Completely lost on HT amps with no, or low high pass.

Is this amp OK?
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Absynthe
Posts: 17
Joined: Thu Jan 02, 2014 9:10 pm
Location: NE Georgia

Completely lost on HT amps with no, or low high pass.

#1 Post by Absynthe »

Building a pair of THT's with the recommended drivers. Looking for a plate amp to drive them both but after reading through every amp post on this forum I see that they all seem to filter below a certain freq. I called PE and support said the SPA500 filter is set to 18hz, but their documentation states 30hz. On the other hand lots of folks on this board are using BASH 300 and 500, as well as the Dayton amps with success. The O Audio with variable high pass doesnt seem to be available any longer. Sooo, to use the low end freq the THT can produce, what's a suggestion for an amp to drive two of these these?

sine143
Posts: 3066
Joined: Sat Feb 06, 2010 3:27 pm
Location: Raleigh NC

Re: Completely lost on HT amps with no, or low high pass.

#2 Post by sine143 »

the tht doesnt do anything below 20. the bash amps (with their filter at about 18hz) are perfect because they actually help protect against over excursion below horn cutoff.

I'd recomend a non plate amp anyways though. If using the dayton DVC (par wired for 4 ohm load) the Behringer Inuke 1000 dsp is a nice fit (at 300 w per channel at 4 ohms), and adustable dsp options/ limiters.
Built:
2x Tuba 30s delta12lf loaded (gone)
4x Otop12 d2512 loaded
8x t48s (18, 18, 24, 24, 30, 30) 3015lf loaded
2x AT (1 mcm, 1 gto 804)
2x SLA Pro (dayton pa6, 6 goldwood piezo loaded)
1x bastard XF208

2x OT212 (delta pro 450a loaded, eminence psd)

Absynthe
Posts: 17
Joined: Thu Jan 02, 2014 9:10 pm
Location: NE Georgia

Re: Completely lost on HT amps with no, or low high pass.

#3 Post by Absynthe »

I'll look into that. My Denon amp has DSP, could I get away with the nonDSP amp, or are there more settings there I'd be missing?

sine143
Posts: 3066
Joined: Sat Feb 06, 2010 3:27 pm
Location: Raleigh NC

Re: Completely lost on HT amps with no, or low high pass.

#4 Post by sine143 »

eh, if your denon has dsp (and can apply a couple bands of paremetric eq, and a hipass/lopass) then get a non dsp amp.
Built:
2x Tuba 30s delta12lf loaded (gone)
4x Otop12 d2512 loaded
8x t48s (18, 18, 24, 24, 30, 30) 3015lf loaded
2x AT (1 mcm, 1 gto 804)
2x SLA Pro (dayton pa6, 6 goldwood piezo loaded)
1x bastard XF208

2x OT212 (delta pro 450a loaded, eminence psd)

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Bill Fitzmaurice
Site Admin
Posts: 28620
Joined: Tue May 02, 2006 5:59 pm

Re: Completely lost on HT amps with no, or low high pass.

#5 Post by Bill Fitzmaurice »

sine143 wrote:the tht doesnt do anything below 20. the bash amps (with their filter at about 18hz) are perfect because they actually help protect against over excursion below horn cutoff.
THT does not need high passing, as the excursion is at a maximum at 22Hz, and drops below that.

sine143
Posts: 3066
Joined: Sat Feb 06, 2010 3:27 pm
Location: Raleigh NC

Re: Completely lost on HT amps with no, or low high pass.

#6 Post by sine143 »

Bill Fitzmaurice wrote:
sine143 wrote:the tht doesnt do anything below 20. the bash amps (with their filter at about 18hz) are perfect because they actually help protect against over excursion below horn cutoff.
THT does not need high passing, as the excursion is at a maximum at 22Hz, and drops below that.

i stand corrected!
Built:
2x Tuba 30s delta12lf loaded (gone)
4x Otop12 d2512 loaded
8x t48s (18, 18, 24, 24, 30, 30) 3015lf loaded
2x AT (1 mcm, 1 gto 804)
2x SLA Pro (dayton pa6, 6 goldwood piezo loaded)
1x bastard XF208

2x OT212 (delta pro 450a loaded, eminence psd)

User avatar
Bill Fitzmaurice
Site Admin
Posts: 28620
Joined: Tue May 02, 2006 5:59 pm

Re: Completely lost on HT amps with no, or low high pass.

#7 Post by Bill Fitzmaurice »

sine143 wrote:
Bill Fitzmaurice wrote:
sine143 wrote:the tht doesnt do anything below 20. the bash amps (with their filter at about 18hz) are perfect because they actually help protect against over excursion below horn cutoff.
THT does not need high passing, as the excursion is at a maximum at 22Hz, and drops below that.

i stand corrected!
That doesn't mean that a high pass has no value, as there's no point sending signal below the pass band to the speaker, nor is there any point having the amp producing it. But it doesn't specifically need it for excursion limiting.

bossman
Posts: 185
Joined: Sat Dec 20, 2008 6:42 pm
Location: New York

Re: Completely lost on HT amps with no, or low high pass.

#8 Post by bossman »

You might want to look at the Yung 500 watt plate amps. They are on sale at Parts Express now. I just picked one up - haven't used it yet though.
2x HL10c Table Tubas
9/12 TLAHs

Absynthe
Posts: 17
Joined: Thu Jan 02, 2014 9:10 pm
Location: NE Georgia

Re: Completely lost on HT amps with no, or low high pass.

#9 Post by Absynthe »

Looks like I have a line on crown amps, and plan on getting the xls 1000. On one hand it is complete overkill for two THT's, but for the price I am roughly at the same as 2 plate amps.

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