I am thinking of building new enclosures for a pair of Trusonic 120FR and 5Kt speakers. Originaly they were in the diy Jensen bass reflex corner cabinets with sherwood SX36 crossovers. In a relocation I left the cabinets behind and kept the speakers. built in 1960 maybe there is a better enclosure option than bass reflex, after 30 years of listening I felt the bass was overpowering, although I enjoyed them when I was young. The Crossovers need to be replaced, passive or powered? I like the idea of the Pass diy store powered crossover, although I also like the simplicity of a passive unit Space is an issue, so I'm looking for something with a small footprint, height is not a problem. Any response will be appreciated.
T/S parameters is what Planet10 was asking about. I would guess no.. 😀
https://en.wikipedia.org/wiki/Thiele/Small_parameters
https://en.wikipedia.org/wiki/Thiele/Small_parameters
I know the 120Fr has Impedance:16ohms. Frequency response 30-15000 cycles per second. Free air resonance: 40 cycles per second. Power rating 30 watts program; 60 watt peaks
The 5Kt tweeter is for use above 5000cps in a two way or three-way system. Frequency response 5000-25,000 cps. It is a Toroid design aluminum horn.
The only mention of transient response is for the 120Fr "excellent transient response" no figures or graphs.
I was just reading the spec. sheet and Stephens recommends the Bass-Plane enclosure for optimum results.
The 5Kt tweeter is for use above 5000cps in a two way or three-way system. Frequency response 5000-25,000 cps. It is a Toroid design aluminum horn.
The only mention of transient response is for the 120Fr "excellent transient response" no figures or graphs.
I was just reading the spec. sheet and Stephens recommends the Bass-Plane enclosure for optimum results.
Without some data, which can be measured (sorta), you’ll just be on a trail of guesses each successive one hopefully imformed by what did and didn’t work on the previous guess.
First guess shoud probably be informed by how it was used in the past. ie BIG
Might i suggest getting 2 sheets of quality plywood. Cut a hole for the driver of appropriate hesight and mirror imaged. Support upright and see how they sound. Depending on how thta goes you might decide to use the bedroom next as a box ie mount drivers in the wall.
GM?
dave
First guess shoud probably be informed by how it was used in the past. ie BIG
Might i suggest getting 2 sheets of quality plywood. Cut a hole for the driver of appropriate hesight and mirror imaged. Support upright and see how they sound. Depending on how thta goes you might decide to use the bedroom next as a box ie mount drivers in the wall.
Anyhing like that will be either a half-wave resonator (closed, or holes at both ends), or quarter-wave (open at one end). Given that this size box (athou my “small footprint” might not be yours) is unlikely to be large enuff we can expand on the basik aperiodic recipe, “make the box as big as you can live with and make it as aperiodic as you can”. We can then take advantage of the length to make it an aperiodic labyrinth.
GM?
dave
As always pictures would help.
Of the whole original box if it existed and of the individual drivers, any internal electronics etc:
Would these be; by any chance' the boxes designed by Eames or a smaller box?
I have found an old AudioKarma article
https://audiokarma.org/forums/index...-example-of-audio-karma-at-its-finest.708358/
Of the whole original box if it existed and of the individual drivers, any internal electronics etc:
Would these be; by any chance' the boxes designed by Eames or a smaller box?
I have found an old AudioKarma article
https://audiokarma.org/forums/index...-example-of-audio-karma-at-its-finest.708358/
Measured 1976, I forget the magazine:
73.9"^2/476.77 cm^2 Sd
403.34 L Vas
29.2 Fs
7.1 Re
0.53 Le
1.336 Qts!
So pretty safe to say its AlNiCo magnet needed some serious draining/zapping, rendering Fs, Vas, Qts invalid to a more or lessor extent
Measured 2012 by a DIYer:
7.5 ft^3/212.38 L Vas
37 Hz Fs
0.56 Qts
Best to measure yours of course, otherwise if not trying another original cab design, then personally would cobble together the pioneer's classic BR = Vas/1.44 Vb = ~5.21 ft^3 net, Fb = Fs tuned with a 5" dia. pipe and if still too 'boomy', then critically damp the vent.
73.9"^2/476.77 cm^2 Sd
403.34 L Vas
29.2 Fs
7.1 Re
0.53 Le
1.336 Qts!
So pretty safe to say its AlNiCo magnet needed some serious draining/zapping, rendering Fs, Vas, Qts invalid to a more or lessor extent
Measured 2012 by a DIYer:
7.5 ft^3/212.38 L Vas
37 Hz Fs
0.56 Qts
Best to measure yours of course, otherwise if not trying another original cab design, then personally would cobble together the pioneer's classic BR = Vas/1.44 Vb = ~5.21 ft^3 net, Fb = Fs tuned with a 5" dia. pipe and if still too 'boomy', then critically damp the vent.