I have the Def Tech BP8080ST and the woofer/sub will play with speaker wire or it turns on the internal amp to drive them if you use the LFE. The internal amp is much cleaner bass than using a receiver to push it.
The amps in your 8080’s, much like every amp in Def Tech towers from the Pro Tower 400’s from 15 years ago to the BP3000’s to the 9080’s, power only the subwoofer driver(s) regardless if you connect them via speaker level or line level. The midrange and tweeter arrays are always powered by your receiver or power amps but the subwoofer drivers never are. The Def Tech’s crossover will send the appropriate frequencies to the powered subs without using the LFE input. Most full range speaker manufacturers suggest this as the loudspeaker is now receiving a full range signal and can make more use of its passive crossover which was specifically engineered for it as opposed to using your AVR or Pre/Pro’s crossovers. My Snell XA-90PS full range towers have usable output down to 21hz in my specific room using the 4 in tower subs and they sound exponentially better ran as “large.” The Snell’s have hand made and tuned crossovers that are calibrated to within 0.5dB of the crossover frequencies, the PCB alone is 6” wide and 20” long and uses quality components.
DM70 would be best crossed over no lower than 60hz (for various reasons) and depending upon placement/the room (as Joe was indicating) they may be better off crossed over even higher (70, 75, or 80). Don't feel bad if it turns out to be 80hz and you are feeling like "Man, and I bought towers". The crossover between the 10" active and the 5.25 mid-range is likely around 120hz/180hz/200hz.... giving the single 10" driver plenty to do... and better still will now never run out of headroom and will be able to keep up with the dual Monolith THX 15 Subwoofers. Moving to Bookshelf speakers as was suggested would be a terrible idea... for no stick'n bookshelf (even crossed over at 80hz) can keep up with dual 15" and/or bass down to 80hz with a 12 dB rolloff (Well, not at Blockbuster Movie volumes that is). So IMO you made a good choice and you now need to work on setup/integration 👍. Ps. of course if one doesn't ever listen at Blockbuster Movie volumes and their Music also never rock-out, then sure one can 'get a way with' a Bookshelf speaker (that just isn't me I'm afraid). -OR- at least insure that your Bookshelf speaker is say rocking Dual 5.25/6/6.5 woofers... and then an 80hz crossover can just about work (still not good enough / loud enough for me, however very doable for many).
Exactly, although a THX speaker whether a tower or a bookshelf roll of at ~80Hz. And I think my monolith mini towers (glorified bookshelf speakers) can keep up with my dual 16" monoliths.
@@HTtimperry Yes, one of the few Bookshelf (mini-towers) that can do an 80 hz crossover justice. Dual 6.5" woofers make all the difference in the world, whereas a single 6.5" woofer simply cannot. Ps. I owned them as well - THX 356T.
I have the Def Tech BP8080ST and the woofer/sub will play with speaker wire or it turns on the internal amp to drive them if you use the LFE. The internal amp is much cleaner bass than using a receiver to push it.
The amps in your 8080’s, much like every amp in Def Tech towers from the Pro Tower 400’s from 15 years ago to the BP3000’s to the 9080’s, power only the subwoofer driver(s) regardless if you connect them via speaker level or line level. The midrange and tweeter arrays are always powered by your receiver or power amps but the subwoofer drivers never are. The Def Tech’s crossover will send the appropriate frequencies to the powered subs without using the LFE input. Most full range speaker manufacturers suggest this as the loudspeaker is now receiving a full range signal and can make more use of its passive crossover which was specifically engineered for it as opposed to using your AVR or Pre/Pro’s crossovers. My Snell XA-90PS full range towers have usable output down to 21hz in my specific room using the 4 in tower subs and they sound exponentially better ran as “large.” The Snell’s have hand made and tuned crossovers that are calibrated to within 0.5dB of the crossover frequencies, the PCB alone is 6” wide and 20” long and uses quality components.
DM70 would be best crossed over no lower than 60hz (for various reasons) and depending upon placement/the room (as Joe was indicating) they may be better off crossed over even higher (70, 75, or 80). Don't feel bad if it turns out to be 80hz and you are feeling like "Man, and I bought towers". The crossover between the 10" active and the 5.25 mid-range is likely around 120hz/180hz/200hz.... giving the single 10" driver plenty to do... and better still will now never run out of headroom and will be able to keep up with the dual Monolith THX 15 Subwoofers. Moving to Bookshelf speakers as was suggested would be a terrible idea... for no stick'n bookshelf (even crossed over at 80hz) can keep up with dual 15" and/or bass down to 80hz with a 12 dB rolloff (Well, not at Blockbuster Movie volumes that is). So IMO you made a good choice and you now need to work on setup/integration 👍. Ps. of course if one doesn't ever listen at Blockbuster Movie volumes and their Music also never rock-out, then sure one can 'get a way with' a Bookshelf speaker (that just isn't me I'm afraid). -OR- at least insure that your Bookshelf speaker is say rocking Dual 5.25/6/6.5 woofers... and then an 80hz crossover can just about work (still not good enough / loud enough for me, however very doable for many).
Exactly, although a THX speaker whether a tower or a bookshelf roll of at ~80Hz. And I think my monolith mini towers (glorified bookshelf speakers) can keep up with my dual 16" monoliths.
@@HTtimperry Yes, one of the few Bookshelf (mini-towers) that can do an 80 hz crossover justice. Dual 6.5" woofers make all the difference in the world, whereas a single 6.5" woofer simply cannot. Ps. I owned them as well - THX 356T.
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