|Class D Switching Power Amplifiers and Power D/A conversion|
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|21st September 2013, 04:44 AM||#31|
Join Date: Sep 2013
|20th November 2013, 02:53 AM||#33|
Join Date: Oct 2003
NAD drank the Apple juice
I was just about to by the 7050. It looks like a great product. I am sad to say, unless you own an Apple product (iphone or ipad) you really can't use this amp. You need one of these devices to configure the wi-fi or adjust the subwoofer output. NAD won't support any sort of android interface. There are probably reasons for this. The obvious one is that not only does one need to drop $999 for this amp but you also need to find spare cash to buy an ipad or iphone. Seems like a mistake to me. I really want this amp but not on those terms.
My hunt for the right FDA continues.
|15th February 2014, 01:02 PM||#35|
Join Date: Oct 2003
Android app now available
NAD finally got around to it and made an android app available. I bought the d7050 and am enjoying it. It needed to break in over the course of a month. It sounded very good out of the box but doing even better now.
As for the app it is identical to the apple version which means not much. I suspect there's more functionality lurking in those chips than we are allowed to see.
|27th May 2014, 07:45 PM||#36|
Join Date: Apr 2012
|28th May 2014, 06:34 AM||#37|
Join Date: Mar 2005
Some of them.
The battery supply which made a big difference in my case they skipped for obvious reasons.
However. The DDX320 is no longer sold. Now they sell a (or better two) USB-FullDigitalAmps which are based on the same technology. I havn't tried the new device myself though.
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|28th May 2014, 12:29 PM||#38|
Join Date: Jun 2003
Location: Hamilton, was Ottawa (Canada)
UD20 and UD80 both use the Savitech SA9023 USB receiver and then pass on I2S (with control I2C on the side) to PWM STA335 20W (UD20) or STA328 80W (UD80)
Anyone know where to find the SA9023 datasheet?
Just about to mod my UD20
UD20 20W STA335
UD80 80W STA328
PS oh ya, check out the un-used features of these kinds of chips (and that's 2007/8)
■ Wide supply voltage range (5 to 24V)
■ 4 Power Output Configurations – 2 channels of ternary PWM (stereo mode)
(2 x 20 W @ 8 Ω, 18 V) – 3 channels - left, right using binary and LFE
using ternary PWM (2.1 mode) (2x10W + 1x20 W @ 2 x 4 Ω, 1 x 8 Ω, 20 V)
– 1 channel PWM output (parallel-mode) (1 x 40 W) – 2 channels of ternary PWM (2 x 20 W) + stereo lineout ternary
■ 2.1 Channels of 24-Bit DDX®
■ >94dB SNR and Dynamic Range
■ Selectable 32 KHz to 192 KHz Input Sample Rates
■ I2C control with Selectable Device Address
■ Digital Gain/Attenuation +48 dB to -80 dB in 0.5 dB steps
■ Soft Volume Update
■ Individual Channel and Master Gain/Attenuation
■ Dual Independent Limiters/Compressors
■ Dynamic Range Compression or Anti-Clipping Modes
– 15 Preset Crossover filters
– 2 Preset Anti-Clipping Modes
– Preset Nighttime Listening Mode
■ Individual Channel and Master Soft and Hard Mute
■ Independent Channel Volume and DSP Bypass
■ Automatic Zero-Detect Mute
■ Automatic Invalid Input Detect Mute
■ 2-Channel I2S Input Data Interface
■ Input and Output Channel Mapping
■ 4 x 28-bit User Programmable Biquads (EQ) per channel
■ Bass/Treble Tone Control
■ DC Blocking Selectable High-Pass Filter
■ Selectable De-emphasis
■ Sub Channel Mix into Left and Right Channels
■ Advanced AM Interference Frequency Switching and Noise Suppression Modes
■ Selectable High or Low Bandwidth Noise Shaping Topologies
■ Variable Max Power Correction for lower fullpower THD
■ Selectable Clock Input Ratio
■ 96 KHz Internal Processing Sample Rate, 24 to 28-bit precision
■ Thermal Overload and Short-circuit Protection embedded
■ Video Application: 576 x fs input mode supporting
■ PSSO-36 Slug Down package.
Noob all-in one digital audio
Last edited by AudioLapDance; 28th May 2014 at 12:38 PM.
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