DSP CORRECTION OF THE AMPLITUDE RESPONSE
The introduction of the LFR1100 brought about a lot of questions about using a Broadband Digital Signal Processor (DSP) between your pre-amp and your main amp in other speaker models for the purpose of smoothing out small anomalies in the amplitude response. These are referred to as ‘High Q’ corrections to the response curves.
In many ways a speaker’s amplitude response curve could be divided into two Q groups:
Audibility of small differences in amplitude over a wide frequency band (Low Q) is very noticeable and needs to be carefully addressed in the design on the speaker. On the other hand, audibility of small differences in amplitude over a narrow frequency band (High Q) is not very audible. The DSP in the LFR1100 already incorporates this High Q correction across the frequency band. Low Q correction is done in using the passive crossover network located inside the cabinet.
In response to all these inquiries we have created a DSP component that is able to do this High Q correction to the M80v3, VP180v3, VP160v3, and recently announced M100. The graphs below show the difference in the Listening Window response to an M80v3. Since the correction applied from the DSP is concentrated completely in the High Q group we would recommend this product for the discerning audiophile only as the audibility of this correction will be quite subtle.
The other feature on the DSP for the LFR1100 is the Boundary Switch, which is used to compensate for having your speakers very close to walls or large cabinets. Even though the M80s and M100s are not omnidirectional the proximity to the boundaries still does have an effect in the lower frequencies. For that reason we have included a Boundary Switch on the DSP for these models also which should be experimented with in your room as the effect of the rear wall proximity will vary from room to room.
M80 Frequency Response Curve without DSP
M80 Frequency Response Curve with DSP