Hi All,
I am looking for a suitable 8 inch midwoofer for use in a MTM (Midbass-tweeter-Midbass) 2 way floorstander project. Tweeter used will either be a Peerless HDS (93dB/w) or Wavecor silkdome tweeter TWA05 with ferrofluid(91dB). Crossover point is at 1500Hz, 4th order acoustic Linkwitz-Riley. One woofer that I feel is suitable for the task is a
Scanspeak 21W8554. It is an old driver but Linkwitz has used it as a MTM for his
Pheonix dipole project and seems to regard it as a great midrange. The driver has an efficiency of 90dB, so if i parallel it with the second woofer, electrically I would get 96dB/watt, but in reality I will achieve around 93dB/watt right?
Greatly appreciate any other suggestions and experiences of anyone who has built a 2 way MTM with 8'' woofers. Assuming that I will be designing my own crossovers :
Goals for the project :
1. Sensitivity of at least 93dB/watt/m in the 50-2000Hz range
2. Simplicity of a 2 way crossover
3. Powerful and deep bass ; F3 of 30Hz in room.
4. Highly dynamic sound and can easily be powered by (5-10) low watt SS/valve amps at 2meter
listening distance.
You may be wondering why use an 8'' for the midrange? Most of the 2 ways I have built using 6.5inch midwoofers don't sound as dynamic as a single 8''. Also they cannot achieve the required efficiency in a MTM format. I could go with multiple 6.5inch drivers to get a higher sensitivity but they still cannot go as deep as a single 8''. A larger driver just has that sense of ease when played loudly. Totally free of compression when compared with the smaller 6.5inch. (assuming drivers of similar quality are used.) Also, I would like to avoid a 3 way due to complexities with crossover and since I already have a sub to complement the 15-35Hz region. Thoughts anyone?
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