Moog type ladder filter VCF (LPF).
Superb sounding low pass filter giving that authentic vintage Moog type sound. It has a new front panel design with elongated holes.
Filters are the means by which we modify sounds to create new sounds. The most common way in which they do this is by removing parts of the audio spectrum - attenuating the low frequencies and/or the high frequencies, or maybe by creating 'holes' in the spectrum. Other types of filter may enhance parts of the spectrum, or they may act in the time domain, removing sections of the signal rather than modifying its frequency response.
The most common filter in analogue synthesis is called the low-pass filter and its name exactly describes its function: it passes the part of the spectrum below its cut-off frequency, but attenuates those frequencies that lie above the cut-off frequency.
The most highly revered low-pass filter in analogue synthesis was developed by Dr Robert Moog in the late 1960s. It first appeared in the modular Moog synthesizers of that decade, but its finest hour came in 1970 with the appearance of the Minimoog. Largely because of its filter, this rather limited instrument has remained the standard by which all others are measured, and has survived nearly 40 years with its reputation intact as the most desirable of all integrated monophonic synthesisers.
Moog's filter used a circuit called a ladder network. In itself, there is nothing special about this, and many other filter designs are capable of emulating its response. However, Moog's circuit was flawed because it exhibited a small amount of distortion. Many engineers would have sought to correct this but those at Moog Music did not, perhaps because they recognised that the sound was musically pleasing. Indeed, if a synthesiser sounds like a Minimoog, it is called "warm" or "creamy". If it does not it will often be referred to as "thin" or "uninspiring".
The RS-100S 24dB/oct low-pass filter imitates the Minimoog's filter and exhibits almost identical characteristics in both the frequency domain (i.e. what it does to audio signals) and the time domain (i.e. its response over time to CVs). Below the cut-off frequency the response is approximately flat down to DC. With the filter fully open, it will pass signals approaching 20kHz.
In use :
CUTOFF FREQUENCY
You can control the cut-off frequency (Fc) using the FREQUENCY control. In its fully anticlockwise position, Fc is approximately 30Hz. As you rotate the knob clockwise Fc will increase until, it its fully clockwise position, it exceeds 15kHz. These extreme positions are called 'closed' and 'open' respectively.
You may also control Fc using one or both of the CV inputs:
CV-IN 1V/OCT:
If you apply a CV conforming to the 1V/oct standard, Fc will track the CV in exactly the same way as a VCO would if you applied the same CV to its CV-IN 1V/OCT socket. If the CV is supplied from a keyboard then, in common parlance, the filter is tracking the keyboard 100% and, with the resonance at maximum, you can 'play' the filter as if it were a conventional oscillator.
CV-IN VARY:
You may wish Fc to track incoming CVs at >100% or <100%, so the CV-IN VARY input is provided. This socket and its associated LEVEL control allow you to specify the filter's sensitivity to CVs within the range ∞V/Oct to approximately 0.4V/Oct. The former of these makes the filter invariant to incoming CVs, while the latter makes it over-sensitive compared to the 1V/Oct input.
RESONANCE
The RS-100N has variable resonance, or 'Q'. As this is increased from its minimum, the filter will accentuate Fc, and progressively attenuate frequencies below Fc as well as those above it. As the resonance is increased further, the RS-100N will exhibit the aggressive 'ringing' associated with Moog filters, and it will severely colour any signal passed through it. At the highest Qs, the filter itself will begin to oscillate, and even in the absence of any signal presented to its inputs it will then act as a sine wave generator, the frequency of which is Fc itself.
You can control 'Q' manually using the RESONANCE control. In its fully anticlockwise position, Q is approximately zero, and there is no emphasis of the signal at Fc. As you rotate the knob clockwise Q will increase until, it its fully clockwise position, the filter produces a sine wave of frequency Fc.
There is no voltage control of Q.
INPUTS AND OUTPUTS
The RS-100N has two inputs: SIG 1 IN and SIG 2 IN, each with an associated LEVEL control. The inputs accept signals in the range ±10V, and these signals are mixed so that they can be filtered simultaneously.
The LEVEL controls offer unity gain in approximately the 2 o'clock position, marked '4' on the panel.
At their fully anticlockwise position they attenuate the signal fully (MIN = -dB gain) while at their fully clockwise position they offer a small gain. This (or, indeed, any high level signal) allows you to 'overdrive' the filter inputs for characteristic distortion.
There is a single output that carries a signal in the range ±10V.
12HP
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
Product Overview
Moog type ladder filter VCF (LPF).
Superb sounding low pass filter giving that authentic vintage Moog type sound. It has a new front panel design with elongated holes.
Filters are the means by which we modify sounds to create new sounds. The most common way in which they do this is by removing parts of the audio spectrum - attenuating the low frequencies and/or the high frequencies, or maybe by creating 'holes' in the spectrum. Other types of filter may enhance parts of the spectrum, or they may act in the time domain, removing sections of the signal rather than modifying its frequency response.
The most common filter in analogue synthesis is called the low-pass filter and its name exactly describes its function: it passes the part of the spectrum below its cut-off frequency, but attenuates those frequencies that lie above the cut-off frequency.
The most highly revered low-pass filter in analogue synthesis was developed by Dr Robert Moog in the late 1960s. It first appeared in the modular Moog synthesizers of that decade, but its finest hour came in 1970 with the appearance of the Minimoog. Largely because of its filter, this rather limited instrument has remained the standard by which all others are measured, and has survived nearly 40 years with its reputation intact as the most desirable of all integrated monophonic synthesisers.
Moog's filter used a circuit called a ladder network. In itself, there is nothing special about this, and many other filter designs are capable of emulating its response. However, Moog's circuit was flawed because it exhibited a small amount of distortion. Many engineers would have sought to correct this but those at Moog Music did not, perhaps because they recognised that the sound was musically pleasing. Indeed, if a synthesiser sounds like a Minimoog, it is called "warm" or "creamy". If it does not it will often be referred to as "thin" or "uninspiring".
The RS-100S 24dB/oct low-pass filter imitates the Minimoog's filter and exhibits almost identical characteristics in both the frequency domain (i.e. what it does to audio signals) and the time domain (i.e. its response over time to CVs). Below the cut-off frequency the response is approximately flat down to DC. With the filter fully open, it will pass signals approaching 20kHz.
In use :
CUTOFF FREQUENCY
You can control the cut-off frequency (Fc) using the FREQUENCY control. In its fully anticlockwise position, Fc is approximately 30Hz. As you rotate the knob clockwise Fc will increase until, it its fully clockwise position, it exceeds 15kHz. These extreme positions are called 'closed' and 'open' respectively.
You may also control Fc using one or both of the CV inputs:
CV-IN 1V/OCT:
If you apply a CV conforming to the 1V/oct standard, Fc will track the CV in exactly the same way as a VCO would if you applied the same CV to its CV-IN 1V/OCT socket. If the CV is supplied from a keyboard then, in common parlance, the filter is tracking the keyboard 100% and, with the resonance at maximum, you can 'play' the filter as if it were a conventional oscillator.
CV-IN VARY:
You may wish Fc to track incoming CVs at >100% or <100%, so the CV-IN VARY input is provided. This socket and its associated LEVEL control allow you to specify the filter's sensitivity to CVs within the range ∞V/Oct to approximately 0.4V/Oct. The former of these makes the filter invariant to incoming CVs, while the latter makes it over-sensitive compared to the 1V/Oct input.
RESONANCE
The RS-100N has variable resonance, or 'Q'. As this is increased from its minimum, the filter will accentuate Fc, and progressively attenuate frequencies below Fc as well as those above it. As the resonance is increased further, the RS-100N will exhibit the aggressive 'ringing' associated with Moog filters, and it will severely colour any signal passed through it. At the highest Qs, the filter itself will begin to oscillate, and even in the absence of any signal presented to its inputs it will then act as a sine wave generator, the frequency of which is Fc itself.
You can control 'Q' manually using the RESONANCE control. In its fully anticlockwise position, Q is approximately zero, and there is no emphasis of the signal at Fc. As you rotate the knob clockwise Q will increase until, it its fully clockwise position, the filter produces a sine wave of frequency Fc.
There is no voltage control of Q.
INPUTS AND OUTPUTS
The RS-100N has two inputs: SIG 1 IN and SIG 2 IN, each with an associated LEVEL control. The inputs accept signals in the range ±10V, and these signals are mixed so that they can be filtered simultaneously.
The LEVEL controls offer unity gain in approximately the 2 o'clock position, marked '4' on the panel.
At their fully anticlockwise position they attenuate the signal fully (MIN = -dB gain) while at their fully clockwise position they offer a small gain. This (or, indeed, any high level signal) allows you to 'overdrive' the filter inputs for characteristic distortion.
There is a single output that carries a signal in the range ±10V.
Technical Specs
Shipping Details
How much is my shipping?
Shipping is automatically calculated before you submit your payment information. Simply add items to your cart and proceed to the checkout page, where you'll be offered shipping options and their prices. In the UK it's normally around £4 for order values under £150, and free above that. Shipping to mainland EU is typically between £7 and £20, depending on the shipping method and the size and weight of the order.
Do you ship to my country?
Almost certainly - the site will give you an estimate of shipping costs if you add an item to the cart and then enter your country and postcode. If you have specific requirements (such as if you prefer UPS over FedEx, for example) then let us know in advance and we'll try to work something out for you.
Shipping methods
We use a combination of Parcelforce, DPD, Royal Mail and UPS for the UK, and for international orders it's either Royal Mail, UPS, DHL or FedEx depending on where you are in the world. If you have a particular preference then try to let us know BEFORE you order so we can look into it for you. Please note that there may occasionally be additional shipping charges if you live in a remote area, depending on what surcharges are applied by the shipper. We'll get in touch to discuss this with you in such cases.
Dispatch times
For UK orders, we normally dispatch the same working day if we get the order before 15:00. If you have a really urgent situation then of course drop us an email before ordering and we'll always do our absolute best to accommodate you.
For international orders, we normally dispatch the same day if we get the order before 13:00 but again, occasionally it might be the next day before we can send it out, and sometimes FedEx or UPS may come a little earlier than scheduled which would also push an order into the next day.
Shipping times
Since April 2020 the couriers we use have suspended guarantees for shipping times, so even though we're paying them for priority services - 24-48 hours for most of the world - in practice it's often an extra day on top and sometimes it can be longer.
There is absolutely nothing we can do about this unfortunately. If you are outside the UK and it's a life-or-death situation where you absolutely MUST have that passive mult for the next day then... it may be better to find a local supplier.
Saturday shipping
If you're in the UK and you order before 15:30 on a Friday then we can send something for a Saturday delivery (NB: this applies to UK mainland addresses only). The success rate with DPD is about 95% so it's worth a punt most of the time. Please note that if you select Saturday shipping on an order placed earlier in the week, we'll wait until Friday to ship it.
Pre-orders
If a product is listed as a pre-order, it means we've ordered it from the supplier but it's not physically in stock yet. The product listing will include an estimated shipping date based on the best information we have from the supplier, but do bear in mind this is subject to change and is not a guaranteed date.
If you place an order containing a mixture of in-stock and pre-order items, we'll normally hold off on shipping anything until the pre-order item(s) have arrived, rather than splitting it into multiple shipments. If you need the in-stock items sooner, we'd recommend placing separate orders. As always, please get in touch if you have questions.
