SPL Qure Premium 9738-P

Equalizer with Lundahl Transformers

The Qure is a two-channel, fully parametric three-band EQ for creative sound design of individual instruments and voices, as well as more complex music signals and mastering. It combines the circuit technology of different eras and also offers new, innovative filter circuit solutions for modern audio problems.

All filters in the Qure are build in series and have their own OP-Amps, reducing interference to a minimum, and providing individual activation of each filter.

The QURE Control:

The output of the EQ-stage passes through a tube circuit which is constructed based on a mixed voltage-current feedback technique with a high overload tolerance. The circuitry was calculated to produce a THD characteristic of the tube (Type ECC83) realising a pleasant and proper musical sound impression. In this tube, a special circuit coil-capacitor-resistor filter network (LCR) is switched. The LCR network is integrated in the negative feedback path of the tube circuit and thus reacts directly to the dynamic behaviour of the output signal of the EQ. Depending on the dynamic behaviour of this signal, the spectra for THD and phase (sensation timing) are varied by the filter. The resulting frequency spectrum can be varied with the Qure-potentiometer and generates a fresh, brilliant and silky sound atmosphere from the centre region throughout the upper treble range.

Proportional Q

The musical operation is assisted by the proportional-Q design of the filter, which realises an automatic and proper sounding reset of amplification or attenuation. A wide frequency spectrum is treated more sensitively by Qure than a narrow frequency cut. The Qure EQs sound very musical and permit more sensitive corrections in sound compared to constant-Q EQs. In revisions of masters or critical program material, the proportional-Q principle simplifies the adjustments of sound nuances making work easier and more efficient.

  • 2x 3-Band equaliser with variable notch filters
  • Three independent, series connected parametric filters each side
  • Qure circuit (tube LCR circuit)
  • Mid band with un-balanced "Non-Reciprocal Response" of boost/cut control
  • Variable input (-12 dB to +18 dB) and output (-7 dB to +4 dB)
  • Hard-Bypass for each filter band and both cut filters
  • Master Relay-Hard-Bypass for all filters
  • All potentiometers stepped for quick recall
  • Central grounding
  • Precision CMRR (CCMR 80dB)
  • Tube pre-heating to extend operation time
  • Oversized, integrated power supply
  • Lundahl input & output transformer (input: LL1540, LL1539 output)
  • Dimensions: 19" 2 U

Further information

Channels 2
Frequency Bands 3
Tube(s) Yes
Height units 2 U
Connectors Jack, XLR
5 customer ratings:
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  • 4
  • 3
  • 2
  • 1
4.6 / 5.0
  • handling
  • features
  • sound
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I expected more workmanship

Nasrulla, 25.01.2018
Sounds wonderful, as expected. There is no complaining. Annoying for too long warm up time after switching on. I have my doubts if this is necessary at all, The two tubes in there cost a total of 25? I do not understand why man should take care of their lifespan.
The packaging was also minimalist and cheap. The user manual and the power cord lay in the box just around, not even packed in the plastic bags. Decent inlay for the 2300? expensive device - no indication. Made of cardboard cut pieces, held together with tape - a shame for SPL.
Fingerprints of SPL employees visible on the housing. Even the Chinese do not allow that for a long time. They even build the 50? Devices in GLOVES.
All pots on the right half had been shifted to 2mm and not centered. Man could see nuts under there. I have the impression that the visual control is missing at SPL completely.
The reason why I did not send the EQ back to Thomann - because I do not think the next EQ would have been better.
So - a few things have pretty much disappointed me. but the sound and the possibilities offered by the EQ were first class.
Update 10.03 2018
The EQ failed the first time after half an hour of work. He sporadically went into bypass mode and then back again. Thomann refused the exchange and offered only the repair. I opened the EQ and found out that the ribbon cable from the front panel to motherboard was plugged in crooked. But I was not surprised anymore, I was already very disappointed by the quality of the EQ.
I'll think twice about SPL next time
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The warm EQ

26.08.2014
A very sweet EQ, with a wide range of possibilities, I'm not disappointed (although I just acquired it).

To use in an end of mixing chain or mastering, it allows a very nice correction and the option Qure and very pleasant when seeking to energize the harmonics. I couple it with a Thermionic Culture Vulture Mastering Plus and the combo works great!
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