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Member Since 20 Nov 2011
Offline Last Active Apr 06 2014 11:18 PM

Posts I've Made

In Topic: New Crown X series amps.

06 April 2014 - 11:21 PM

View Postjoust, on 19 February 2014 - 10:15 AM, said:

If you own an iPad, iPhone or iPod, there are a few [audio suite] apps around on iTune. Some of these apps go for a few bucks and some are probably free!
I have an FFT/SPL meter app that works with the internal mic to sample audio to give you real world measurements. It also incorporates an oscillator for testing!

Also, if it's any indication, the XLI3500 (UK only!) weight is around 22kg (49lbs). It is very similar to the X4000, specs wise.


Sorry for the delay in me seeing these recent posts.
The X 4000 is exactly the same amp as the XLI3500. The X series models are distributed through the Guitar Center/Musicians Friend group of companies - The XLI series is sold everywhere else - in the USA also.
The amp weighs 43 lbs so it is quite heavy.
I dont own the amp anymore and didn't own it for very long  - not because I didn't like it but my system grew to the extent where I needed bigger amps so I sold it.
These amps are very under-estimated and have not sold well which is a shame. Good amps, good price - a little heavy but solid .
I believe they are AB amps - definitely not class D.

In Topic: XTI 4002 limiter setting

29 July 2013 - 02:53 PM

Thank you for the response Dakos. However, I am not understanding the formula used here:

The XTI takes dBfs units and not dB or dBu, dBfs units are relative to the amps max power, the maximum power output of the XTI is 650W, that equals 0 dBfs. Your speakers are continuous (RMS) 250W (pgm 500W, peak 1000W), from here it's just a plain dB ratio formula, you get:
10 X Log(P1/P2)=10XLog(250/650)= -4.15 dBfs.

The last part doesn't make sense to me even using the OP amp ratings. I tried the math but cannot get the same result. I need gentle guidance !!!

In Topic: XLI Series bridge mono mode question

27 June 2013 - 02:44 PM

The Crown specs indicate that the XLI series amps are not stable at 2 ohms or 4 ohm bridged.  I own one and called Crown to confirm for myself. 8 ohms is fine.