Doc modding Marantz imperial 7

[karatestu]

The madness has crept south
Your ‘blog’ gets my imagination going



May connect the 12” what eh!

Your cab has grown and developed a boil on top I am glad my "blog" has been of some use.

Are you going to put some foam or something in the gaps to give some resistance to the back wave ? Or seal them off with wood ?

[karatestu]

Next thing i am going to do is put more foam in the back to increase it's thickness. See what effect that has. I don't want it to remove the immediacy that is present when you have a sealed box with no stuffing.

I was thinking that if the backwave is reduced in volume enough and delayed in time very slightly by the foam then maybe i have a passive cardioid bass system ?

[karatestu]

The postman brought a package this morning. The two 5.25 " drivers have arrived

Merry Christmas to me

[karatestu]

I heard and had a play with a B&O Beosound 2 yesterday at my sisters. I quite liked it

https://www.bang-olufsen.com/en/spe ... al-eu

[Latteman]

Oh no- I can hear the cogs ticking from here

[karatestu]

Oh no- I can hear the cogs ticking from here

Don't worry, it hasn't changed what i am going to do.

It sounded very detailed and the bass was obviouly eq'd. Files were sent through wifi or blue tooth, can't remember

It is very small and there is only one speaker. I could fit about ten of them inside my bass cab No stereo effects which is a bit odd. Curtailed dynamics if you ask me. There was no scale - it is very small. No trouser flapping with them. You can not feel the music if you know what i mean. They wouldn't satisfy long term.

But........for a second system or casual listening i could happily live with one.

[CN211276]

Seems rather expensive for what it is. I have a Bose Mini Soundlink which I alwaye take away with me. Cost less than £200 and the sound is decent.

[karatestu]

Seems rather expensive for what it is. I have a Bose Mini Soundlink which I alwaye take away with me. Cost less than £200 and the sound is decent.

£1,600 ?? Yes i would say it is but aren't all these lifestyle products ?

It did sound the same where ever you sat or stood in the room which i liked a lot.

[CN211276]

Seems rather expensive for what it is. I have a Bose Mini Soundlink which I alwaye take away with me. Cost less than £200 and the sound is decent.

£1,600 ?? Yes i would say it is but aren't all these lifestyle products ?

It did sound the same where ever you sat or stood in the room which i liked a lot.

Still a lot cheaper than Linn's Bluetooth device.

[karatestu]

I am now of the opinion that the bass cabs with a back panel of foam may be some kind of crude passive cardioid. There is tuning to do of course if no dsp is used with it. Amount of foam, distance between front and back of the driver, size of opening at the back of the cabinet.

Anyway, what use are words to describe what it is. Why should it have to be compartmentalised or pigeon holed. Cardioid is a bullshitters buzz word on forums at the moment with lots of peeps raving on about it. If i manage to perfect the rear panel of foam approach and like it more than true sealed box with no stuffing then i will continue with it. If not then back to ffing about with aperiodic.

With the fear of disappearing up my own arse i am going to stop using words like cardioid, aperiodic etc. What it is makes no difference to anybody, what it sounds like is a different matter . I also am aware that i have been on a bit of an enclosure reduction crusade Nothing wrong with that i guess as long as the performance is not audibly compromised .

Ways to reduce box volume;

Use different drivers with lower Vas - not gonna happen
Put up with overblown bass - not going to happen
Use two drivers in isobaric loading - yes, yes, yes
Design a hole in the back of the cab with foam in it or other resistive material - yes worthy of investigation
Enclosure with a foam back panel - yes, worthy of investigation
Complete open baffle or no baffle - yes, worthy of investigation but probably impractical for true dipole due to distance to back wall requirement
Hartley Boffle - not sure about this. Its basically a resistive back panel with internal curtains