headphone amplifier

Muse 6N11 Class A Tube Hybrid Headphone Amplifier

Muse 6N11 Class A Tube Hybrid Headphone Amplifier

From the time I was a kid I was fascinated with vacuum tubes. Maybe it was the filament glow coming from the otherwise darkened cabinet, or the precision of having to set the pins in just the right direction. Whatever the case may be, I could not help to have a passing thought of Thomas Edison going thru hundreds of different filament materials before finding one that actually worked. Move ahead to FDR’s fireside chats and the tens of millions of Americans who found hope in the warmly conveyed words of the President thru a tabletop radio-vacuum tubes and their yellowish glow unquestionably bespeaks “Americana.”

Specifications:

Frequency response: 10Hz-60KHz +/- 0.25dB
Signal/Noise Ra@o: >91dB
Dynamic range: 84.6dBA(300 ohm) 89.8dBA(33 ohm)
THD: 0.016%(300 ohm) 0.45%(33 ohm)
IMD + Noise: 0.045(300 ohm) 0.42(33ohm)
Dimensions: 79mm (D) X 79mm (W) X 44mm (H) // 3.1” x 3.1” x 1.75”
Shipping Weight: 0.55 kg // 1.2 lbs. read more…

Firestone Audio Fireye Mini: A Mini-Review of a Mini Headphone Amplifier

Firestone Audio Fireye Mini: A Mini-Review of a Mini Headphone Amplifier

Portable music players and smart phones have allowed us carry our favorite digital music files on the go. For example, I love my iPhone loaded with all my favorite Apple lossless audio files. It is easy, convenient, and takes up far less room than my old Walkman with tapes. However, being the pursuer of high-fidelity audio reproduction that I am, I knew that I wanted a little more out of my on-the-go sound quality. There are a few “audiophile grade” digital players on the market that can playback FLAC files, have custom internal DACs, as well as higher driving voltages than your average player or phone. These devices however tend to be expensive, as well as you still have to carry around your phone and your music player; not convenient. But improving the sound quality of an iPhone or digital music player could be as easy as a battery powered, in-line headphone amplifier. Having many choices available to the consumer on the market, I wondered where to begin until an email showed up in my inbox from Firestone Audio of Taiwan with their newest offering.

Specifications:

Amplifier: Class-A / B amplifier Power: Built in battery power supply Headphone Impedence : 32 ohm to 600 ohm
Usage Time : With 100% full battery arround 24hrs, depending on volume.
Charging Method : Using PC or USB adapter to charge
dB-Weighed Frequency response (40Hz to 15kHz): 40Hz +0.1dB, 15kHz -1.67dB Noise level (1kHz, A-Weighted) : -110.5dB
THD% : 0.0068%
Stereo crosstalk : -96.0dB
Dimensions : 40 x 24 x 9 mm (D x W x H).
Weight : 14 gram (without cables)

read more…

Topping TP30 & Topping TP31 Headphone DAC Amplifiers

Topping TP30 & Topping TP31 Headphone DAC Amplifiers

For many audio hobbyists the biggest kick comes not from being able to buy something very expensive, (though I do hope to experience this someday) but rather from discovering a really good value. With my enthusiasm growing for headgear the opportunity to find such bargains is turning into a quest. One of the first products in the category is the Topping TP31 and it’s sibling, the TP30. The difference between the two is that the TP30 has a USB input, while the TP31 is Coaxial.

Specifications:
Inputs: Coaxial, RCA Line in L/R
Outputs: Line out RCA L/R, Headphone
Jack, Speakers L/R
Amplifier: Class-T Tripath TA 2024 BTL

Configuration
Output Power 2 x 15W @ 4ohm, 2 x
10W @ 8ohm
Signal-to-Noise Ratio (SNR) 98dB
Dynamic Range 98dB
IHF-IM Distortion 0.1% @ 1W, 4ohm
THD Distortion:
0.03% @ 9W, 4ohm
0.1% @ 11W 4ohm
0.1% @ 6W 8ohm
10% @ 15W 4ohm
10% @ 10W 8ohm
Power Efficiency: 81% @ 15W, 4ohm, 90% @ 10W, 8ohm
Input Sensitivity: 200mV
Power socket:
TP-30 DAC: TP30 uses the 2704 with 16 bit 48khz
TP-31 DAC: Built-in high-fidelity coaxial DAC (PCM1793) – support for 32kHz-192kHz 16-24bit PCM format digital coaxial signal
Headphone Output: 3.5mm 16-200 ohm
Face plate: 8mm thick CNC machined aluminum
Connectors: High quality Gold Plated RCA
Size: 4 inches wide x 8 inches deep x 1 ¾ inches high
Weight: Main unit only 720g

read more…

Audioengine D1 USB DAC

Audioengine D1 USB DAC

How quickly do things change? Just a couple of years ago a headphone enthusiast could count the number of headphone DACs in a handful of seconds. Now, in the early months of 2012 the list is significantly larger and growing with each passing day.

Specifications:

DAC type: Dual Mode USB and Optical (SPDIF)
Inputs: USB/Optical (SPDIF)
Outputs: RCA stereo/3.5mm headphone
D/A converter: AKM4396
Optical receiver: CS8416
USB controller: TI1020B
USB: Type 1.1 or above
Full-scale output: 2.0V RMS (RCA and Headphone)
Output impedance: 47 ohms RCA, 10 ohms headphone
Power source: USB 5V
Power requirements: 200mA
USB power filtering: 2-stage redundant regulation
SNR: >110db
THD+N: <0.002%
Crosstalk: <-85db
Frequency response: 10Hz – 25KHz +/- 0.5db
Input bit depth: up to 24 bits
Input data rate: up to 192kpbs (optical), 96kpbs (USB)
Product dimensions: 3.5” x 4” x 1″ Shipping weight: 1.0lbs (0.5kg)

read more…

Trends Audio PA-10 Hybrid Tube Headphone Amplifier

Trends Audio PA-10 Hybrid Tube Headphone Amplifier

Specifications:

  • Vacuum Tube: 6DJ8/6922 series or 12AU7 series (exchangeable) Output Stage: MOSFET x 2
  • Amplification Gain: x3 (for Audio CD/DAC IN) x20 (for Audio PC/iPod IN) Signal-to-Noise Ratio: (SNR) 92dB
  • Power Output: 3.0 Watts per channel on 33 Ohm Headphone
  • Frequency response: 15 Hz -100 kHz -1db
  • Input Impedance: 100k Ohms
  • THD+Noise: 0.05% @ 10k ohm0.15% @ 33 ohm
  • Input: CD/DAC IN RCA (Left/Right) x 1 [3Vpp max.] PC/iPod IN RCA (Left/Right) x 1 [0.55Vpp max.]
  • Output Audio OUT RCA (Left/Right) x 1
  • Headphone OUT (3.5mm) x 1
  • Power Socket: (5.5mm/2.1mm) x 1
  • Power Supply: DC 24V-26.5V (max.) Dimensions: (W) 3” x (H) 1.70” x (D) 4.50” Weight: 13.4 oz
  • Price: $225

Having had a positive experience with the Trends Audio TA 10.1 amplifier, I was anxious to review the Trends Audio PA-10 Tube headphone amplifier when the opportunity presented itself. With a limited budget, building a respectable headphone system is the most economical way to enter the world of true high fidelity. Just add a Zune, an iPod, or a CD player, some quality headphones and you can assemble a nice sounding affordable audio system for just a few hundred dollars. read more…

Firestone Little Country 3 – 6922 Heaphone Amplifier/ Pre Amplifier – Whats new vs LC2?

Firestone Little Country 3 – 6922 Heaphone Amplifier/ Pre Amplifier – Whats new vs LC2?

The Little Country III is Proof You Don’t Have To Spend $1000 or More on na Tube Headphone Amp to Get That Coveted Audiophile Sound!

“If you’re like many audiophiles you spend a lot of time critically listening and are forever analyzing everything. But how about this instead, you put on your favorite music, relax into your most comfortable chair, and experience pure musical bliss without any tweaking or tinkering – The Little Country III lets you do just this”

read more…

RudiStor NX-02 Sistema Headphone Amp, Ultrasone ProLine 2500 Headphones

RudiStor NX-02 Sistema Headphone Amp, Ultrasone ProLine 2500 Headphones

In this day and time where most new music listeners develop their tastes by way of ear buds, it’s been nice to see resurgence in the desire for quality headphones. Having grown up in a time when self-paced lessons included wearing plastic headsets that had the comfort level of vise grips, its always pleasant to put on a comfortable pair of “cans” and push those painful memories deeper in the grey matter of distant memories. Recently, I received an email offering me the possibility of reviewing a “Sistema”, a very peculiar audio combination, something that could be called “a Dynamic Headphone System”. It is an amp/ headphone combo. From one side the amp made by RudiStor, a small Italian based company, and maker of some of the most highly regarded headphone amplifiers available (including electrostatic ones). They teamed together with Ultrasone, the German headphone manufacturer (another European based company) and designed an amp specifically tuned for the Ultrasone’s PROLines 2500 open-air headphones.

Specifications:

  • Rudistor NX-02
  • Maximum Output (Voltage Swing): 17Vpp
  • Slew Rate >4VuSec
  • Bandwidth: 0-100.000 Hz 0.05db
  • Output Impedance: 0.01 Ohm to 1200
  • THD: 0.002% (3Vpp on 32 Ohm)
  • Gain: 14dB
  • Input Impedance: 47 Kohm Technology: IC and Bipolar Discrete Input : RCA golden
  • S/N: 115db
  • Output: 2 * jack full size
  • Dimensions (cm): 24*30*7
  • Humm Level: Not measurable
  • Weight (Kg): 4.0
  • Price $ Not yet announced.
  • Ultrasone ProLine 2500
  • S-Logic™ Natural Surround Sound
  • Dynamic principle
  • Frequency range 8-35.000 Hz
  • Impedance 40 Ohm
  • Sound pressure level 94 dB
  • MU Metal bufferboard, reduced field emissions in accordance with ULE standard
  • Driver 40 mm titanium-plated
  • Weight 292 g (without cord)
  • Price $399

read more…

HeadRoom Total BitHead

HeadRoom Total BitHead


Play the tape machine, make the toast and tea When I’m mobile

Well, I can lay in bed with only highway ahead When I’m mobile

Keep me moving

…or so sang Pete Townshend 35 years ago on The Who’s 1971 classic, Who’s Next. Today, the ubiquity of cell phones, laptop computers and portable audio devices hasn’t so much changed the world as given us what we’ve wanted all along: the ability to move around freely while taking the comforts of home along with us. What of these comforts do audiophiles dream about more than any other? I’ve got two: 1.) To carry my entire record collection in my shirt pocket; and 2.) to listen to it anywhere with the same high fidelity I enjoy in my listening chair at home. #1 is covered…my iPod has more than a solid week’s worth of music, all ripped at the highest bit rate possible, and it’s only half-full. But what about the “high fidelity” part?

This month I took a look at one of HeadRoom’s entry level offerings, the newlyre designed Total BitHead. read more…

Building a Stereo Headphone Amplifier – From a Kit

Building a Stereo Headphone Amplifier – From a Kit

Nearly all vintage pre-amps/integrated amps have headphone jacks. Unfortunately some of them don’t work, or stop working. Also unfortunately, some of these jacks are hard to get at, and some are directly mounted to the main PC board or one of its satellites (meaning you have to match its configuration in a catalog. Building a headphone amp from a kit is actually an easier “fix”. It is also known that some audiophiliacs favor separate headphone amps for reasons that may not be psychosomatic, but this amp, the Ramsey model #SHA1, isn’t audiophile class. I’ve been browsing an audiophile class catalog (from Acoustic Sounds Inc.) and didn’t notice anything electronic in there for around $30, which is what the SHA1 goes for. (If you haven’t seen this catalog, I recommend it; there are some amazing things in it – including some strange looking turntables and the prices are even more amazing.) This amp sounds decent supplying my Sennheiser 595 phones. There are a few caveats, but I’ll get to them later. read more…

WordPress.org

Copyright © 2000-2018 HighFidelityReview – Hi-Fi systems, DVD-Audio and SACD reviews - HQ Hi-Fi Review Theme by ThemeShift.com