Jeff Bagby Fusion - 8 Alchemy MTM Question

[kevin007]

Jeff,

My son Josh has been wanting to build the Dayton 8 now for about an year. I was looking at the Fusion 8 MTM and thought that it might be a better option as it is far more sensitive.

Could the fusion 8 MTM be built in a much larger cabinet and be tuned lower then it is now? I know it would require the crossover to be redesigned, and wanted to see if you would consider doing it.

Josh is your typical teenager and would love to have a pair of skull crushing speakers to blow the roof off the house.

Thanks in advance for your input!

Kevin

[Adam_G]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

Jeff,

My son Josh has been wanting to build the Dayton 8 now for about an year. I was looking at the Fusion 8 MTM and thought that it might be a better option as it is far more sensitive.

Could the fusion 8 MTM be built in a much larger cabinet and be tuned lower then it is now? I know it would require the crossover to be redesigned, and wanted to see if you would consider doing it.

Josh is your typical teenager and would love to have a pair of skull crushing speakers to blow the roof off the house.

Thanks in advance for your input!

Kevin

My recommendation is to build/buy a sub to pair with it, saves on distortion, gets louder and lower. Just my .02 .

[kevin007]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

My son already has 5 subs. We are covered!

Kevin

[dld]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

007,
If he's got 5 subs, why does he/you need to tune the mains lower? If you don't change the baffle dimensions significantly there is no need to change the crossover, typically.

[kevin007]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

It's because of his love of the Dayton 8's. He really wants a pair of huge skull crushing speakers. I was just thinking that it would not take much to power the fusion 8 MTM because it was so sensitive. The Dayton 8's are not very sensitive so their power requirements are a lot more.

Or maybe building a speaker within a cabinet would work? But I was just contemplating the options...

Kevin

007,
If he's got 5 subs, why does he/you need to tune the mains lower? If you don't change the baffle dimensions significantly there is no need to change the crossover, typically.

[Jeff B.]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

Jeff,

My son Josh has been wanting to build the Dayton 8 now for about an year. I was looking at the Fusion 8 MTM and thought that it might be a better option as it is far more sensitive.

Could the fusion 8 MTM be built in a much larger cabinet and be tuned lower then it is now? I know it would require the crossover to be redesigned, and wanted to see if you would consider doing it.

Josh is your typical teenager and would love to have a pair of skull crushing speakers to blow the roof off the house.

Thanks in advance for your input!

Kevin

Well, the Beta8 is capable of a bit more more extension. If you built the MTM in a tower that was 2 cu ft and tuned to 56Hz (could be achieved with 2 - 3" diameter ports x 4" long) then it would extend to an F3 of 51Hz and a F6 of 46 hz. If you keep the baffle the same width the original crossover will likely work fine. But you need to keep in mind that this woofer has an Xmax of 3mm, so pushing the bass for maximum extension may not be the best idea.

If he really wants crushing sound, that still sounds really good, then get him a pair of the Tempest kits. They have very linear response, 98dB sensitivity, and a very easy 8 ohm minimum impedance to drive, and in a living room with a good amp and multiple subs will sound like a rock concert.

Jeff

[kevin007]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

Jeff,

Does Erich still have the tempest kits? I see the Karma, Fusion, and Alpha kits but none of the tempest.

My other idea was to build the cabinet into a larger cabinet. It would look like the giant Dayton 8's but the internal volume of the speaker cab would be the same as the kit.

What do you think?

Kevin

Well, the Beta8 is capable of a bit more more extension. If you built the MTM in a tower that was 2 cu ft and tuned to 56Hz (could be achieved with 2 - 3" diameter ports x 4" long) then it would extend to an F3 of 51Hz and a F6 of 46 hz. If you keep the baffle the same width the original crossover will likely work fine. But you need to keep in mind that this woofer has an Xmax of 3mm, so pushing the bass for maximum extension may not be the best idea.

If he really wants crushing sound, that still sounds really good, then get him a pair of the Tempest kits. They have very linear response, 98dB sensitivity, and a very easy 8 ohm minimum impedance to drive, and in a living room with a good amp and multiple subs will sound like a rock concert.

Jeff

[Jeff B.]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

Jeff,

Does Erich still have the tempest kits? I see the Karma, Fusion, and Alpha kits but none of the tempest.

My other idea was to build the cabinet into a larger cabinet. It would look like the giant Dayton 8's but the internal volume of the speaker cab would be the same as the kit.

What do you think?

Kevin

The Tempest is the Fusion-12:

http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-series-kits/fusion12-kit.html

Other than that, I guess I don't really understand this thread, so I am not sure how to assist any further. I reckon I have no idea what the "Dayton 8" is, or how it relates to the Alchemy MTM.

Jeff

[blur]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

It relates to the fusion in that they are both similar sizes and high output. Also here's a link for you http://www.angelfire.com/music5/audio0/

[Jeff B.]

Re: Jeff Bagby Fusion - 8 Alchemy MTM Question

It relates to the fusion in that they are both similar sizes and high output. Also here's a link for you http://www.angelfire.com/music5/audio0/

Thanks, I was unfamiliar with that speaker. It's bigger than the Alchemy and likely extends deeper in the bass too. The Alchemy will be several dB more sensitive though. It's all in Hoffman's trade-offs. The crossover in the Dayton 8 concerns me though, it indicates that there isn't much, if any, baffle step compensation. I would expect the two speakers have a different tonal balance.