Blossom

BLO-0299 is an audiophile quality headphone amplifier which is housed in beautiful natural wooden box. Its compact size is excellent for desktop use. BLO-0299 can drive balanced headphone (also two single ended headphones). Balanced headphone listening provides a more natural, musical, and detailed sound with great stereo imaging.

The BLO-0299's Integrated circuit was designed to provide great detail and clarity. The circuit design is clearly better than even the best discrete designs. High quality metal film resistors are used, no electrolytic capacitors are in the signal path. All passive parts are hand selected to provide close matching and even the solder used is high grade. BLO-0299 has achieved ultra low noise and distortion, very flat frequency response, and great phase property. The BLO-0299 was designed for true musical tone.

Features
Balanced Headphone Amplifier

2 x single ended normal headphone outputs)
Cross Feedback Balanced Circuit (2 output circuits for each output channel).
Realistic True Tone Preamp design which use ultra low noise / high speed IC.
Point to point wiring pattern for circuit board design to avoid common impedance.
To keep signal path as short as possible, relays are used for all signal switching
High quality metal film resistors are used
No electrolytic capacitors in the signal path
Balance Stereo inputs (XLR,TRS Combo) and Unbalance RCA input (selectable)
Hi(+10dB) /Lo(0dB) Gain mode
Master Volume Control function (variable level line outputs)
Headphone output mute function
Housed in natural walnut wooden box
Hairline finished stainless steel panel
Same walnut volume knob and feet

1, Headphone Outputs
1/4" stereo plug / XLR combo type

2, Outputs Selector Switch
Headphone or Line output

3, Gain Selector Switch
Lo (0dB) or Hi (+10dB) gain

4, Input Selector Switch
Select Balanced XLR("1/4) Combo or Unbalanced RC

5, Volume
We recommend use volume control 9 o'clock position or more.
(for accurate L/R balance within 0.3dB)

6, Balance Input Connectors
1/4" stereo plug / XLR combo type

7, Unbalance Input Connectors
RCA unbalanced inputs

8, Line Outputs
Volume controlled RCA unbalanced outputs.

9, Power Switch
Headphone output is muted 2 seconds when power turn on.
Line outputs are not muted.

10, DC input
24V power adapter included.

BLO-0299 balanced signal output circuit, unaffected, accurate full signal.

* Cross Feedback Balanced Circuit

Specifications

Frequency Response　　
＠0ｄBu OUT　+/- 0.5ｄB , 50Ω　Load
0.1 Hｚ～ 80 ｋHz

Phase Deviation
＠0ｄBu OUT 50Ω　Load , 20Hz～20ｋHz　　
＜0.1�

THD＋N　　　
<HEADPHONE OUTPUT>　　
＠+15ｄBu OUT , 1ｋHz , 50Ω Load ＜0.001 ％　
＠+10ｄBu OUT , 20Hz～20ｋHz , 50Ω Load　　＜0.005 ％

<LINE OUTPUT>　　
＠+10ｄBu OUT , 1ｋH　　＜0.001 ％

Maximum Output Level ＠1ｋHz , 50Ω　Load　+15 ｄBu　

IMPEDANCE　
Balanced Input: ＠1ｋHz　20 ｋΩ
Unbalanced Input: ＠1ｋHz10 ｋΩ

Dynamic Range: >114 ｄB

Power Supply　DC 24V　mA

Size 64 x 158 x 212 mm

Welborne Labs Upgraded Power Supply

The next step in taking your Blossom to the next Level.

Welborne's PSU Power Supply Upgrade is intended to replace the wall wart power supply that is provided with your audio gear. There are two types of wall warts. The first type is an AC-to-AC voltage converter which drops the house level AC voltage (115V or 230V) down to a usable level. This is just an external power 'transformer' which means the actual power supply is inside of the audio unit. If this is what you have - we can't help you.

The second type of wall wart is an AC-to-DC voltage converter. This is a real power supply that converts the house AC voltage to a DC voltage, for example: 5 Volts DC at 2A of current. If this is what you got - WE CAN HELP! If your owner's manual does not specify the voltage, in most cases it will be printed on the wall wart cover.

Welborne's upgrade design incorporates a tightly regulated linear power supply featuring low noise Schottky rectifier diodes, low noise, low drop-out voltage regulator chips, Ultra low impedance Nichicon capacitors and a high-current-low-noise-split-bobbin transformer (get it? it's designed for very low noise). Our power supply measures less than 50 microvolts of ripple under full load resulting in very quiet operation with plenty of reserve current for good dynamics.

Additional benefits are obtained with the use of a ceramic fuse, Vishay/Dale 1% metal film resistors, Wima polypropylene bypass cap, and a new heavier gauge umbilical cable between the power supply and audio equipment. The aluminum chassis measures just: 4.25"W(108mm) x 7"D(178mm) x1.8"H(46mm) and is available in red or black anodized finish. The AC power cord is NOT included and must be purchased separately.

The sonic results achieved include a blacker background with excellent low level resolution and detail, an expanded soundstage along with deeper and tighter bass. We're confident you will hear the improvement!