the Clubs w/o test driving them. I thought they were somewhat comparable and the tipping point was my misreading the specs. I thought it said the cabinet had two throw angles. It did, if you use them on poles there are two different angled pole mounts, not for when you are using them as monitors. When I received them, I realized I finally had an answer to the question I sometimes ask my son when he is trying to snow me, "Am I as dumb as I look?" Link to comment Share on other sites More sharing options...
Members witesol Posted June 24, 2009 Members Share Posted June 24, 2009 I've got 11 of the club monitors..so yea, I guess I like them Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 24, 2009 Members Share Posted June 24, 2009 My friend has 2 JRX's. With his 2 JRX's and my 2 clubs that I will get. WOuld the GX3 still work. I know the QSC website recommends the GX5 for the JRX's Or is this pure caca?Also, can you run 1 moninor or 3 monitors with any GX amp at a time?Thanks again. I strongly disagree with QSC's recommendations for the average user, but it does help them sell larger amps and make more money... YOu can run 2 boxes per channel maximum. 1 or 2 per channel is ok. Link to comment Share on other sites More sharing options...
Members bm1977 Posted June 24, 2009 Author Members Share Posted June 24, 2009 What I meant with 1 to 3 monitors is: 1. Run 1 monitor from channel A, for example, and that's it. or 2. Run 3 monitors: 2 from Channel A and 1 from Channel B. Is there a load mismatch? Would the GX handle this. Another question, for what applications would you need the GX5. I guess point is if I upgrade to other monitors that require more power, will I be short with the GX3. Thanks again. Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 24, 2009 Members Share Posted June 24, 2009 Yes, any combination of 1 and 2 monitors is just fine. Upgrade to the GX-5 when you buy better speakers that handle more power. Note...not all better speakers handle more power. There's a lot more to better than just power handling. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.