Hi
I´m planning to build a tall and thin tower speaker, I like that design.
My intension is to make it so thin as possible, 10 litres, 3,5mm port 10cm long.
If I "stay" in the recommended measurements (litres) from this site 4" bas/mid - Monacor SPH-100C
Does the design of the enclosure matter to the bass?
The inner dimensions of the enclosure: 1200mm X 140mm X 60mm
I´m going to use this drivers:
4" bas/mid - Monacor SPH-100C
1" diskant - Monacor DT-25N
Mats from Sweden
I´m planning to build a tall and thin tower speaker, I like that design.
My intension is to make it so thin as possible, 10 litres, 3,5mm port 10cm long.
If I "stay" in the recommended measurements (litres) from this site 4" bas/mid - Monacor SPH-100C
Does the design of the enclosure matter to the bass?
The inner dimensions of the enclosure: 1200mm X 140mm X 60mm
I´m going to use this drivers:
4" bas/mid - Monacor SPH-100C
1" diskant - Monacor DT-25N
Mats from Sweden
The bass wants an enclosure of that size, any shape, but if your box becomes very long compared to wide, ie: it becomes like a pipe then you may have problems. Think about the frequency where the box height equals one quarter of a wavelength, remembering that low frequencies are harder to damp.
You'll also have to deal with the baffle, where most of your sound is given away at the edges of a narrow cabinet. The frequency where this happens is in the midrange or lower treble where ears are sensitive. There can be response changes around here and plenty of sound to get involved in room reflections.
You'll also have to deal with the baffle, where most of your sound is given away at the edges of a narrow cabinet. The frequency where this happens is in the midrange or lower treble where ears are sensitive. There can be response changes around here and plenty of sound to get involved in room reflections.
Hi Mats,
Tall-and-Narrow Options:
3-way FULL RANGE?
2-way transmission line?
2-way ported box?
Some tall-and-narrow 3-way speakers produce FULL RANGE sound by using a pair of side mounted woofers. The Audio Physic speakers are one example of 1" dome + 5" midbass + side-side woofers for counter-force vibration reduction. Sharp cabinet edges generate audible diffraction distortion, and a 1-1.5" radius routed quater round curve is often used, and naturally this increases cabinet width.
Some tall-and-narrow 2-way speakers produce EXTENDED BASS from a transmission line construction. The MLTL = Mass_Loaded_Transmission_Line bass cabinet is perhaps the most common. A -3db bass frequency between 0.8*Fs and Fs can be achieved. Box dimensions are calculated from the speakers T/S parameters such that the tall cabinet plus stuffing resonates near 1/4 the wavelength of the bass_port_tuning, and this resonant energy overcomes the air mass in the port tube and pumps out EXTENDED BASS. There are good tools to calculate MLTL cabinet dimensions for the Monacor SPH-100C. Folks here can help with box design.
Worth a read:
Quarter Wavelength Loudspeaker Design
Some tall-and-narrow 2-way speakers produce reasonable bass from a basic ported cabinet, where only the total internal volume and the port area+depth must be observed. Methods to reduce cabinet vibration and resonances from standing waves can improve the sound. Golden ratios... bracing... stuffing.... etc... I can run ported box calculations for the Monacor SPH-100C if you need help.
Tall-and-Narrow Options:
3-way FULL RANGE?
2-way transmission line?
2-way ported box?
Some tall-and-narrow 3-way speakers produce FULL RANGE sound by using a pair of side mounted woofers. The Audio Physic speakers are one example of 1" dome + 5" midbass + side-side woofers for counter-force vibration reduction. Sharp cabinet edges generate audible diffraction distortion, and a 1-1.5" radius routed quater round curve is often used, and naturally this increases cabinet width.
Some tall-and-narrow 2-way speakers produce EXTENDED BASS from a transmission line construction. The MLTL = Mass_Loaded_Transmission_Line bass cabinet is perhaps the most common. A -3db bass frequency between 0.8*Fs and Fs can be achieved. Box dimensions are calculated from the speakers T/S parameters such that the tall cabinet plus stuffing resonates near 1/4 the wavelength of the bass_port_tuning, and this resonant energy overcomes the air mass in the port tube and pumps out EXTENDED BASS. There are good tools to calculate MLTL cabinet dimensions for the Monacor SPH-100C. Folks here can help with box design.
Worth a read:
Quarter Wavelength Loudspeaker Design
Some tall-and-narrow 2-way speakers produce reasonable bass from a basic ported cabinet, where only the total internal volume and the port area+depth must be observed. Methods to reduce cabinet vibration and resonances from standing waves can improve the sound. Golden ratios... bracing... stuffing.... etc... I can run ported box calculations for the Monacor SPH-100C if you need help.
Attachments
A 2-way, but otherwise fits the description.
uFonkenSET w FF85wKeN active XO at 240 Hz to 2 Peerless 830870 in an ML-TL. These work really well.
dave
A 2-way, but otherwise fits the description.
uFonkenSET w FF85wKeN active XO at 240 Hz to 2 Peerless 830870 in an ML-TL. These work really well.
dave
They look very nice! 🙂
I saw this; Jim Griffin´s Aura T-Line... looks very nice.
What do you think about the frequency range?
Jim Griffin's Aura T-line 2-way
What do you think about the frequency range?
Jim Griffin's Aura T-line 2-way
4" bass/mid - Monacor SPH-100C
inner dimensions: 1200mm X 140mm X 60mm
10 litres, 3.5cm port 10cm long
A 10 liter internal volume will get reduced by the volume of the two speakers and some bracing.
The website T/S parameters for the Monacor SPH-100C model a Butterworth alignment with 8.2l volume tuned to 45Hz using a 3.5cm diameter port 14.5cm long. A deeper(>60mm since speaker is 50mm) box would help reduce rear cone reflections and allow adequate room for rear absorption material.
The website T/S parameters for the Monacor SPH-100C model a modest bass shelf alignment with 10l volume tuned to 41Hz using a 3.5cm diameter port 14.5cm long. Room bass gain from walls would add to the bass shelf and likely produce modestly flat SPLs, so this is also a good option.
==========
Since the SPH-100C covers up to the 1.5-2Khz tweeter, using a full range Transmission Line Simulator illustrates that the 1200mm X 140mm X 60mm box generates internal resonances, which proper cross bracing and on-wall absorption material can help to reduce. Transmission lines(and MLTL) tune the rear air exit path dimensions and box stuffing to reduce these resonances with good bass-gain and modest internal reflections. A deeper(>60mm since speaker is 50mm) box, with calculated placement of the speaker and port are necessary for a TL(MLTL) design. Folks here can help.
inner dimensions: 1200mm X 140mm X 60mm
10 litres, 3.5cm port 10cm long
A 10 liter internal volume will get reduced by the volume of the two speakers and some bracing.
The website T/S parameters for the Monacor SPH-100C model a Butterworth alignment with 8.2l volume tuned to 45Hz using a 3.5cm diameter port 14.5cm long. A deeper(>60mm since speaker is 50mm) box would help reduce rear cone reflections and allow adequate room for rear absorption material.
The website T/S parameters for the Monacor SPH-100C model a modest bass shelf alignment with 10l volume tuned to 41Hz using a 3.5cm diameter port 14.5cm long. Room bass gain from walls would add to the bass shelf and likely produce modestly flat SPLs, so this is also a good option.
==========
Since the SPH-100C covers up to the 1.5-2Khz tweeter, using a full range Transmission Line Simulator illustrates that the 1200mm X 140mm X 60mm box generates internal resonances, which proper cross bracing and on-wall absorption material can help to reduce. Transmission lines(and MLTL) tune the rear air exit path dimensions and box stuffing to reduce these resonances with good bass-gain and modest internal reflections. A deeper(>60mm since speaker is 50mm) box, with calculated placement of the speaker and port are necessary for a TL(MLTL) design. Folks here can help.
Attachments
I didn't see a sim that gives an idea of the LF extension, but the Aura is one of the most bass capable 3" drivers available and an ML-TL has the potential to extract the most outof them. Its issues are in the highest frequencies, the tweeter would hopefully make that a no care. The smal size of the drivers means that one is getting closer to the desired 1/4 wavelength centre to centre separation at the XO point.
dave
Thank you guys. I´m totally novice ;-)
But I´m try to find out to build a tall and thin 2-way speaker because I like that design, and it would fit in very well in the living room. Do you have som plans or blueprint I can use?
I really like the shape of the T-L, the Jim Griffin, the Lancetta and the Cyborgs needle looks avesome.
But I´m try to find out to build a tall and thin 2-way speaker because I like that design, and it would fit in very well in the living room. Do you have som plans or blueprint I can use?
I really like the shape of the T-L, the Jim Griffin, the Lancetta and the Cyborgs needle looks avesome.
I have not been following this thread so I will use that as my excuse for being late to the party. My Aura NS3 MTM MLTL design has an F3 down frequency of approximately 40 Hz so it produces excellent bass for its size. Those small cones can really move when you play music with low bass notes.
I searched for my Martin J. King simulation sheets this evening but I did not locate my analysis. Now that work is nearly ten years old at this point. If it is a deal breaker to not have a performance plot, I can rerun the simulation and reproduce my results. The other concern is to know the published or better yet the measured T/S specs for the current production Aura drivers. In that case the sim would be representative of what you could achieve.
The reference you cited earlier has drawings for the enclosure so plans are out there for my design at:
http://techtalk.parts-express.com/s...Griffin-s-Aura-T-line-2-way&highlight=Griffin
Jim
I searched for my Martin J. King simulation sheets this evening but I did not locate my analysis. Now that work is nearly ten years old at this point. If it is a deal breaker to not have a performance plot, I can rerun the simulation and reproduce my results. The other concern is to know the published or better yet the measured T/S specs for the current production Aura drivers. In that case the sim would be representative of what you could achieve.
The reference you cited earlier has drawings for the enclosure so plans are out there for my design at:
http://techtalk.parts-express.com/s...Griffin-s-Aura-T-line-2-way&highlight=Griffin
Jim
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