Is it safe to run this amp with this speaker setup?
Posted 14 January 2014 - 08:08 AM
Posted 15 January 2014 - 08:13 AM
Posted 15 January 2014 - 09:58 AM
and these are the biampable tops like what I have, as mentioned they are run full range with one speaker connected to the other then that goes back to the amp so I am guessing this is 4 ohms mode? If so, is the Sonic sub running at 8 or 4 ohms please?
Posted 16 January 2014 - 12:24 AM
Posted 16 January 2014 - 07:46 AM
Posted 16 January 2014 - 09:07 AM
On the issue of running at different ohmages, there should be no issues with the 3600: It has two independant power supplies!
Note: In Parallel mode, the amp could run at 1 ohm, in mono mind you.
Note 2 : For better thermal management, especially at high levels, refurbish the output stages at a regular intervals. It will make the amp run better!
Posted 16 January 2014 - 09:31 AM
Thanks, can you explain the above please as I am not understanding what you mean by "refurbish the output stages at a regular intervals"?
Posted 16 January 2014 - 10:41 AM
Transistors, especially output devices, are clamped down on heatsinks. To transfer the heat adequately, a thin layer of thermal compound is applied on the output device and heatsink before the transistor is clamped down. After time and multiple heat-cooling cycles, the paste looses coherence and becomes dust. Dust transfers very badly heat and the output device suffers from lack of cooling. This is where I come in!
A refurbishment entails the removal of all output devices, removal and cleaning of all surfaces and application of new thermal compound to both the output devices and heatsinks. A thin layer please! Then a reinstallation of the output devices. Then, try to locate and also refurbish drivers, pre-drivers, the bias transistor and thermal sensor, where applicable.
Once the refurb is done, you will need to verify and adjust the bias levels. For Crown amps, look into the owners manual for correct location and adjustment of these bias levels. I usually adjust between 325mV and 350mV. If necessary, the owner manual states that the ODEP can also need adjustments. I use an IR thermometer for thermal measurements.
Using sine @ 1KHz : At 8 ohms, I can run an amplifier output into soft clipping for hours.
At 4 ohms, I can run the amp at clipping and then draw back a notch under clipping. ODEP may click in after some time.
At 2 ohms, I run the amp below clipping, before ODEP clicks in.
I've never tried at 1 ohm Beware of your AC supply! The amp will run as well as it can as long as it gets all the energy from the wall. Don't run an amp under-powered.
I hope this helps!
Posted 16 January 2014 - 10:47 AM