TTemporary 100W Amplifier TDA7498

This is a decent amp. It is a dual-channel BTL configuration, so it can feed a lot of power into 8-ohm speakers unlike many other integrated amps that can achieve the advertised power rating only with 4-ohm speakers.First, there is slightly incorrect advertising going on in the description. This amp is based on the TDA7498 chip, which can deliver 100W+100W into 6-ohm speakers, but this requires a 36V supply. This board's maximum operating voltage is 32V (probably due to the 35V 2200uF capacitor that is used as the main power filter.) According to the TDA7498 data sheet, the maximum power you can get at 32V is 93W per channel. Given that there are many amps out there that claim 4x (or even 10x) more power than what they can actually deliver, a less than 10% overstatement of power is probably not a big deal.Secondly, the maximum power is delivered at 10% THD. That kind of distortion may be OK for a PA system for announcements, etc., but you probably don't want to listen to music at 10% THD. This amp can still deliver about 70W per channel into 6-ohm speakers at around 0.2% THD (at 1KHz), and by 80W per channel, THD is approaching 1%, which is probably maximum distortion one can tolerate for music. Also, like many other Class-D amps, THD levels are higher for higher frequencies, but I couldn't find specific data for this device at high power output. At 1W output, when THD at 1KHz is around 0.05%, THD at 8KHz is nearly six times more at 0.3%.In the likely case you are using this amp with 8-ohm speakers, the maximum power is around 74W per channel with a 32V supply, again with THD around 10%. At a more reasonable THD level of 0.3%, the amp can deliver about 60W per channel, which is typically where you would use this amp for maximum volume for music. (For comparison, many 2x50W amps based on other integrated chips like TDA3116 can only deliver about 2x10W at low distortion into 8-ohm speakers.)As always, power delivered by the amplifier is just one aspect of how volume you can achieve. The efficiency of speakers is also very important. There could be easily be 10dB sound level difference between a low efficiency speakers vs high efficiency speakers at the same input level, which means that you might hear twice the volume with the same power input.As many other reviewers noticed, the frequency response of this amp is not very flat. For low frequencies, there is a minor dip starting around 60Hz, and for high frequencies, there is a rise starting at 2KHz and reaching about +1.5dB at about 15KHz. If your source device does not have some kind of tone control or equalization capability, you may want to purchase an active tone control board (sub $10 item) to compensate.Finally, to get the best results from this amp, you need a decent power supply. The efficiency of this amp is 90% (which is very good), but if you want to be able drive 2x80W without clipping, you need at least 160W / 0.9 = 178W of power input. A reasonable target power supply specification would be 32V @6A. If you are using a 24V supply, the best you can do is 2x60W into 6-ohm speakers, which requires 120W / 0.9 = 133W, so a 24V @6A power supply is recommended. If you are driving only 8-ohm speakers, even a 24V @ 4A supply may be sufficient, since you are not likely to get more than 2x40W power output at low distortion levels.Overall, this is a nice compact integrated amplifier that is capable of driving 8-ohm speakers to reasonable power levels with low distortion. You need to correct for the frequency response by using some form of input equalization, other wise, the output is somewhat bass-poor and treble-heavy.

Bought this for a portable battery powered amplifier. Mounted it in old cooler with 12volt 18 Ah sealed lead acid battery and a $10.00 voltage booster set to 32 volts. Used a set of in-wall mounted speakers mounted in the front of the cooler. Use it primarily with a 4 channel mixing board with builtin reverb effects to play my acoustic/electric guitar when I'm outdoors or in a venue with no electric.I also use it occasionally with a $15.00 bluetooth receiver module plugged into to input to connect my phone or other bluetooth audio source.Sound is perfect for my needs. Very surprised at the great audio quality and volume. Even the bass is great. Uses between 500ma and 1.5amp depending on type of music playing and sound level. This is measured at the battery so it also includes the power booster in the total. I can run this amp and a pure sine wave inverter powering my mixer for more than 5 hours before the inverter starts beeping to signal a low battery. If you don't use a power inverter and use the bluetooth module or other external source that doesn't drain the battery you could probably double the time between recharges.

This can be a nice little amplifier if it is used with the right source. There is no coupling for the input, and this can cause some issues. Most devices with a poorly filtered Class D PWM output (cheap tablets, portable digital audio players, etc) will be especially biased to the higher frequencies giving it a treble-rich sound.When supplied with 32V at 3A, it seems to be immune to noticeable distortion up to around 75 watts (32V, 2.5A). I noticed quite a bit of distortion from bass frequencies clipping the highs at maximum power. It SHOULD fare slightly better against distortion above 80 watts provided that a 32V supply rated at 4A is used. I currently have not tested it above a 32V/3A supply.You might also take care to switch off/disconnect power to the amp when plugging in or switching the source on or off. The input has only a potentiometer precluding the input, which could cause damage to speakers rated under 100 watts during any surges to the input.

their rated distortion (THD + N) is less than 0.01%) seems fluffed up quite a bit . I don't think it is close to that . more like 1.0 or more and as for the rated wattage I don't understand how they can rate it that high but it seems most of todays cheaper electronics use such inflated ratings not to mention they don't disclose the distortion rate at that wattage , making it difficult to compare items or judge how it will perform in your application. unit does work well I would say , but it is not a subwoofer amp as it said in the description , It does not have a frtequency dial or adjustment making it just a full range stereo amp.at least board is marked in english making connecting easy.

Amazing full range amplifier, I bought one at first just to test it out and I was amazed of how powerful these little things are and how amazing they sound playing all range from 30hz all the way up to what you can hear. I own 4 of them now, 1 for highs, 1 for mids, 1 for bass and 1 for subs. I can't recommend this enough. I saw one customer gave it 4 stars because he said the wattage was overrated but he was giving it way less power than it requires, I guess now everybody understand

Decent little amp, slightly over rated(100wx2) more like 30wx2 clean power. Tested at 29.73v @ 2.1amp. Regulated power supply capable of 30v @ 10amp(300watt). Input voltage only thing not tested(laptop), so with higher input it may achieve better results.

I like it

Used this little thing to bypass the transistor power amp on my 1960's record console. Works great and pushes out more volume at a better sound then the original board provided.