Kab RF-1 Rumble Filter

Getting into LP's and startled at the big speaker cone movements that you're seeing? Thinking a better turntable will help? It may not! This very low frequency energy is called rumble. Much of it is actually cut into the record groove when the master disc was made. Other sources are mis matched tonearms, poorly damped tonearms and acoustic feedback. Often, the only way to suppress rumble is with a really good rumble filter. 
With rumble eliminated, the soundstage becomes more "still" and the bass actually tightens up because the woofers are no longer modulating and the power amp is no longer wasting current resources on sub audible noise.

The KAB Great Sound Escort RF-1 is a very fine transparent rumble filter that not only suppresses very low frequency (subsonic) energy, but also uses a unique active cancellation circuit that effectively suppresses vertical rumble too. Your subwoofers will thank you! Suppresses acoustic feedback too.

Two important things to know:

1. When records are made, frequencies below about 150Hz are combined to mono. This is done to avoid large out of phase groove excursions. 

2. When the stereo stylus moves vertically, the two signals produced are equal and 180 degrees out of phase. 
Therefore, below 140Hz, the music is in phase in the lateral stylus motion, and only out of phase noise is found in the vertical stylus motion. 
The KAB RF-1 takes advantage of this by electronically combining the left and right channels together below 140Hz. In so doing the filter effectively cancels vertically modulated noise. Vertical rumble comes generally from bearing noise of the disc cutting system. But since the music below 140hz is already mono on the disc, the musical information is unaffected. Below 20Hz, all signals are quickly attenuated at 18dB/Octave.

The RF-1 is a must for vinyl enthusiasts.

The KAB RF-1 is easy to install. Place it in between the phono preamp and control amp or in a process loop. It requires no attendance. It is happy to remain powered up at all times.

Payment methods accepted

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Payment

All items must be paid for within 7 days of the transaction date by one of the following payment methods:

Credit Card (All types accepted)
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If you are unable to make payment within the specified time period please let us know as soon as possible.

Returns

We want you to feel happy with your purchase, so if for any reason you are not, you may send your item(s) back to us within 14 days for a full refund or exchange-free of charge.

Please note, postage costs are non refundable except in the following circumstances:

* the item you receive is different to that ordered.

* OR the item you receive is damaged or faulty.

In the above cases a full refund/exchange will be issued including any additional postage costs incurred by the buyer.*

*Please note, we can only refund up to the minimum postage amount required to send your item(s) back to us. Therefore, we always recommend that items be returned to us using royal mails 2nd class service with recorded delivery for insurance purposes.

All items must be returned to us in their original condition within 14 days of receipt. Please let us know before hand why you are planning on sending an item back to us and remember to include this information in your return. It is also vital that you include your user id & item number so we can deal with your request for a refund or exchange as quickly as possible

All refunds will be issued via your original method of payment and normally take up to 3 working days to process.