Output power of Amplifiers and how to get matching speakers

bikingbuddha

bikingbuddha

Well-Known Member
I've been playing around with amplifiers for last year or so and i am new to this. I recently sold both of my receivers which was marantz and yamaha. Now i am left with a tiny little amplifier called "Qinpu Q2" which is a tube hybrid and sounds very pleasant. I also have a two Marantz Towers called LS850 which sounds awesome for their age and i love it's fluffy warm bass. It was previously driven by the Marantz and then Yamaha receivers. Now until i buy an new amplifier, i hooked it up to Qinpu Q2. Surprisingly it plays pretty good, not loud as those big receivers but loud enough at 12 O' clock on the volume pot.

Qinpu Q2 states that output power is 5W X 2 (4 ohms)

Marantz LS850 Speakers says
Max input is 100W
Rated input is 50W
Impedance is 8 Ohms

According to my understanding 5W is tiny but it drives above speakers and i played for more than three hours at a stretch. it only gets slightly warm (amp).

I just want to know if it's alright to drive them with QINPU Q2 or i shouldn't be doing it and get a separate amplifier for this.

I am thinking of buying a brand new amplifier from FX Audio but i am having a hard time understanding which amp to buy. I am looking at this FX Audio amp which can power 2 X 68W speakers. Will that be enough for the Marantz LS850?

https://www.aliexpress.com/item/FX-...lgo_pvid=70290b04-3d6d-4bdc-9b46-c510c021ea54
 
Register to hide this ad
A lot of it depends on two factors--speaker efficiency and listening preferences.

If speakers are highly efficient (rated typically as XXdB 1w/1m--the higher, the more efficient), then they will not require a lot of power to achieve a fair amount of volume (SPL--sound pressure level).

If you typically listen at background or even "moderate" levels, you typically will only be using a couple watts of power (or less) to attain a comfortable volume level. If you like it loud, then you will need a lot more power, because rule of thumb is that it requires 10X the power to achieve a perceived doubling of volume level.

You aren't hurting anything with your current set-up, just don't push the amp beyond its limits into clipping (which can cause damage)--if it starts to sound bad, turn it down. Whether you NEED more power is up to you, depending upon your listening habits/preferences. Lots of folks around here are totally satisfied with a pair of fairly efficient speakers and "flea watt" (2-5 wpc) amps.
 
WaynerN said:
That amp is a "chip" amp. Rated at 68 watts per channel.....They don't say at what impedance. And the real scary thing is that its powered with a wall wart. I think your receivers had way better amps in them then this one.
Click to expand...
I am sure they did because they were bigger with huge transformers inside. Only problem is all of them were giving me issues which i couldn't fix on my own so i sold them off. maybe i should go look for a second hand stereo amplifier. (not a 5.1 receiver). I think a vintage one will do for my requirements.
 
savatage1973 said:
A lot of it depends on two factors--speaker efficiency and listening preferences.

If speakers are highly efficient (rated typically as XXdB 1w/1m--the higher, the more efficient), then they will not require a lot of power to achieve a fair amount of volume (SPL--sound pressure level).

If you typically listen at background or even "moderate" levels, you typically will only be using a couple watts of power (or less) to attain a comfortable volume level. If you like it loud, then you will need a lot more power, because rule of thumb is that it requires 10X the power to achieve a perceived doubling of volume level.

You aren't hurting anything with your current set-up, just don't push the amp beyond its limits into clipping (which can cause damage)--if it starts to sound bad, turn it down. Whether you NEED more power is up to you, depending upon your listening habits/preferences. Lots of folks around here are totally satisfied with a pair of fairly efficient speakers and "flea watt" (2-5 wpc) amps.
Click to expand...

So at the moment i think i will stick with my qinpu q2 until i find a proper amplifier for my lovely marantz towers. thanks a lot for the information.
 
Some translator is putting the FX people on with the "very strong taste of bile" description. :D

A vintage amp is subject to the same deterioration issues as your old receivers (luck of the draw - some vintage does fine for years...)

The Nobsound is an unknown quantity - other stuff of theirs is appreciated by some here. Inexpensive Chi-Fi stuff is kind of hit-or-miss - sometimes the only way to find out for yourself is to buy it and try it. It has more features than yours - Bluetooth, etc. It should play about twice as loud, if they are not exaggerating their power rating more than the Qinpo.

I find some chip amps sound wonderful. I'm not sure of the real underlying architecture of the Qinpo, but if it sounds good and plays loud enough for you, I'd stick with it for now and save up some more money for a replacement, or for something else.
 
WaynerN said:
That amp is a "chip" amp. Rated at 68 watts per channel.....They don't say at what impedance. And the real scary thing is that its powered with a wall wart. I think your receivers had way better amps in them then this one.
Click to expand...
Its NOT a chip amp, its Class-D. Highly efficient, on the order of 80%. So it can easily produce 68w, most likely at 8 Ohms, which is plenty of power. With an 85 dB/W SPL speaker, that's 103 dB, very loud (peaks, I know). With 90 dB sprkrs, like my ads 1290's, that's 108 dB, which qualifies for THX use (min. SPL spec. being 105 dB).
 
triode17 said:
Its NOT a chip amp, its Class-D.
Click to expand...
The term "chip amp" refers to integrated circuits used for audio amplification -- which are almost invariably Class D -- and which the Qinpu Q2 uses for power amplification. The tube is presumably used as a preamplifier assuming it isn't just used for decoration, which is a thing. See https://www.stereo.net.au/forums/to...-chinese-tube-amplifier-nobsound-ms-10d-mkii/

Unless you're referring to the FX502E, but it's also arguably a chip amp, using a TDA7498L integrated amplifier module.
 
DaveVoorhis said:
The term "chip amp" refers to integrated circuits used for audio amplification -- which are almost invariably Class D -- and which the Qinpu Q2 uses for power amplification. The tube is presumably used as a preamplifier assuming it isn't just used for decoration, which is a thing. See https://www.stereo.net.au/forums/to...-chinese-tube-amplifier-nobsound-ms-10d-mkii/

Unless you're referring to the FX502E, but it's also arguably a chip amp, using a TDA7498L integrated amplifier module.
Click to expand...
My point was its not the classic chip amp, like the Toshiba's from the 70's.
 
triode17 said:
Its NOT a chip amp, its Class-D. Highly efficient, on the order of 80%. So it can easily produce 68w, most likely at 8 Ohms, which is plenty of power. With an 85 dB/W SPL speaker, that's 103 dB, very loud (peaks, I know). With 90 dB sprkrs, like my ads 1290's, that's 108 dB, which qualifies for THX use (min. SPL spec. being 105 dB).
Click to expand...
So you think this is a good buy for my speakers?
 
DaveVoorhis said:
The term "chip amp" refers to integrated circuits used for audio amplification -- which are almost invariably Class D -- and which the Qinpu Q2 uses for power amplification. The tube is presumably used as a preamplifier assuming it isn't just used for decoration, which is a thing. See https://www.stereo.net.au/forums/to...-chinese-tube-amplifier-nobsound-ms-10d-mkii/

Unless you're referring to the FX502E, but it's also arguably a chip amp, using a TDA7498L integrated amplifier module.
Click to expand...

Thank you for the post but stupid people like myself easily gets lost in them.

Here is everything i figured out about qinpu q2

http://audiokarma.org/forums/index....all-it-says-does-anyone-know-about-it.836208/

So it is a chip amp with tube buffer.
 
Currently i am powering my speakers using this set up. Half past the volume dial on qinpu q 2 is super too loud to listen to.

Ugreen Bluetooth adapter (Stream AAC) ---- > 6N3 Sainsmart Tube preamp (GE JAN 5654) ----> Qinpu Q2 with (2C51) ----> Marantz LS850.
 
My 98 sensitive speakers run at around 5 to 7.5 watts at "its too loud hon, neighbors gonna kill us" levels.
If I add bass, they want 80w real fast.

You need to be careful - if it sounds "off" in the highs, turn it down if you want to keep your tweeters. Bass is warm and flabby, because there simply isn't enough power to control them.
 
You must log in or register to reply here.
Back
Top Bottom