Solid State amplifier specifications...

[SEKLEM]

This is for a Niles SI-275 system integration amplifier. I've asked about this amplifier before, to try to gauge interest of the collective here. On paper it seems superior to the B&K 125.2 in many ways, which I also own. The Niles runs cool to the touch, never even warm. The B&K gets very warm to hot.


Design Principle

linear voltage/current amplification.

Continuous Average Power Output

75 watts per channel RMS at 8 ohms, both channels driven

120 watts per channel RMS at 4 ohms, both channels driven

Input Impedance

Approximately 15K ohms

Input Sensitivity

.920V for 8 ohm rated power

.810V for 4 ohm rated power

Overall Voltage Gain

28.5 db

Frequency Response

bandwidth from 10 hz to 70 khz (-1 db)

Signal to Noise Ratio

> 115 db, A-weighted

Total Harmonic Distortion

8 ohms

.02% thd from 20 hz to 10 khz @ full rated power

4 ohms

.02% thd from 20 hz to 10 khz @ full rated power

 

[amirm]

There is not enough info on the Niles to know how it is designed. It could be using a switching power supply to keep efficiency high, and or a class-d amp.

 

[SEKLEM]

There is not enough info on the Niles to know how it is designed. It could be using a switching power supply to keep efficiency high, and or a class-d amp.

It’s class a/b, linear supply. I know that doesn’t give you much more information.

Niles does have a new line of class D amplifiers, which I’m curious about. I’ve read they are a bit noisy, which is disappointing, and not indicative of a carefully integrated product. Considering it’s intended function it’s not surprising, but as with most custom installation equipment, new prices are quite high when one considers performance.