It's due to the screw holding down the transformer. As the transformer heats up/cools, it clicks or pings. Call Emotiva, for instructions. It's a very easy fix. The idea is you loosen the screw that's on the bottom of the amp a tiny bit and it goes away. You don't have to send it in.
Just to be clear, you're talking about a screw *inside* the case, yes ? I already worked with Emotiva tech support (who are top-notch) and they got me to loosen the six screws holdingothe heat sinks to the case from the outside. That got rid of most of the noise. There's only the remaining intermittent ping, which sounds to me more like a heatsink sound than a transformer one.
I think you should probably listen to Emotiva, not me on this. I didn't quite understand what you were talking about. I heard there was one big screw/nut that's on the underside of the case on the outside that holds the big torroidal transformer in place. And a quarter or half turn was enough to stop the clicking. I'm not sure if this pinging you're talking about is different. Either way, definitely follow Emotiva's instructions as I've never done this technique myself.
Transports: Sony BDP 5100 Blu ray player via RCA Coax PC using Musiland Digital Times WASAPI via BNC connection -
Amp: XPA-1 gen 2 using XLR connections. Speakers: Axiom Audio m80 V3, Sennheisser HD600 headphones. two pairs 12 guage speaker cables per monoblock for biwire. Headphone amp: Basx A-100 (INCREDIBLE VALUE WITH HD600s!!)
This is the Aircom T10 which has rear exhaust and digital controls. They make a lot of different versions of this, top exhaust, rear exhaust, front exhaust, with digital controls or without, etc. and many other cooling components as well. Very nice quality stuff.
If it's not shutting down due to heat then you are fine and do not need fans.
I must disagree, at least as far as some receivers and preamp processors are concerned. Marantz and Integra models are notoriously hot. After my DHC-80.3 suffered two failed video processing boards in the first year, I purchased an Aircom 3-fan top exhaust model that arrived the day before the repaired pre/pro was delivered. It has always sat on top open shelf of my rack with no shelf above it. Using the cooler on the lowest setting, it dropped the pre/pro's video board temperature by over 80 degrees when measured with a laser infrared thermometer! The case which would reach temps too warm to keep my hand on for long, now is cold to the touch after six hours of continuous use. The video board, which ran constantly over 190 degrees has reached only 95 degrees (75 degrees ambient air temp) after those same six hours of use. Three years later, the entire unit has remained cool as a cucumber and absolutelytrouble free, even with ambient temps above 85 degrees which has the video processor board hitting 120 degrees. Without the cooler, the pre/pro heats back up to the previously high temperatures. As far as amps are concerned, you're absolutely correct that heat isn't as serious a problem as most amp's protection circuitry will kick in long before any damage occurs. Yet for some reason, pre/pro manufacturers don't seem to be all that concerned about keeping the operating temperatures of the video processing sections as cool as they could. And video processors, especially those handling HD and 4K UHD need all the cooling they can get. The video processing chipsets handling higher resolutions will get stinking hot and commit slow or rapid thermal suicide if they're not kept as cool as possible. It's why even basic 4K video display cards usually have heat sinks and fans on them. Even when doing zero 3D rendering, the processor and RAM chips on the card, when tasked with HD and 4K UHD content get seriously hot. Adding HDR video processing only increases the demand on the chipsets. It's why video cards for gamers have multiple high-speed fans and tons of heatsinking to keep them from frying. The video processors in AV gear, while not being called upon to process high frame rates and 3D rendering, are still called upon to process and/or oversee the display of 4000 12-bit pixels, each capable of changing sixty times per second. That a ton of data and in the digital video processing world, the more speed needed, the more heat generated. As an aside. I have a Behringer iNUKE6000DSP pwm 2000 watt RMS x2 pro amp that drives a pair of beastly subwoofers at 1000 watts each. The tiny, factory installed 40mm fans sounded like an earsplittingly LOUD jet turbine when they kicked in. Solution? I had a local metal shop duplicate the amp's top panel with what's essentially the center cut out. I bought an Aircom S9 three-fan cooler to set on top of it and set to low to medium (summer) fan speeds the amps absurdly small and loud fans never even kick on. All that ridiculous power and now blessedly silent for under $500 delivered. It's easily the quietest, most elegant cooling solution I've seen used for putting a high power, fan cooled pro amp to use for subwoofer duty.
The AC Infinity Aircom T8 with its digital readout has an adjustable thermostat you can adjust to control the fans. I have mine so the fan kicks on at 88 degrees, on cool days it is always running at 87 degrees and the fan is OFF, on normal warm California days it usually it is at either 87 or 88 degrees fans kicking ON & OFF and on very hot days it occasionally may briefly see 89 degrees before it's quickly cooled again to 87 degrees, it's very consistent and you can see what is happening from the digital display.
My Aircom T8 sits atop my XMC-1. The fans are very quiet and the build quality of the AC Infinity Aircom T8 is excellent it has a very nice aluminum front panel and looks great.
- Klipsch Speakers - RF-5 fronts - RC-7 center - RS-7 side surrounds - RS-7 rear surrounds - RT-10d and Velodyne Digital Drive PLUS 10 subs - Emotiva XMC-1 processor - Emotiva XSP-1 preamp - Emotiva XPA-5 & XPA-2 amps - MHDT Balanced Stockholm NOS Tube DAC - Panasonic TH-50PH9UK Professional plasma display - Oppo UDP-203 - HTPC 4-tuner DVR, Digital Music Server - 2 Pure AV PF60 power conditioners - 2 URC MX-990 remotes & MRF 350 RF bases