I finally laid my hands on the infamous unit. Weighting in at about 25kg each, it is a well constructed speaker.
|753 without cover. Meridian A500 (with puppet on top), Quad ESL Pro63 in the rear and the Technics Honeycomb|
Upon initial listening using the copper cable transferred from the Technics Honeycomb, the 753 was disappointing - sounding compressed, glimpse of imaging, restricted headroom, with plentiful of flabby bass???
I was driving it using the Leak Delta 30 with only 15W RMS per channel but enough to drive my other well known speakers ... (not tried the Leak on my stored Celestion SL6s and the Pro63 yet)
Searching the internet, there were many comments regarding using an amp of atleast 50W per channel as well as mods to the crossover, etc to get the best from the 753.
What I did note was that the above setup while had plentiful bass and sounding compress, the 753 did convey the details as per my other speakers.
Hence I decided to try a simple experiment before going for the "works". I replaced the existing copper cables with my old QED Silver Anniversary (newer version has less than half the original core size).
Sounds almost top flight via the low wattage Leak Delta 30 using QED Silver Anniversary speaker cables!!! Like night and day by just changing the speaker cables.
On the following week I managed to add a Sansui AU-7900 to my collection.
Tried pairing it with the 753 via the copper cable (since it has more power than the Leak). Bass was respectable but over-emphasized. The treble had the 'behind the veil'effect. Hence I inserted a bypass using a ROE 0.022uF for the 10uF and 6.8uF capacitor. And insert WIMA 0.33uF bypass for the 470uF capacitors. Furthermore added 2 layers of foam padding to the bottom cavity as the original was empty(?).
The cross-over unit looks a bit different from the pix(s) on DIYAUDIO and other websites as this is the Freedom model - without the 1,000uF capacitors and a simplified crossover board.
|After adding bypass to capacitors|
|Different view of cross-overs|
|Add 2 layers of foam|
|Speaker cable from the AU-7900 - more than enough 'juice'to drive the 753F|
Been an hour and the sound is beginning to take shape ... vocals are sweeter and bass is firmer. Has the makings of a keeper!
Using the previous setup and copper wires, the 753F seem to slightly warmish. Bass became more firmer, voices were almost "being there" but there seem to be a very light veil still in-place.
Connecting the 753F via QED Silver Anniversary seems to be it. Everything is falling into place, with firm bass!!