#Harman kardon 630 receiver specs series

The contour (loudness) control provides an additional 10dB of gain at 50Hz. Tone controls are centered at 50Hz and 10kHz, and provide +/- 12 dB gain or attenuation. Overall, the pre-amp section is not as good as the Marantz, but it correctly relies on the power amp to carry it. The pre-amp continues the very-low NFB philosophy and is a simple and elegant design. This is quite good for a 1970вЂ™s amp indeed. THD is less than 0.1% and is primarily second order. h/kвЂ™s claim for the frequency response (4Hz вЂ“ 130kHz) seems to hold true with test loads. Being a DC amplifier, however, it is more sensitive to varying loads than something like the CC Marantz 2230 or h/k 820. The amplifiers are nominally rated at 40WPC, but using modern measurement methods, I found it was capable of 90 watt dynamic peaks (+3.25 dB), and the amplifier output is fairly stable to 2-ohms. It is a very low NFB design, which does not have as much ultimate gain, but it ensures greater power reserves and lower noise. The power amplifier is a direct coupled (DC) complementary design (h/kвЂ™s first). TheВ Harman/Kardon 730 was also more reliable, using a simpler design and more modern components. Nobody really missed the extra 5 watts, as dynamic power and s/n ratio increased dramatically.

#Harman kardon 630 receiver specs series

The 730 was the second place unit in the second series of Twin Powered x30 receiver with the TOTL unit being the Citation Receiver (not really a x30 receiver, but was still Twin Power). Models numbered 430 or higher used what was to become a semi-legendary design: Twin Power. Power ranged between 10WPC (230) and 45WPC (930). In total, their were 10 different x30 models produced between 19. These were followed by the 630 and 930, and later the 430 and 730. The first вЂњnewвЂќ x30вЂ™s were the h/k 230 and 330. Starting in 1969, the line was reintroduced in solid-state form. The h/k x30 series of receivers actually traces it roots back to the early 1960вЂ™s with h/kвЂ™s вЂњFestivalвЂќ series of tube integrated receivers. h/k followed suit and enforced very stringent terms of quality control on the manufacturing facilities. Marantz routinely performed on-site audits of manufacturing facilities to prevent this sort of thing from happening. Initially, this lead to some quality control issues as certain specifications were lost in translation, and part-substitution ran amok. In the later 1960вЂ™s h/k began designing their products in house and sending the order to Japan or R.O.C. They then used conservative design to build affordable and excellent sounding gear. Unlike other companies at the time, h/k tried to keep costs down by using as much off-the-shelf componentry as possible. Their products were very well built using the best mass production techniques at the time. Harman Kardon was founded in the early 1950вЂ™s to produce affordable, high-quality audio equipment for the average person.