qtx | Q240 Power Amplifier | 240W, 172.051UK

Fully agree with with what others have written about the fan noise. It is extreme - there's no way the amp could be used in a studio - or even home music area in my opinion as the fan noise is too loud.I knew this when I purchased it - I had read the reviews. Managed to get the amp for £70 delivered from Amazon and thought I'd install it and assess the unit myself. After first day, I agreed with the assessment of other buyer - the fan was too noisy and distracting for every day use, so I ordered the Noctua NF-A8 ULN.Like another reviewer, I fitted it with the sound reducing resistor. It was an easy job to open the unit and remove the existing fan - it plugs into a two pin socket on the main PCB board. Two wires only - red and black. I both of these wires at their half way point so that I could keep the same two pin PCB connector.To fit the Noctura, I added the low noise resistor cable, felt where the resistor was in the sleeve and snipped the cable AFTER the resistor. You'll find 3 cables inside the sleeve - yellow, black and black cable after the resistor. From the original two pin PCB connector, solder black to black of the Noctura cable; red to the black wire after the resistor; finally, ignore (tape back) the yellow cable. I used heat shrink sleeving over the solder joints to ensure a tidy and safe installation.I ensured the unit was not connected to the power before commencing the work and wore an earthing bracelet just in case there was any residual charge in capacitors.Unsure how QTX think this unit is sellable and fit for purpose with the factory fan installed. Factoring in my low purchase price and £20 for the new silent fin, I have a great amp now that is totally silent. Real crisp sound that sounds good over most frequencies.

Delighted with the amplifier, performance is excellent, much better than the previous amplifier I was using, would highly recommend it.

The day I received it the box was beaten up and I actually heard the parcel being dropped not placed on my doorstep. slightly bent rackmount side. needed the amp so turned it on, within 3 minutes I had it powered off to get the fan size, and ordered a Noctua NF-A8 ULN and fitted it the day it turned up with the uln resistor soldered inline, reduced the volume from too loud to barely audible with more airflow than the standard fan. the fan wouldn't be an issue if its being used to power Pa, but in a studio environment its way too loud. would have gotten 4 stars because the fan was loud, received 3 stars because of the crap way it had been thrown around and dropped by the amazon delivery driver.

Very nice Amp, very loud Fan , so only 4 stars . 2 minutes to invalidate the warranty and fit a Noctua NF-A8 fan, which came supplied with the correct connector for the board, the amp is now almost silent, run for 4 days non-stop, no issues, this is now an excellent amp.

This product was bought to use for church services and is satisfactory for this purpose.