Bakoon Products EQA-5640mk4 Phono amp

Manipulating the old equalizer curves

The EQA-5640mk4 is a phono equalizer amplifier that enables you to play vintage analog discs more correctly. Discs up to the 1950s had various equalizer curves in addition to the RIAA curve, which is the current standard equalizer curve. Each record company had its own standard when producing a master tape, and its own equalizer curve was set by the recording era and the record company. Currently, the National Association of Records = RIAA unifies the equalizer curve. Most of the phono equalizer amplifiers on the market naturally support RIAA, so when you listen to old discs before the mid-1950s, you'll be listening with a completely different setting. The EQA-5640mk4 is an equalizer amplifier equipped with 6 types of curves: standard RIAA and typical old equalizer curves NAB, COLUMBIA, FFRR, AES and OLD RCA. By using these 6 types of equalizer curves properly, you can enjoy the vintage sound of the latest records in the original sound.
The equalizer curve is designed that the variation of 1KHz gain is within 0.3dB when switching EQ. This is convenient when you want to check the change in sound by switching the curve. By muting, you can suppress the generation of noise when switching each selector, replacing the cartridge, cleaning the stylus tip, etc. Also, there is no loop noise in the power amplifier connection.

Low noise, high resolution

The EQA-5640MK4 uses a new generation SATRI circuit HBK(I)-IC and HBFBC to achieve a good S/N ratio and almost no noise or distortion.
In addition to switching between the MM and MC cartridges, the gain can be finely set in 6 stages according to the output voltage of the cartridge to obtain the optimum position without clipping. Use "HIGH1" for MC cartridges with extremely small output voltage and "LOW2" for high output MM cartridges with output voltage exceeding 10 mV.

The output circuit is equipped with conventional voltage output and current output SATRI-LINK. When SATRI-LINK is used, the output impedance is several tens of M ohms, and since the Bakoon preamplifier and power amplifier to be connected are insulated, inductive noise will not be picked up even if the cable is lengthened. it enables playback of high dimensional analog records.
The power supply is an analog power supply, which uses a high-quality and large-capacity toroidal transformer in a shield case, and by surface-mounting all components, it produces a direct sound with a thick coloring in the mid range. The size is the same as SCA-7511mk4, and it is a compact amplifier size.
1 line, MM / MC switchable
Output Voltage output x1, Current output (SATRI-LINK) x 1
Frequency characteristic 20Hz~50kHz
Maximum output 8V(1% distortion)
Distortion(1KHZ) 4V: 0.06%
S/N ratio -135dB(HIGH1)
EQ error ±0.3dB
Dimensions 70mm(H) x 236mm(W) x 293mm(D)
*As it is made to order, it may take some time from the scheduled shipping date.


Item review

Speaking of multi-curve phono equalizer, there is CAP-1004 of CAP series recently, EQA-5640MK4 has changed the basic internal configuration from SATRI-IC in the MK3 era to a newly developed circuit, which is almost the same as the CAP1004, in accordance with the multi EQ curve correspondence. It's kind of disappointing, as it's a substantial downgrade. (However, the sound of Bakoon SATRI-IC for comparison is surprisingly high-dimensional, so the sound quality is not so concerned..) If you are listening mainly to vintage records before the 1960s, being able to listen to the original sound according to the equalizer curve of the analog disc is far more valuable than listening to the sound when the equalizer curve does not match. Impression that the analog power supply of the toroidal transformer has a stable voltage and is thicker or more rich in the mid range than the CAP1004. The gain can be set in 6 levels in detail, which is compatible with recent high-output cartridges. In MK3, it was natural that the relay of MUTE, which was so badly broken and unpopular, was already taken measures in MK4. ..
The important function of multi-curve is that the equalizer curve used to be different depending on the record company and the time when it was recorded, and some discs do not have a recording format, so the sound will change surprisingly when the curves match. As if the muddy river returned to a clear stream where you can see the bottom of the river.. Also, although it should have been unified with RIAA around 1953-54, DECCA adopted FFRR even in the 1960s, even after the adoption of RIAA by other record companies, the position of the equalizer curve that the company used before has a better sound growth than the RIAA position, which is interesting. This will be the best item that invites us to a new quest for old analog records in our collection.


Bakoon Products EQA-5640mk4 Phono amp
Express checkout for international order

International order > Manufacture > Bakoon Products
International order > Category > Amplifier > Phono amplifier
数量 Qty
在庫 Stock: 有り

Browser translating cannot proceed checkout.