Ian Coughlin wrote on Fri, 20 August 2010 12:45 |
Recently I've been debating my SRX715's. In my research I have noticed that there aren't any amps in the same range (iTech, PL3's, etc.) that would meet the power requirements for the HF and LF selection of any speaker. Example I have SRX715's, I would need an iTech 6000 for the LF and a XTi1000 for the HF selection. I don't know if its because I'm anal and like matching amps or the increased functionality of and iTech over an XTi. It bothers me that I can't have an iTech power my HF (I know I can get an IT4000 and limit the RMS but that wouldn't be a rational decision). Why don't any of these companies make a lower powered amp in their "flagship" series amp lines? |
Tim Brackett wrote on Fri, 20 August 2010 16:51 |
I bi-amp my VRX boxes, 2/side, with an XTi1000 for the highs and an iT6000 for the lows. I just took the gain difference in account an made it up in the bandpass gain of the crossover. It is just not worth 3 times the cost and several more pounds to me to have the amps match. The XTi does great on the highs and is the last amp in my rig I have to watch when pushing the system. |
Tom Reid wrote on Fri, 20 August 2010 12:09 |
I bi-amp with XTIs. It get's a little tricky, even with internal DSPs as the XTIs all have a different gain. |
Silas Pradetto wrote on Sun, 22 August 2010 06:03 | ||
What everyone is forgetting is that different DSP amps have different latencies that need to be compensated for in the phase alignment of the crossover. I don't think the XTi latency is published but the Itech is. In comparison to the feature set of an Itech, the XTis appear to be a heap of garbage, and usually sound like it too... And if you use a DSP amp with an external DSP then you're missing the point. With possibly the exception of using the AES digital inputs on the Itechs to avoid the extra AD/DA conversion. |
Tom Reid wrote on Sun, 22 August 2010 11:55 | ||||
Johnny scrimped and saved for 2 years to buy his first XTI. He's been longing for an ITECH but just can't get the cash together. He's so proud of his first purchase that he made a new account on PSW to talk with real people about his amp. Then he saw Silas post telling him that his new purchase is garbage. Four years back in therapy for Johnny. When one has a point they're trying to get across, they sound more intelligent if they don't bash things. |
Ian Coughlin wrote on Mon, 23 August 2010 16:13 |
Silas, So you daisy chain all your iTechs... what do you use for feedback elimination/control? |
E. Lee Dickinson wrote on Mon, 23 August 2010 17:19 | ||
Not to answer for Silas, but I use my FOH EQ (in the board, in my case) for feedback control. Doing that in the system processors would seem like kindof a PITA. |
Ian Coughlin wrote on Fri, 20 August 2010 13:45 |
I know I can get an IT4000 and limit the RMS but that wouldn't be a rational decision |
Bennett Prescott wrote on Tue, 24 August 2010 20:12 |
P.P.S. For instance, here is a screenshot of the impedance curve for a 1" exit, 1.7" voice coil HF driver rated for 60W AES that I work with a lot. That driver is powered by an amplifier capable of delivering 330w to it. Up at the top of its response that amplifier would be clipping its rails pretty hard trying to deliver even half that. |
Craig Smith wrote on Wed, 25 August 2010 00:09 |
Am I crazy to want an amp with 2 differently-sized channels? I would like a single amp devoted to a single speaker so I can put it near the speaker and avoid long cables. |
Bennett Prescott wrote on Tue, 24 August 2010 21:41 |
The speaker is rated for 60W long term. Consider 12dB crest factor, which is hardly uncommon in live music. That 60W RMS has peaks of nearly 500 "watts". To reproduce this signal that the driver can handle thermally, you need an amplifier at least that big. This is all confused because amplifiers actually supply voltage. How many watts of power that creates depends on the load. |
Bennett Prescott wrote on Tue, 24 August 2010 21:24[url |
http://www.crownaudio.com/pdf/legacy/134168.pdf[/url] |
Craig Smith wrote on Wed, 25 August 2010 10:47 |
OK, got it, thanks! But aren't amps also rated at RMS? |
Daniel Postilnik wrote on Mon, 07 February 2011 11:55 |
Does the Crown XLS drivecore series dsp include limiting of watts? So far I've only seen that it can limit based on the input level, like "-2db" or whatever it may be. Is this the same thing? |