Pre One

The Dual-Channel Microphone Preamplifier

with discrete technology for outstanding sound.

number one in sound

For us the sound is always in the foreground. When it sounds good, we like to listen. To get such a sound, you need experience and technical finesse. We have incorporated both into the Series One.

Discrete preamplifiers

Pre One is equipped with two preamplifiers. These have a discrete design and they are tuned for an open and transparent sound characteristic. In addition to the microphone input, the second preamplifier also features a Hi-Z instrument input – so instruments like electric guitars, for example, can benefit from the sound of the Pre One.

In terms of technology and sound, the preamps have the same characteristics
as those in the SPL Channel One Mk3!

The gain control can be used to adjust the preamplifcation. The control range ranges between
+8 dB and +62 dB – so even really demanding microphones can unfold their full potential!
(The green signal LED indicates that a signal is present.)

High-pass filter

A high-pass filter with 6 dB per octave is available in both preamp sections and reduces subsonic noise below 80 Hz when activated. This low-cut filter can be used for the microphone inputs as well as for the instrument input on the second amplifier.

48V

Both preamplifers have a 48V switch. This switch activates the required phantom power of 48 volts for the use of condenser microphones.

Ø

The phase reverse function of every preamplifiers reverses the polarity of the signal. After pressing the switch, the phase is reversed by 180°.

Flair / Contour –
The perfection of sound

For each of the two preamps, Flair and Contour provide an analog EQ preset to perfect the sound.

When Flair is activated, it gives the signal an incredibly beautiful range of high frequencies – silky highs is the key word here.

When Contour is activated, the signal perfectly blends into a compact mix while retaining its natural presence and strength.

PAD

The PAD switches for each preamp section are located as DIP switches on the rear of the Pre One. These activate an attenuation of the signal of the microphone input by 20 dB, so that even very high levels can be processed with the Pre One. This is the case, for example, with loud
percussion or brass recordings.

Mic inputs

Two microphones can be connected to Pre One and
be amplified simultaneously. The microphone inputs are are equipped with Neutrik XLR sockets and goldplated contacts. The signal transmission is electronically balanced, at a nominal level of +0 dBu.

Instrument input

The preamplifier 2 of the Pre One also features an ultra low-noise Hi-Z instrument input – so instruments with a Hi-Z signal, such as electric guitars, electric basses or various synthesizers, can also benefit from the sound of the Pre One. If an instrument is plugged into the instrument input, mic input 2 is deactivated.

Line outputs

Each of the two microphone preamps has a separate line output. These outputs are designed as balanced TRS socket and can therefore be ideally connected to all audio interfaces.

Pre One is the perfect addition to the
SPL Marc One – monitoring and recording controller.

Together, both devices offer everything you need for
professional recording and monitoring!

Power Supply

Good sound always starts with the power supply. This is where you lay the foundation for the performance of
the entire device. Although we “only” supply a 12 V plug-in power supply unit, the secondary power supply inside generates a voltage level of +/-17 volts for the analog audio sections with which professional levels of up
to +22.5 dB can be achieved!

An elaborate low-drop operating voltage regulation provides more “juice” and regulates cleanly
even when the maximum operation voltage is reached.

Number One in Sound

With the Series One – just as with all other SPL devices – we develop not only according to plan, but also by
ear from the very beginning. Many important components are installed on the circuit boards using
Through-hole technology. This way we can ensure that we can use the best sounding components.

Home is where the heart is

That’s why we manufacture all devices in our own production facility in Niederkrüchten on the Lower Rhine, Germany

Pre One Blog Posts

Manual

Specifications

Analog inputs & outputs; XLR & Jack (balanced)

Maximum Input level (Mic, Gain +8 dB)
+13.5 dBu
Maximum Input level (Instrument, Gain -6 dB)
+23.5 dBu
Input impedance (Mic)
10
Input impedance (Inst)
1.1
Output impedance
75 Ω
Frequency range (30 dB Gain)
10 Hz–200 kHz
THD+N (Mic, 30 dB Gain)
0.0028 %
THD+N (Mic, 50 dB Gain)
0.014 %
THD+N (Mic, 62 dB Gain)
0.017 %
THD+N (Instrument, 0 dB Gain)
0.0039 %
Equivalent Input Noise (EIN)
126 dBu
Dynamic range
117 dB
Noise (Mic, A-weighted, 150 Ω load, 30 dB Gain)
-95 dBu
Noise (Mic, A-weighted, 150 Ω load, 50 dB Gain)
-77 dBu
Noise (Mic, A-weighted, 150 Ω load, 62 dB Gain)
-68 dBu
(CMMR) Common mode rejection Mic Input
>75 dB

Internal Power Supply

Operating voltage for analog audio
+/- 17 V
Operating voltage for relays and LEDs
+12 V
Phantom power
+48 V
Power consumption
7,0 VA VA

External Power Supply

AC/DC switching adapter
Mean Well GE18/12-SC
DC plug
Innen-Pin 2,1mm (+); Außen-Ring 5,5mm (-)
Input
100 - 240 V AC; 50 - 60 Hz; 0.7 A
Output
12 V DC; 1.5 A

Dimensions & Weight

W x H x D (width x height incl. feet x depth)
210 x 49.6 x 220 mm
8.23 x 1.95 x 8.66 inch
Unit weight
1.45 kg
3.2 lbs
Shipping weight (incl. packaging)
2 kg
4.4 lbs

Reference: 0 dBu = 0.775V. All specifications are subject to change without notice.

Other Series One products

ProAudio
HiFi
ProAudio
HiFi

Calculation of VAT (value added tax)

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If your country cannot be determined via geolocation and you are not logged in as a user with the billing address of your country, the prices are displayed including the VAT of Germany (19%).

What does it actually mean …

In Stock!

The product is in stock in our warehouse in Niederkrüchten, Germany, and will be shipped the same or next working day.

We process the orders after receipt of the order and update the stock in the online shop regularly. If the product is no longer available at short notice due to high order volume, you naturally have the right to withdraw from the purchase (see Right of Withdrawal).

In any case, you will receive an e-mail with details of the delivery and the estimated delivery time.

Available soon!

The product is not in stock in our warehouse in Niederkrüchten, Germany. Usually it will be available again within 5 working days.

In any case, you will receive an e-mail with the details of the delivery and the estimated delivery time.

Of course you have the right to withdraw from your purchase (see Right of Withdrawal).

Currently unavailable.

This product is currently sold out and unavailable.

Was bedeutet eigentlich …

Auf Lager!

Das Produkt ist in unserem Lager Niederkrüchten vorrätig und wird noch am selben oder nächsten Werktag versendet.

Wir arbeiten die Bestellungen nach Bestelleingang ab und aktualisieren den Bestand im Online-Shop regelmäßig. Falls das Produkt wegen hohem Bestellaufkommens kurzfristig nicht mehr verfügbar ist, hast du selbstverständlich das Recht, vom Kauf zurückzutreten (siehe Widerrufbelehrung).

In jeden Fall erhältst du eine E-Mail mit den Einzelheiten der Lieferung und der voraussichtlichen Lieferzeit.

Bald verfügbar!

Das Produkt ist in unserem Lager Niederkrüchten nicht vorrätig. Gewöhnlich ist es innerhalb von 5 Werktagen wieder verfügbar.

Auf jeden Fall erhältst du eine E-Mail mit den Einzelheiten der Lieferung und der voraussichtlichen Lieferzeit.

Selbstverständlich hast du das Recht, vom Kauf zurückzutreten (siehe Widerrufbelehrung).

Zur Zeit nicht verfügbar.

Dieses Produkt ist derzeit ausverkauft und nicht verfügbar.

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