Instruction: Answer the given question using the supporting document.

Input:
Question: If you plug in headphones in the jack does it cut the rear speaker output?
Document: Decent little T-Amp. But it really has very low output.The Bad:The 25WPC is only into 4OHMs and at full power it has 10% THD.TEN PERCENT. That is bad. You have to run this amp with very efficientspeakers and limit the volume or you will enter the land of distortion.The Good:Nice build quality.compactFront headphone jack. (not very powerful or detailed but it has one. )Able to drive 4OHM speakers.
The sound from the speakers is very pleasing. It doesn't cause listener fatigue like some lower priced amplifiers. However, the sound from the headphone jack has a crackling noise at midlevel volume and above. In an attempt to solve the problem, I reseated input connections multiple times and I have tried several different earbuds and headphones to no avail. In addition, I have plugged and unplugged the headphones several times to help rid the contacts of any slight oxidation.
Truth is I'm not an audiophile. I needed a device to hook up to my LCD TV so I could wear headphones while watching Game of Thrones and jogging on my extremely loud treadmill. I know there are other solutions to this problem including some nifty bluetooth products, but I like foolproof, wired approaches whenever possible. The TV had audio out in a 3.5mm jack, so I connected it to the component-in RCA R/L with a splitter. Powered it up, and plugged in my headphones.
The speaker cable and bananas are nothing special.The stated 25W output is with a 4ohm load with 10% THD. A worthless number. Most people are going to be driving an 8ohm load like the JBL Control 1's I have hooked up in which case it delivers 14W per channel but still with 10% THD which is a grim number. However it will deliver a few watts of clean power to an efficient speaker like the JBL which has a sensitivity of 89db.
The sound is pretty clean but for $70 I expected more power considering there is very little input or output flexibility. Also,  the external power supply really reduces the portability of this product.
I bought this to replace an amp/receiver that was just there to connect the audio out jack of a PC to two in ceiling speakers. This is so much smaller and works perfect for my case.
I cannot say enough about this little gem. Anyone who is on the fence about the Topping, don'tbe. Trust me. Its about as big as the cable box on top of your TV, and the width isa little under the size of a CD.Everything is solid with the make of it. Solid Rca connectors and Binding postinhabit the rear panel.
after 6 months, there's a bit of static when adjusting the volume knob. other than that, it drives my relatively low efficiency (89db) speakers nicely! looks great as well, and drives headphones very well.
Great amp for my headphones. Plenty of volume, and great sound quality on my Studio monitor Beats.Update Dec 27th 2013The amp died.Thankfully Amazon created an RMA.
I decided on this amp after doing some research on class T amps. So far so good. Although not as cheap or popular as other class T amps, this fits the bill for me. The On/Off switch, gain dial, and rear inputs are very good quality. I haven't opened it up but have seen pictures online of the board and caps. Out of the box, I am very pleased with its quality and sound.
Answer: Yes. Good amp, that!