£ 300.00 GBP

Phase & Frequency Response Compensation Board (PFRCB)

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Phase & Frequency Response Compensation Board (PFRCB)

left at our introduction price of
£ 300.00 GBP
Digital Download
Per Drive Unit
(available as a single mono or stereo pair)
Difficulty:

The PFRCB electrically balances the inherent rise in efficiency at the upper midrange of Lowther speaker units. This tilts the frequency response without altering the signature of the driver. We have had very positive results in the Lowther Listening Room and we would recommend an audition. We recommend using the PFRCB with 8 Inch DX drivers and they are currently only recommended for use in our Fidelio Mark III and Mark II cabinets.

Every Lowther drive unit comes with a complementary digital downloaded plan. Please enter your plan of choice at the checkout.

Lowther Plans are free when you buy a new Lowther Drive Unit. Please see below to find out which drive units will fit this cabinet.

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Lowther Phase & Frequency Response Compensation Board

What it does

The LPFRCB electrically balances the inherent rise in efficiency at the upper midrange of Lowther speaker units. All single full-range drivers with 'whizzer' cones have a zone in their frequency response where the acoustic wave produced by the larger part of the cone overlaps with that generated by the inner one. A good partial remedy is a carefully designed Phase Plug fitted to the centre pole, this is usually bullet shaped for the PM series & a diffused-hole plug for the DX. The higher efficiency PMs (4,7) benefit from the large wooden 'Light-Bulb' phase plugs, depending on application in each cabinet design. Many owners experiment with different shapes, with varying success. 

Why does this need further correcting?

It may not! Many Lowther owners are very content with the presentation of the music in their present situation. 'If it ain't broke, don't fix it'. Most listeners who enjoy their experience with 'vintage' equipment and /or good valve amplifiers & phono stages are fiercely loyal to their original Lowther speakers. It is a testament to the original post-war design of the Voight/Lowther drive unit that it is still highly regarded for it's unparallelled transparency & lifelike rendering of music.

However, it is accepted & well documented that many have a negative opinion of 'Lowther Sound' based on their experience with the rising midrange 'peak', often highlighted by variables beyond our control - mismatched equipment, poorly designed amplifiers, especially some transistor-based from the 70s & 80s, limited or uncontrolled room response, drivers used incorrectly as to cabinet design, etc. 

This is now particularlarly relevant with the rapid development of higher quality digital sources?

In our recent experience, yes. Using the board often brings extra audible benefits in the majority of listening environments & sound sources - particularly where the source is of very high quality, including phono (vinyl disc).

How can I find out for myself?

We find that the LPFRCB employed in our reference system has had 100% positive comments so far; so we recommend an audition, especially with single DX based speakers.   We have set up in our Northampton demonstration room a pair of Fidelios, fitted with DX3 or DX4, switched for A-B comparison. Also new Acousta 116 with PM6a fitted can be compared. You alone are the judge - there is no 'right or wrong' sound. The sound source is not degraded and a crossover network is not employed, as it is not required for a single driver.  

Boards can be ordered with new drive units, supplied fitted to finished new cabinets, or retro-fitted to most DX single applications, usually without significant modification. The connections simply interrupt the existing +/- wires to the driver.

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All our loudspeakers are analysed in our listening room using REW acoustics software. The aim is to show a graphic comparison between each Lowther enclosure on demonstration with the recommended drive unit installed for that type of cabinet.
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Shipping and Returns
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Speakers
All our speakers are handmade in Great Britain and fully tested prior to being shipped. Lead times will vary depending on the cabinet ordered, however this will be fully explained by a Lowther representative when placing your order with us.

Drive Units
We typically ship within 5 days of placing your order of drive units; however, some orders may take up to 10 days to process. Please note that we do not ship on Saturdays or Sundays.

All orders will arrive within 5 - 10 business days.  We offer shipping worldwide. However, we don’t ship to countries that are not operated by DHL or Parcel Force. All orders are shipped and tracked via DHL or Parcel Force.

Lowther is not responsible for any delays caused by the customs clearance process, or taxation in overseas countries.
Lowther is not responsible for lost package due to incorrect address supplied by the sender.

For more information and shipping inquiries, please contact us at hello@lowtherloudspeakers.com

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