Search found 5519 matches

by karatestu
Fri Feb 19, 2021 1:40 pm
Forum: DIY
Topic: Doc modding Marantz imperial 7
Replies: 1932
Views: 410463
Great Britain

Re: Doc modding Marantz imperial 7

5" bipole cubes are now wired up and playing. :guiness; :guiness; :guiness; Playing Supertramp Breakfast in America which is a superbly recorded album. Loving it. My best speaker so far. Steel lined cabs are really doing the business and the four lengths of fence post I put in to reduce the vol...
by karatestu
Thu Feb 18, 2021 9:14 pm
Forum: DIY
Topic: DIY thoughts of the day
Replies: 248
Views: 115273
Great Britain

Re: DIY thoughts of the day

Changed my mind about the Naim cases :roll: My hifi "sideboard" is going to have every single psu on the ground floor as it were. One big fat mains cable from the NVA BMU to the sideboard where inside it will be split to the various psu's on the lowest level. To fit in an alcove the sidebo...
by karatestu
Thu Feb 18, 2021 8:31 pm
Forum: Music
Topic: Your last listen
Replies: 8379
Views: 2174148
Great Britain

Re: Your last listen

Lonnie Liston Smith and the Cosmic Echoes - Expansion
by karatestu
Thu Feb 18, 2021 7:24 am
Forum: DIY
Topic: Doc modding Marantz imperial 7
Replies: 1932
Views: 410463
Great Britain

Re: Doc modding Marantz imperial 7

My next job is to rewire the 5" bipole so I can triamp them . It's turning into a lovely speaker for low to moderate listening in a small problematic room like mine. A sacrifice to the room mode gods was required. This speaker is just about finished. But the 6.5" version isn't finished. A ...
by karatestu
Wed Feb 17, 2021 8:12 pm
Forum: DIY
Topic: Building a DIY amp with NVA amplifier boards
Replies: 346
Views: 199527
Great Britain

Re: Building a DIY amp with NVA amplifier boards

Some observations. When you change the impedance seen by the amp from 16 ohms to 4 ohms by changing two mid bass wired in series to wired in parallel the volume of the mid bass goes up which wrecks the balance of the speaker (unless you have two tweeters which you can do similar with). When taking t...
by karatestu
Wed Feb 17, 2021 7:57 pm
Forum: Admin-Intro-Chitchat
Topic: 1970 radiogram.
Replies: 5
Views: 2107
Great Britain

Re: 1970 radiogram.

I do realize that this is a direct rip off of what you intend. Just got me thinking that it maybe the way to get some decent music back into our living room. Wife fed up with cables, boxes, speakers and shelves that you cant put "things" on. Only need the "carcase" which might s...
by karatestu
Wed Feb 17, 2021 6:24 pm
Forum: DIY
Topic: Building a DIY amp with NVA amplifier boards
Replies: 346
Views: 199527
Great Britain

Re: Building a DIY amp with NVA amplifier boards

I have got the latest version of my amplifier wired up and tested. Now have all six NVA boards in use and six remote PSU's. wiring still all over the place and the two 0V wires from the two added PSU's are joined on the bus bar half way between the two boards they power. Still absolutely zero hum :d...
by karatestu
Wed Feb 17, 2021 10:24 am
Forum: DIY
Topic: Doc modding Marantz imperial 7
Replies: 1932
Views: 410463
Great Britain

Re: Doc modding Marantz imperial 7

Stuck two litres worth of 3" square fence posts inside each 5" bipole speaker to try and bring up the bass a bit. And it has :dance: Still needs a bit more though :shock: I always thought with sealed box there was some leeway with box volume. Well there is but not this much :lol: It is ver...
by karatestu
Tue Feb 16, 2021 5:34 pm
Forum: DIY
Topic: Doc modding Marantz imperial 7
Replies: 1932
Views: 410463
Great Britain

Re: Doc modding Marantz imperial 7

Swapped in my bipolar 30cm cubes with 5.25" drivers for a listen. Even when bipolar and up to the wall they are very very slighty bass shy. The enclosure is slightly too big. Need to put a small bag of sand inside each one and see if that brings the bass up. I can't get them any closer to the w...
by karatestu
Tue Feb 16, 2021 3:50 pm
Forum: DIY
Topic: Doc modding Marantz imperial 7
Replies: 1932
Views: 410463
Great Britain

Re: Doc modding Marantz imperial 7

More faffing about here. The good thing is that now the high pass filter is before the power amp I don't need to change capacitors when trying different things. I changed the polystyrene caps that I am using for the line level high pass filter for a larger value and that worked out really well. In f...